阅读说明：本技术 富氧富甲烷气气喷注单元地面筛选试验装置及试验方法 (Ground screening test device and test method for oxygen-enriched methane-rich gas injection unit ) 是由 李小平 肖虹 刘昭宇 薛帅杰 李悦 王焕燃 房喜荣 于 2021-08-30 设计创作，主要内容包括：本发明涉及一种液体火箭发动机地面试验装置及试验方法,具体涉及一种富氧富甲烷气气喷注单元地面筛选试验装置及试验方法,目的是为了解决现有技术采用的常温推进剂、地面试验装置及试验方法无法筛选出结构可靠、燃烧性能优的富氧富甲烷气气喷注单元的技术问题。富氧富甲烷气气喷注单元地面筛选试验装置包括富甲烷燃气发生器、富氧燃气发生器和气气喷注单元试验组件；采用一定温度、组分和压力的推进剂,相比常温推进剂可以较大程度模拟推力室中气气喷注单元燃烧特性；选取合适喉部直径的喉道降低试验件燃烧室室压,从而大幅降低高压试验的安全风险。基于上述装置,本发明还提供一种富氧富甲烷气气喷注单元地面筛选试验方法。(The invention relates to a liquid rocket engine ground test device and a test method, in particular to an oxygen-enriched methane-rich gas injection unit ground screening test device and a test method, and aims to solve the technical problem that an oxygen-enriched methane-rich gas injection unit with a reliable structure and excellent combustion performance cannot be screened by a normal-temperature propellant, a ground test device and a test method adopted in the prior art. The oxygen-enriched methane-enriched gas injection unit ground screening test device comprises a methane-enriched fuel gas generator, an oxygen-enriched fuel gas generator and a gas injection unit test component; the propellant with certain temperature, components and pressure is adopted, and compared with the normal-temperature propellant, the combustion characteristic of the gas injection unit in the thrust chamber can be simulated to a greater extent; and a throat with a proper throat diameter is selected to reduce the chamber pressure of the combustion chamber of the test piece, so that the safety risk of a high-pressure test is greatly reduced. Based on the device, the invention also provides a ground screening test method for the oxygen-enriched methane-rich gas injection unit.)

1. The utility model provides an oxygen boosting methane-rich gas spouts unit ground screening test device which characterized in that: comprises a methane-rich gas generator (4), an oxygen-rich gas generator (11) and a gas injection unit test component (25);

the methane-rich gas generator (4) comprises a methane-rich combustion chamber (26), a first throttling pore plate (5) and a first external connector (6) which are connected in sequence; a first igniter (1), a first methane gas inlet (2) and a first oxygen gas inlet (3) are respectively arranged on the left end head of the methane-rich combustion chamber (26);

the oxygen-enriched fuel gas generator (11) comprises an oxygen-enriched combustion chamber (27), a second orifice plate (10) and a second external interface (9) which are connected in sequence; a second igniter (13), a second methane inlet (12) and a second oxygen inlet (14) are respectively arranged on the right end head of the oxygen-enriched combustion chamber (27);

the gas injection unit test component (25) comprises a head part (7), a fixing flange (17), a body part (21) and a throat (22);

the head (7) comprises a main pipeline, a fuel inlet flange (28) and an oxidant inlet flange (29) which are arranged on the side part of the main pipeline, a fuel pre-injection pressure monitoring device (15) and an oxidant pre-injection pressure monitoring device (8) which are arranged on the main pipeline, an external flange (16) which is arranged at the gas output end of the main pipeline, and a head clapboard (31) which is arranged on the main pipeline and is positioned between the fuel inlet flange (28) and the oxidant inlet flange (29); wherein the fuel pre-injection pressure monitoring device (15) and the fuel inlet flange (28) are positioned at the lower side of the head partition plate (31) and are close to the fuel gas output end of the main pipeline, and the oxidant pre-injection pressure monitoring device (8) and the oxidant inlet flange (29) are positioned at the upper side of the head partition plate (31) and are far away from the fuel gas output end of the main pipeline;

a through hole matched with the outer diameter of the upper end of the gas injection unit test piece (32) is formed in the middle of the head partition plate (31);

a through hole matched with the outer diameter of the lower end of the gas injection unit test piece (32) is formed in an external flange (16) of the head (7); the external flange (16) is connected with the fixed flange (17) through bolts;

the methane-rich gas generator (4) is connected with a fuel inlet flange (28) of the head (7) through a first external connector (6); the oxygen-enriched gas generator (11) is connected with an oxidant inlet flange (29) of the head (7) through a second external connector (9);

a body part (21) and a throat (22) are sequentially arranged below the fixed flange (17), and a through hole is formed in the middle of the fixed flange (17);

the inner channel of the body part (21) is a test piece combustion chamber (30); a third igniter (18), a pulsating pressure monitoring device (19), a temperature monitoring device (20) and a chamber pressure monitoring device (23) are arranged on the side wall of the body part (21);

the body part (21) and the throat (22) are cooled by adopting a cooling scheme.

2. The oxygen-enriched methane-rich gas injection unit ground screening test device of claim 1, wherein: the number of the pulsating pressure monitoring devices (19), the temperature monitoring devices (20) and the chamber pressure monitoring devices (23) is one or more.

3. The oxygen-enriched methane-rich gas injection unit ground screening test device according to claim 1 or 2, wherein: the cooling scheme is a copper heat sink scheme or an interlayer cooling scheme.

4. The oxygen-enriched methane-rich gas injection unit ground screening test device of claim 3, wherein: the body part (21) and the throat (22) are sequentially arranged below the fixed flange (17) through a long screw column group (24); the long screw column group (24) successively passes through the throat (22) and the body (21), and the end part of the long screw column group is in threaded connection with the fixed flange (17).

5. A ground screening test method for an oxygen-enriched methane-rich gas injection unit is characterized in that the ground screening test device for the oxygen-enriched methane-rich gas injection unit is adopted according to any one of claims 1 to 4, and the method comprises the following steps:

1) assembling test piece head

According to the structural simulation principle, a plurality of gas injection unit test pieces (32) are respectively assembled with a main pipeline, a head partition plate (31), an external flange (16), a fuel inlet flange (28) and an oxidant inlet flange (29) of a plurality of heads (7) to form a plurality of test piece heads;

2) calculating methane oxygen flow

Analyzing the flow, temperature and components of the methane-rich gas and the oxygen-rich gas required by the test of the gas-gas injection unit test piece (32) according to the temperature and component simulation principle, and respectively obtaining the flow of methane and oxygen required by the organization combustion of the methane-rich gas generator (4) and the oxygen-rich gas generator (11) through thermodynamic calculation;

3) calculating the throat diameter of the throat (22)

Determining the chamber pressure of a test piece combustion chamber (30) according to a depressurization simulation principle, and calculating the throat diameter of a throat (22);

4) selecting and installing a first orifice plate (5) and a second orifice plate (10)

Determining the preset values of the chamber pressure of the methane-rich gas generator (4) and the oxygen-rich gas generator (11) by combining the chamber pressure of the test piece combustion chamber (30) determined in the step 3), and selecting a first throttle orifice plate (5) and a second throttle orifice plate (10) with proper pore diameters according to the flow and temperature parameters of the methane-rich gas and the oxygen-rich gas obtained in the step 2) and respectively installing the first throttle orifice plate and the second throttle orifice plate in the methane-rich gas generator (4) and the oxygen-rich gas generator (11);

5) selection of cooling scheme

Selecting a body part (21) and a throat (22) which are provided with a proper cooling scheme according to the temperature of the fuel gas and the test duration;

6) assembly test device

Connecting the head part, the fixing flange (17), the body part (21), the throat (22), the methane-rich gas generator (4) and the oxygen-rich gas generator (11) of one of the test pieces obtained in the step) 1, and checking each connecting part to ensure good sealing and no leakage;

7) start of monitoring

Opening an oxidant path before-spraying pressure monitoring device (8), a fuel path before-spraying pressure monitoring device (15), a pulsating pressure monitoring device (19), a temperature monitoring device (20) and a chamber pressure monitoring device (23), and starting monitoring data acquisition programs;

8) generating methane-rich fuel gas and oxygen-rich fuel gas

Supplying methane and oxygen with corresponding flow rates to the methane-rich combustion chamber (26) and the oxygen-enriched combustion chamber (27) according to the flow rates of the methane and the oxygen obtained in the step 2), and starting the first igniter (1) and the second igniter (13), wherein the methane and the oxygen are combusted in the methane-rich combustion chamber (26) and the oxygen-enriched combustion chamber (27) to respectively generate methane-rich fuel gas and oxygen-enriched fuel gas with required temperatures; establishing corresponding pressure in a methane-rich combustion chamber (26) according to the chamber pressure preset value determined in the step 4) under the action of a first throttling orifice plate (5), and then sequentially entering a head part (7) through a first external connector (6) and a fuel inlet flange (28); establishing corresponding pressure in the oxygen-enriched combustion chamber (27) according to the chamber pressure preset value determined in the step 4) under the action of a second throttling orifice plate (10), and then sequentially entering the head (7) through a second external interface (9) and an oxidant inlet flange (29);

9) ignition test of gas injection unit test piece (32)

The methane-rich gas and the oxygen-rich gas entering the head (7) are injected through a gas injection unit test piece (32), enter a test piece combustion chamber (30), are ignited through a third igniter (18), and are fully combusted in the test piece combustion chamber (30);

10) reading each monitoring data and storing records;

11) -removing the current trial head, replacing the other trial head obtained in step 1), and repeating step 6) -10) until all of the trial heads containing all of the gas injection unit trial (32) have been tested;

12) gas injection unit test piece (32) screening

And after all the gas injection unit test pieces (32) are tested, screening qualified gas injection unit test pieces (32) according to the obtained test data of the gas injection unit test pieces (32) in the head part of each test piece.

6. The oxygen-enriched methane-rich gas injection unit ground screening test method according to claim 5, characterized in that the specific operation method of step 1) is as follows: sequentially welding the upper end of the gas injection unit test piece (32) with the inner wall of the through hole in the head partition plate (31), the outer edge of the head partition plate (31) with the inner wall of the main pipeline of the head (7) and the inner wall of the through hole in the gas injection unit test piece (32) and the external flange (16), and checking each welding position after welding is finished to ensure that gas does not leak; finally, a fuel inlet flange (28) and an oxidant inlet flange (29) are assembled on the side of the main pipe of the head part (7).

Technical Field

The invention relates to a liquid rocket engine ground test device and a test method, in particular to an oxygen-enriched methane-rich gas injection unit ground screening test device and a test method.

Background

The full-flow afterburning cycle technology is an important development direction of the technology of the reusable liquid rocket engine in the 21 st century. The methane has the characteristics of easy manufacture, good reusability and the like, and is selected as an important propellant of a full-flow afterburning circulating rocket engine.

One difference between a liquid oxygen methane full-flow afterburning cycle engine and a traditional engine is that: in the thrust chamber, the fuel and the oxidant are high-temperature methane-rich gas (temperature 600-1200K, and CH)₄(g) Content (wt.)>50 percent of oxygen-enriched fuel gas and high-temperature oxygen-enriched fuel gas (the temperature is 400-1000K, O)₂(g) Content (wt.)>70%) and the two gases enter an injection combustion chamber to be mixed and combusted at a certain flow rate and a certain mixing ratio under the action of a gas injector, so that high-temperature and high-pressure gas is generated, energy conversion is completed, and driving force is generated.

The gas injection unit is the smallest combustion organization unit of the gas injector. Under the working state of the thrust chamber of the liquid oxygen methane full-flow afterburning cycle engine, the combustion chamber is in a high-pressure environment (the pressure value is more than or equal to 20 MPa), so the performance and the reliability of the thrust chamber are determined to a great extent by the design of the gas injection unit. Therefore, in the development process of the liquid oxygen methane full-flow afterburning cycle engine, a gas injection unit ignition test needs to be carried out, and a gas injection unit with a reliable structure and good combustion performance is screened out.

In the prior art, a normal-temperature propellant, an existing ground test device and a test method are usually adopted to carry out a screening test of an oxygen-enriched methane-rich gas injection unit, but the oxygen-enriched methane-rich gas injection unit cannot simulate the high chamber pressure of a liquid oxygen methane full-flow afterburning cycle engine thrust chamber in a real working state and the temperature and components of the propellant, so that the combustion characteristic difference of the gas injection unit is large; meanwhile, the high chamber pressure of the liquid oxygen methane engine thrust chamber is simulated in a ground test, the test difficulty is high, and the danger coefficient is large.

Disclosure of Invention

The invention aims to solve the technical problem that an oxygen-enriched methane-enriched gas injection unit with a reliable structure and excellent combustion performance cannot be screened out by a normal-temperature propellant, a ground test device and a test method adopted in the prior art, and provides the ground screening test device and the test method for the oxygen-enriched methane-enriched gas injection unit.

In order to achieve the above purpose, the technical solution provided by the present invention is as follows:

the utility model provides an oxygen boosting methane-rich gas spouts unit ground screening test device which characterized in that: the system comprises a methane-rich gas generator, an oxygen-rich gas generator and a gas injection unit test component.

The methane-rich gas generator comprises a methane-rich combustion chamber, a first throttling pore plate and a first external connector which are connected in sequence; and a first igniter, a first methane gas inlet and a first oxygen gas inlet are respectively arranged on the left end head of the methane-rich combustion chamber.

The oxygen-enriched fuel gas generator comprises an oxygen-enriched combustion chamber, a second throttling orifice plate and a second external interface which are connected in sequence; and a second igniter, a second methane inlet and a second oxygen inlet are respectively arranged on the right end head of the oxygen-enriched combustion chamber.

The gas injection unit test component comprises a head, a fixing flange, a body and a throat.

The head comprises a main pipeline, a fuel inlet flange and an oxidant inlet flange which are arranged on the side part of the main pipeline, a fuel before-injection pressure monitoring device and an oxidant before-injection pressure monitoring device which are arranged on the main pipeline, an external flange arranged at the gas output end of the main pipeline, and a head clapboard which is arranged on the main pipeline and is positioned between the fuel inlet flange and the oxidant inlet flange; wherein pressure monitoring device and fuel inlet flange are located the downside of head baffle before fuel way spouts, are close to the gas output of trunk line, and pressure monitoring device and oxidant inlet flange are located the upside of head baffle before oxidant way spouts, keep away from the gas output of trunk line.

A through hole matched with the outer diameter of the upper end of the gas-gas injection unit test piece is formed in the middle of the head partition plate;

a through hole matched with the outer diameter of the lower end of the gas-gas injection unit test piece is formed in the external flange of the head; and the external flange is connected with the fixed flange through bolts.

The methane-rich gas generator is connected with a fuel inlet flange of the head part through a first external connector; the oxygen-enriched fuel gas generator is connected with the oxidant inlet flange of the head part through a second external connector.

The body part and the throat are sequentially arranged below the fixed flange, and a through hole is formed in the middle of the fixed flange.

The body internal channel is a test piece combustion chamber; and a third igniter, a pulsating pressure monitoring device, a temperature monitoring device and a chamber pressure monitoring device are arranged on the side wall of the body part.

The body part and the throat are cooled by adopting a cooling scheme.

Further, the number of the pulsating pressure monitoring device, the temperature monitoring device and the chamber pressure monitoring device is one or more. The number of the pulsating pressure monitoring devices, the temperature monitoring devices and the room pressure monitoring devices can be flexibly adjusted according to the test requirements.

Further, the cooling scheme is a copper heat sink scheme or an interlayer cooling scheme. According to the difference of the gas temperature and the test duration, the body part and the throat of the copper heat sink assembly scheme or the interlayer cooling scheme are selected, so that the test is conveniently and quickly carried out, and the test efficiency is improved.

Furthermore, the body part and the throat are sequentially arranged below the fixed flange through the long screw column group; the long screw column group successively passes through the throat and the body, and the end part of the long screw column group is in threaded connection with the fixed flange. In the gas injection unit screening test, the head of the test piece can be quickly replaced by only dismounting the bolt between the external flange and the fixing flange, the body and the throat are not dismounted, the test is conveniently and quickly carried out, the test efficiency is improved, and the body and the throat are also conveniently replaced.

The ground screening test method of the oxygen-enriched methane-rich gas injection unit is characterized in that the ground screening test device of the oxygen-enriched methane-rich gas injection unit is adopted, and the method comprises the following implementation steps:

1) assembling test piece head

According to the structural simulation principle, a plurality of gas-gas injection unit test pieces are respectively assembled with a main pipeline, a head partition plate, an external flange, a fuel inlet flange and an oxidant inlet flange of a plurality of heads to form a plurality of test piece heads.

2) Calculating methane oxygen flow

And analyzing the flow, the temperature and the components of the methane-rich gas and the oxygen-rich gas required by the test of the gas-gas injection unit test piece according to the temperature and component simulation principle, and respectively obtaining the flow of methane and oxygen required by the tissue combustion of the methane-rich gas generator and the oxygen-rich gas generator through thermodynamic calculation.

3) Calculating the throat diameter of the throat

And determining the chamber pressure of the combustion chamber of the test piece according to a decompression simulation principle, and calculating the throat diameter of the throat.

4) Selecting and installing a first orifice plate and a second orifice plate

And (3) determining the preset values of the chamber pressures of the methane-rich gas generator and the oxygen-rich gas generator by combining the chamber pressure of the test piece determined in the step 3), and selecting a first throttle orifice plate and a second throttle orifice plate with proper apertures according to the flow and temperature parameters of the methane-rich gas and the oxygen-rich gas obtained in the step 2) and respectively installing the first throttle orifice plate and the second throttle orifice plate in the methane-rich gas generator and the oxygen-rich gas generator.

5) Selection of cooling scheme

The body and throat fitted with the appropriate cooling scheme are selected according to the gas temperature and the duration of the test.

6) Assembly test device

Connecting the head part, the fixed flange, the body part, the throat, the methane-rich gas generator and the oxygen-rich gas generator of one of the test pieces obtained in the step 1), and checking each connection part to ensure good sealing and no leakage.

7) Start of monitoring

Opening an oxidant path before-spraying pressure monitoring device, a fuel path before-spraying pressure monitoring device, a pulsating pressure monitoring device, a temperature monitoring device and a chamber pressure monitoring device, and starting monitoring data acquisition programs.

8) Generating methane-rich fuel gas and oxygen-rich fuel gas

Supplying methane and oxygen with corresponding flow rates to the methane-rich combustion chamber and the oxygen-rich combustion chamber according to the flow rates of the methane and the oxygen obtained in the step 2), and starting a first igniter and a second igniter, wherein the methane and the oxygen are combusted in the methane-rich combustion chamber and the oxygen-rich combustion chamber to respectively generate methane-rich fuel gas and oxygen-rich fuel gas with required temperatures; establishing corresponding pressure in the methane-rich combustion chamber according to the chamber pressure preset value determined in the step 4) under the action of the first throttling orifice plate, and then sequentially entering the head part through the first external connector and the fuel inlet flange; and (3) establishing corresponding pressure in the oxygen-enriched combustion chamber according to the chamber pressure preset value determined in the step 4) under the action of a second throttling orifice plate, and then sequentially entering the head through a second external interface and an oxidant inlet flange.

9) Gas-gas injection unit test piece ignition test

The methane-rich gas and the oxygen-rich gas entering the head are injected into the test piece combustion chamber through the gas injection unit test piece, are ignited through the third igniter and are fully combusted in the test piece combustion chamber.

10) And reading each monitoring data and storing the record.

11) Detaching the current test piece head, replacing the further test piece head obtained in step 1), and repeating step 6) -10) until all test piece heads containing all gas injection unit test pieces have been tested.

12) Gas-gas injection unit test piece screening

And after all the gas injection unit test pieces are tested, screening qualified gas injection unit test pieces according to the obtained test data of the gas injection unit test pieces in the head parts of each test piece.

Further, the specific operation method of step 1) is as follows: welding the upper end of the gas-gas injection unit test piece and the inner wall of the through hole in the head partition plate, the outer edge of the head partition plate and the inner wall of the head main pipeline, and the gas-gas injection unit test piece and the inner wall of the through hole in the external flange in sequence, and inspecting each welding position after welding to ensure that gas does not leak; and finally, assembling a fuel inlet flange and an oxidant inlet flange on the side surface of the main pipeline of the head part. The structure well fixes the gas injection unit and increases the stability of the gas injection unit.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the ground screening test device and the ground screening test method for the oxygen-enriched methane-enriched gas injection unit, the methane-enriched gas generator and the oxygen-enriched gas generator are adopted to provide methane-enriched gas and oxygen-enriched gas with certain temperature, components and pressure as propellants according to the temperature and component simulation principle, so that the state of the propellants in the working state of the thrust chamber of the liquid oxygen methane engine is simulated, the combustion characteristics of the gas injection unit under the condition of the thrust chamber are better simulated, and effective data support is provided for screening of the injection unit.

2. According to the ground screening test device and the ground screening test method for the oxygen-enriched methane-enriched gas injection unit, provided by the invention, on the premise that the flowing state of methane-enriched gas and oxygen-enriched gas before injection is kept to be the same as that of a liquid oxygen methane thrust chamber according to a decompression simulation principle, a throat with a proper throat diameter is selected, and the pressure of a test piece combustion chamber is reduced, so that the high-pressure test difficulty is greatly reduced, the safety of a high-pressure test is improved, the operation is simple, and the implementation is easy.

3. According to the ground screening test device and the ground screening test method for the oxygen-enriched methane-enriched gas injection unit, the gas injection unit test piece is assembled at the head part according to the structural simulation principle, and the gas injection unit test piece can be quickly replaced by only disassembling bolts between the external flange and the fixed flange without disassembling the fixed flange, the body part and the throat, so that the test efficiency is improved, and the rapid screening is realized.

4. According to the ground screening test device and the test method for the oxygen-enriched methane-enriched gas injection unit, the body part and the throat of a proper cooling scheme are selected according to the temperature and the burning duration of gas in the test, the body part and the throat are connected with the fixed flange through the long screw column group, and when the body part and the throat need to be replaced, only the long screw column group needs to be disassembled, so that the ground screening test device and the ground screening test method are simple and convenient to apply, and the test efficiency is high.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a ground screening test device of an oxygen-enriched methane-rich gas injection unit according to the present invention;

FIG. 2 is a schematic structural diagram of a head of a test piece of the ground screening test device of the oxygen-enriched methane-rich gas injection unit of the embodiment of the invention;

description of reference numerals:

1-a first igniter, 2-a first methane gas inlet, 3-a first oxygen inlet, 4-a methane-rich gas generator, 5-a first orifice plate, 6-a first external interface, 7-a head, 8-an oxidant circuit pre-injection pressure monitoring device, 9-a second external interface, 10-a second orifice plate, 11-an oxygen-rich gas generator, 12-a second methane gas inlet, 13-a second igniter, 14-a second oxygen inlet, 15-a fuel circuit pre-injection pressure monitoring device, 16-an external flange, 17-a fixed flange, 18-a third igniter, 19-a pulsating pressure monitoring device, 20-a temperature monitoring device, 21-a body, 22-a throat, 23-a chamber pressure monitoring device, 24-a long screw column set, 25-gas injection unit test component, 26-methane-rich combustor, 27-oxygen-rich combustor, 28-fuel inlet flange, 29-oxidant inlet flange, 30-test piece combustor, 31-head baffle plate, 32-gas injection unit test piece.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

As shown in fig. 1 and 2, the oxygen-rich methane-rich gas injection unit ground screening test device of the invention comprises a methane-rich gas generator 4, an oxygen-rich gas generator 11 and a gas injection unit test component 25. The gas injection unit test component 25 is a main body of the test device, and the methane-rich gas generator 4 and the oxygen-rich gas generator 11 are positioned at the upstream of the gas injection unit test component 25 and respectively provide methane-rich gas and oxygen-rich gas with certain temperature, pressure and components for the gas injection unit component 25 to serve as fuel and oxidant.

The gas injection unit test assembly 25 comprises a head 7, a mounting flange 17, a body 21 and a throat 22. The head 7 is used for placing and welding a gas injection unit test piece 32 and connecting the methane-rich gas generator 4 and the oxygen-rich gas generator 11; the fixed flange 17 is used for connecting the head part 7 and the body part 21; the inner channel of the body part 21 is a test piece combustion chamber 30; the throat 22 is used to regulate the test piece combustion chamber 30 chamber pressure.

The head part 7 comprises a main pipeline, a fuel inlet flange 28 and an oxidant inlet flange 29 which are arranged on the side part of the main pipeline, a fuel pre-injection pressure monitoring device 15 and an oxidant pre-injection pressure monitoring device 8 which are arranged on the main pipeline, an external flange 16 arranged on the fuel output end of the main pipeline, and a head part clapboard 31 which is arranged on the main pipeline and is positioned between the fuel inlet flange 28 and the oxidant inlet flange 29; wherein the pressure monitoring device 15 before fuel path spraying and the fuel inlet flange 28 are positioned at the lower side of the head clapboard 31 and close to the fuel gas output end of the main pipeline, and the pressure monitoring device 8 before oxidant path spraying and the oxidant inlet flange 29 are positioned at the upper side of the head clapboard 31 and far away from the fuel gas output end of the main pipeline; the head partition plate 31 is used for isolating methane-rich gas and oxygen-rich gas, and the methane-rich gas and the oxygen-rich gas respectively enter the gas injection unit test piece 32 through different gas flow inlets on the gas injection unit test piece 32; a through hole matched with the outer diameter of the upper end of the gas injection unit test piece 32 is formed in the middle of the head partition plate 31 and used for welding the upper end of the gas injection unit test piece 32; a through hole matched with the outer diameter of the lower end of the gas injection unit test piece 32 is formed in the external flange 16 of the head 7 and used for welding the lower end of the gas injection unit test piece 32; the external flange 16 is connected with the fixed flange 17 through bolts;

the methane-rich gas generator 4 comprises a methane-rich combustion chamber 26, a first throttling pore plate 5 and a first external interface 6 which are connected in sequence; a first igniter 1, a first methane gas inlet 2 and a first oxygen gas inlet 3 are respectively arranged on the left end of the methane-rich combustion chamber 26; the methane-rich gasifier 4 is connected to a fuel inlet flange 28 of the head 7 via a first external connection 6.

The oxygen-enriched fuel gas generator 11 comprises an oxygen-enriched combustion chamber 27, a second throttling pore plate 10 and a second external interface 9 which are connected in sequence; the right end of the oxygen-enriched combustion chamber 27 is respectively provided with a second igniter 13, a second methane gas inlet 12 and a second oxygen gas inlet 14; the oxygen-enriched gas generator 11 is connected to an oxidant inlet flange 29 of the head 7 via a second external connection 9.

The body part 21 and the throat 22 are sequentially arranged below the fixed flange 17 through a long screw column group 24; the long screw column group 24 successively passes through the throat 22 and the body 21, and the end part of the long screw column group is in threaded connection with the fixed flange 17; and a through hole is formed in the middle of the fixing flange 17, so that methane-rich gas and oxygen-rich gas can enter the test piece combustion chamber 30 through the fixing flange 17.

The inner channel of the body part 21 is a test piece combustion chamber 30; a third igniter 18, one or a plurality of pulsating pressure monitoring devices 19, a temperature monitoring device 20 and a chamber pressure monitoring device 23 are arranged on the side wall of the body part 21; the methane-rich fuel gas and the oxygen-rich fuel gas enter the test piece combustion chamber 30 through the gas injection unit test piece 32, are ignited by the third igniter 18, are fully combusted in the test piece combustion chamber 30, and the combustion characteristic parameters are recorded by the pulse pressure monitoring device 19, the temperature monitoring device 20 and the chamber pressure monitoring device 23.

The throat 22 is used for building pressure in the test piece combustion chamber 30, and the pressure in the test piece combustion chamber 30 can be reduced by selecting the throat 22 with a proper throat diameter.

The body part 21 and the throat 22 are both cooled by adopting a cooling scheme. The body 21 and throat 22 equipped with the copper heat sink scheme or the sandwich cooling scheme are selected according to the test duration and the combustion temperature.

The oxygen-enriched methane-rich gas injection unit ground screening test method adopting the oxygen-enriched methane-rich gas injection unit ground screening test device shown in figure 1 comprises the following implementation steps:

1) assembling test piece head

According to the principle of structural simulation, a plurality of gas injection unit test pieces 32 are respectively assembled with the main pipeline of the plurality of heads 7, the head partition plate 31, the external flange 16, the fuel inlet flange 28 and the oxidant inlet flange 29 to form a plurality of test piece heads. The specific operation method comprises the following steps: sequentially welding the upper end of the gas-gas injection unit test piece 32 and the inner wall of the through hole in the head partition plate 31, the outer edge of the head partition plate 31 and the inner wall of the main pipeline of the head 7, and the gas-gas injection unit test piece 32 and the inner wall of the through hole in the external flange 16, and after welding is finished, checking each welding position to ensure that the inner cavity channel is well sealed and does not leak; finally, a fuel inlet flange 28 and an oxidant inlet flange 29 are fitted to the side of the main conduit of the head 7.

2) Calculating methane oxygen flow

According to the temperature and component simulation principle, the flow, the temperature and the components of the methane-rich fuel gas and the oxygen-rich fuel gas required by the test of the gas injection unit test piece 32 are analyzed, and the flow of the methane and the oxygen required by the organization combustion of the methane-rich fuel gas generator 4 and the oxygen-rich fuel gas generator 11 are respectively obtained through thermodynamic calculation.

3) Calculating the throat diameter of the throat 22

The throat diameter of the throat 22 is calculated by determining the chamber pressure of the test piece combustion chamber 30 according to the depressurization simulation principle.

4) Selecting and installing a first orifice plate 5 and a second orifice plate 10

And (3) determining the preset values of the chamber pressure of the methane-rich gas generator 4 and the oxygen-rich gas generator 11 by combining the chamber pressure of the test piece combustion chamber 30 determined in the step 3), and selecting a first orifice plate 5 and a second orifice plate 10 with proper pore diameters according to the flow and temperature parameters of the methane-rich gas and the oxygen-rich gas obtained in the step 2) and respectively installing the first orifice plate and the second orifice plate in the methane-rich gas generator 4 and the oxygen-rich gas generator 11.

5) Selection of cooling scheme

The body 21 and throat 22 fitted with a copper heat sink solution or a sandwich cooling solution are selected according to the gas temperature and the test duration.

6) Assembly test device

Connecting the head of the test piece obtained in step 1) with the mounting flange 17, the body 21, the throat 22, the methane-rich gasifier 4 and the oxygen-rich gasifier 11, and checking the connections to ensure good sealing and no leakage.

7) Start of monitoring

Before the test, opening an oxidant path before-spraying pressure monitoring device 8, a fuel path before-spraying pressure monitoring device 15, a pulsating pressure monitoring device 19, a temperature monitoring device 20 and a chamber pressure monitoring device 23, wherein the number of the pulsating pressure monitoring device 19, the temperature monitoring device 20 and the chamber pressure monitoring device 23 is one or more; and starting each monitoring data acquisition program.

8) Generating methane-rich fuel gas and oxygen-rich fuel gas

Supplying methane and oxygen with corresponding flow rates to the methane-rich combustion chamber 26 and the oxygen-rich combustion chamber 27 according to the flow rates of the methane and the oxygen obtained in the step 2), and starting the first igniter 1 and the second igniter 13, wherein the methane and the oxygen are combusted in the methane-rich combustion chamber 26 and the oxygen-rich combustion chamber 27 to respectively generate methane-rich fuel gas and oxygen-rich fuel gas with required temperatures; establishing corresponding pressure in the methane-rich combustion chamber 26 according to the chamber pressure preset value determined in the step 4) under the action of the first throttling orifice plate 5, and then sequentially entering the head part 7 through the first external connector 6 and the fuel inlet flange 28; the oxygen-enriched gas builds up a corresponding pressure in the oxygen-enriched combustion chamber 27 under the action of the second orifice plate 10 according to the predetermined chamber pressure value determined in step 4), and then enters the head 7 through the second external interface 9 and the oxidant inlet flange 29 in sequence.

9) Gas injection unit test piece 32 ignition test

The methane-rich gas and the oxygen-rich gas introduced into the head 7 are injected into the test piece combustor 30 via the gas injection unit test piece 32, ignited by the third igniter 18, and sufficiently combusted in the test piece combustor 30.

10) And reading each monitoring data and storing the record.

11) Detaching the current trial head, replacing the other trial head obtained in step 1), and repeating step 6) -10) until all of the trial heads containing all of the gas injection unit trial 32 have been tested.

12) Gas injection unit test piece 32 screening

After all the gas injection unit test pieces 32 are tested, qualified gas injection unit test pieces 32 are screened out according to the obtained test data of the gas injection unit test pieces 32 in the head of each test piece.