阅读说明：本技术 一套适用于发动机的水油双工质喷注系统 (Water-oil double-working-medium injection system suitable for engine ) 是由 贾东鹏 刘朝阳 潘余 王宁 马磊 于 2021-08-28 设计创作，主要内容包括：本发明提供一套适用于发动机的水油双工质喷注系统,包括：燃烧室；第一气压可调气源；油存储罐；第一加热器；第一主管道；第一回收罐；分别连通第一加热器和第一回收罐的第一支管道；设置在第一主管道上的第一阀门；设置在第一支管道上的第三阀门；第二气压可调气源；水存储罐；第二加热器；第二主管道,第二主管道的一端与第二加热器连通,第二主管道的另一端连通燃烧室；第二回收罐；与第二加热器和第二回收罐连通的第二支管道,第二支管道的一端第二加热器连通,第二支管道的另一端连通；设置在第二主管道上的第二阀门；设置在第二支管道上的第四阀门。(The invention provides a set of water-oil double working medium injection system suitable for an engine, which comprises: a combustion chamber; a first adjustable air pressure source; an oil storage tank; a first heater; a first main pipe; a first recovery tank; the first branch pipeline is communicated with the first heater and the first recovery tank respectively; a first valve disposed on the first main pipe; a third valve disposed on the first branch conduit; a second air pressure adjustable air source; a water storage tank; a second heater; one end of the second main pipeline is communicated with the second heater, and the other end of the second main pipeline is communicated with the combustion chamber; a second recovery tank; the second branch pipeline is communicated with the second heater and the second recovery tank, one end of the second branch pipeline is communicated with the second heater, and the other end of the second branch pipeline is communicated; a second valve disposed on the second main pipe; and the fourth valve is arranged on the second branch pipeline.)

1. A set of water-oil double-medium injection system suitable for an engine is characterized by comprising:

a combustion chamber;

a first adjustable air pressure source;

the oil storage tank is connected with the first air pressure adjustable air source;

a first heater adapted to heat oil output from the oil storage tank;

one end of the first main pipeline is communicated with the first heater, and the other end of the first main pipeline is communicated with the combustion chamber;

a first recovery tank;

one end of the first branch pipeline is communicated with the first heater, and the other end of the first branch pipeline is communicated with the first recovery tank;

a first valve disposed on the first main pipe;

a third valve disposed on the first branch conduit;

a second air pressure adjustable air source;

the water storage tank is connected with the second air pressure adjustable air source;

a second heater adapted to heat water output from the water storage tank;

one end of the second main pipeline is communicated with the second heater, and the other end of the second main pipeline is communicated with the combustion chamber;

a second recovery tank;

one end of the second branch pipeline is communicated with the second heater, and the other end of the second branch pipeline is communicated with the second recovery tank;

a second valve disposed on the second main pipe;

a fourth valve disposed on the second branch conduit.

2. The water-oil dual working medium injection system according to claim 1, wherein the first valve is a first solenoid valve, the second valve is a second solenoid valve, the third valve is a third solenoid valve, and the fourth valve is a fourth solenoid valve.

3. A water and oil duplex, mass injection system according to claim 1 wherein the first main pipe is provided with a first nozzle at an end facing the combustion chamber and the second main pipe is provided with a second nozzle at an end facing the combustion chamber; the first nozzle is a first sonic nozzle, and the second nozzle is a second sonic nozzle.

4. The water-oil dual working medium injection system according to claim 1, further comprising: a first pressure sensor disposed around a first main conduit between the first valve to the combustion chamber, the first pressure sensor adapted to test pressure in the first main conduit; a second pressure sensor disposed about a second main conduit between the second valve and the combustion chamber, the second pressure sensor adapted to test pressure in the second main conduit.

5. The water-oil dual working medium injection system according to claim 1, further comprising: a first flow meter disposed in a first main conduit between the first valve to the combustion chamber, the first flow meter adapted to test the flow of oil in the first main conduit; a second flow meter disposed in a second main conduit between the second valve and the combustion chamber, the second flow meter adapted to test the flow of water in the second main conduit.

6. The water-oil dual working medium injection system according to claim 1, further comprising: a first temperature test unit for testing the temperature of the oil in the first main pipe, the first temperature test unit being disposed around the first main pipe between the first valve and the combustion chamber; a second temperature test unit for testing the temperature of water in the second main pipe, the second temperature test unit being disposed around the second main pipe between the second valve and the combustion chamber.

7. The water-oil dual working medium injection system according to claim 6, wherein the first temperature testing unit comprises a thermocouple, and the second temperature testing unit comprises a thermocouple.

8. The water-oil dual working medium injection system according to claim 1, further comprising: the control unit is suitable for controlling the opening and closing of the first valve, the second valve, the third valve and the fourth valve; the program-controlled computer is connected with the control unit and is connected with the first pressure sensor, the second pressure sensor, the first temperature testing unit, the second temperature testing unit, the first flow rate tester and the second flow rate tester. And the data tested by the first pressure sensor, the second pressure sensor, the first temperature testing unit, the second temperature testing unit, the first flow tester and the second flow tester are transmitted to the program-controlled computer.

9. The dual-fluid injection system of claim 1, wherein the oil comprises kerosene.

Technical Field

The invention relates to the field of fuel injection, in particular to a water-oil dual-working-medium injection system suitable for an engine.

Background

The engine is in an extremely harsh thermal environment during the flight process, and the regenerative cooling thermal protection technology becomes an important method for solving the thermal protection problem of the engine. The jet fuel flows through the cooling channel before being injected into the combustion chamber, and the cooling channel absorbs a large amount of heat and then injects the jet fuel into the combustion chamber. The temperature of kerosene rises gradually after absorbing heat, and cracking starts when the temperature exceeds 500 ℃ usually. The cracking process is accompanied by partial coking and carbon deposition, and the whole cooling channel can be blocked in serious cases, thereby bringing serious disasters to the work of an engine. Research shows that the catalytic reforming of fuel can effectively solve the problem of coking and carbon deposition in the regenerative cooling channel, and provides a new idea for the application of the regenerative cooling channel of the engine. However, catalytic reforming of fuel requires a certain catalyst to function, which is difficult to apply in extremely fine engine regeneration cooling channels.

In the injection method which is widely used at present, gaseous fuel is generally stored in a high-pressure gas cylinder, is directly injected into a combustion chamber after being decompressed by a decompressor, and the starting time and the ending time of the injection are controlled by a pneumatic valve. Liquid fuel is difficult to inject directly into the combustion chamber and often requires reliance on high pressure nitrogen or a fuel pump to inject into the combustion chamber. As a ground test device for engines, liquid fuel is currently injected into the combustion chamber under the action of high-pressure nitrogen.

The fuel injection schemes mentioned in the current published reports almost all inject a single working medium, most injection systems have no heating capability, and few reports are made about injection systems capable of injecting two working mediums, particularly injection systems for researching two working mediums, namely water vapor and hot kerosene.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the problem of heating injection of single fuel in the prior art, and water vapor is used as another working medium to be injected into a combustion chamber, so that a set of water-oil dual-working-medium injection system suitable for an engine is provided.

The invention provides a set of water-oil double working medium injection system suitable for an engine, which comprises: a combustion chamber; a first adjustable air pressure source; the oil storage tank is connected with the first air pressure adjustable air source; a first heater adapted to heat oil output from the oil storage tank; one end of the first main pipeline is communicated with the first heater, and the other end of the first main pipeline is communicated with the combustion chamber; a first recovery tank; one end of the first branch pipeline is communicated with the first heater, and the other end of the first branch pipeline is communicated with the first recovery tank; a first valve disposed on the first main pipe; a third valve disposed on the first branch conduit; a second air pressure adjustable air source; the water storage tank is connected with the second air pressure adjustable air source; a second heater adapted to heat water output from the water storage tank; one end of the second main pipeline is communicated with the second heater, and the other end of the second main pipeline is communicated with the combustion chamber; a second recovery tank; one end of the second branch pipeline is communicated with the second heater, and the other end of the second branch pipeline is communicated with the second recovery tank; a second valve disposed on the second main pipe; a fourth valve disposed on the second branch conduit.

Optionally, the first valve is a first electromagnetic valve, the second valve is a second electromagnetic valve, the third valve is a third electromagnetic valve, and the fourth valve is a fourth electromagnetic valve.

Optionally, a first nozzle is arranged at one end of the first main pipe facing the combustion chamber, and a second nozzle is arranged at one end of the second main pipe facing the combustion chamber; the first nozzle is a first sonic nozzle, and the second nozzle is a second sonic nozzle.

Optionally, the method further includes: a first pressure sensor disposed around a first main conduit between the first valve to the combustion chamber, the first pressure sensor adapted to test pressure in the first main conduit; a second pressure sensor disposed about a second main conduit between the second valve and the combustion chamber, the second pressure sensor adapted to test pressure in the second main conduit.

Optionally, the method further includes: a first flow meter disposed in a first main conduit between the first valve to the combustion chamber, the first flow meter adapted to test the flow of oil in the first main conduit; a second flow meter disposed in a second main conduit between the second valve and the combustion chamber, the second flow meter adapted to test the flow of water in the second main conduit.

Optionally, the method further includes: a first temperature test unit for testing the temperature of the oil in the first main pipe, the first temperature test unit being disposed around the first main pipe between the first valve and the combustion chamber; a second temperature test unit for testing the temperature of water in the second main pipe, the second temperature test unit being disposed around the second main pipe between the second valve and the combustion chamber.

Optionally, the first temperature testing unit includes a thermocouple, and the second temperature testing unit includes a thermocouple.

Optionally, the method further includes: the control unit is suitable for controlling the opening and closing of the first valve, the second valve, the third valve and the fourth valve; the program-controlled computer is connected with the control unit and is connected with the first pressure sensor, the second pressure sensor, the first temperature testing unit, the second temperature testing unit, the first flow rate tester and the second flow rate tester. And the data tested by the first pressure sensor, the second pressure sensor, the first temperature testing unit, the second temperature testing unit, the first flow tester and the second flow tester are transmitted to the program-controlled computer.

Optionally, the oil comprises kerosene.

The technical scheme of the invention has the following beneficial effects:

the water-oil dual-working-medium injection system suitable for the engine, provided by the technical scheme of the invention, can ensure the stable supply of water and kerosene, heats the two working mediums to the temperature required by the test through two sets of direct current heating systems, and realizes the accurate injection process of water vapor and supercritical oil by depending on the accurate matching of the electromagnetic valve and the control time sequence. By the device, the influence of parameters such as water-oil ratio, steam temperature, supercritical kerosene temperature and the like on the combustion characteristics of the water-oil double working medium in the supersonic velocity airflow can be fully researched. The water-oil dual-working-medium injection system disclosed by the invention utilizes two sets of independent heaters to respectively finish the heating processes of water and oil, can more truly simulate the working condition of an engine compared with normal-temperature fuel, and provides reliable equipment for experimental research on the combustion characteristics of water-oil dual working media in a combustion chamber; the requirement of simultaneous and independent injection of two working media can be met depending on the accurate matching of the electromagnetic valve and the experimental time sequence; the whole set of equipment has simple structure, easy operation and strong modification.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a water-oil dual working medium injection system according to an embodiment of the present invention.

Detailed Description

The enhancement effect of the independent injection of the kerosene and the water on the performance of the engine is verified by basic theoretical calculation.

On the basis, a set of water-oil dual-working-medium injection system suitable for the engine is designed to carry out experimental verification, and the water-oil dual-working-medium injection system designed by the invention can simultaneously inject two working mediums, has heating capacity and has important engineering significance. The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Referring to fig. 1, a water-oil dual-working-medium injection system suitable for an engine according to an embodiment of the present invention includes:

a combustion chamber 200;

a first adjustable air pressure source 100;

an oil storage tank 110 connected to the first adjustable air pressure source 100;

a first heater 130, the first heater 130 being adapted to heat oil output from the oil storage tank 110;

a first main pipe (not labeled), one end of which is communicated with the first heater 130, and the other end of which is communicated with the combustion chamber 200;

a first recovery tank (not shown);

a first branch pipe (not shown), one end of which is communicated with the first heater 130, and the other end of which is communicated with the first recovery tank;

a first valve 140, the first valve 140 being disposed on the first main pipe;

a third valve 120, the third valve 120 being disposed on the first branch conduit;

a second air pressure adjustable air source 101;

a water storage tank 111 connected to the second adjustable air pressure source 101;

a second heater 131, the second heater 131 being adapted to heat the water output from the water storage tank 111;

a second main pipe (not labeled), one end of which is communicated with the second heater 131, and the other end of which is communicated with the combustion chamber 200;

a second recovery tank (not shown);

a second branch pipe (not shown), one end of which is communicated with the second heater 131, and the other end of which is communicated with the second recovery tank;

a second valve 141, the second valve 141 being disposed on the second main pipe;

a fourth valve 121, wherein the fourth valve 121 is disposed on the second branch pipe.

In this example, the oil comprises kerosene. In other embodiments, the oil may also be other fuel oils.

In one embodiment, the first valve 140 is a first solenoid valve, the second valve 141 is a second solenoid valve, the third valve 120 is a third solenoid valve, and the fourth valve 121 is a fourth solenoid valve.

The gas in the first adjustable gas pressure source 100 is nitrogen, and the gas in the second adjustable gas pressure source 101 is nitrogen. The pressure of the gas in the first adjustable gas pressure source 100 can be adjusted and the pressure of the gas in the second adjustable gas pressure source 101 can be adjusted.

In a specific embodiment, the pressure in the first air pressure adjustable air source 100 is 0 to 5MPa, and the pressure in the first air pressure adjustable air source 100 can be adjusted within a range of 0 to 5MPa, such as 5MPa, 4MPa, 3MPa, 2MPa, or 1MPa, as required.

The pressure in the second air pressure adjustable air source 101 is 0-5 MPa, and the pressure in the second air pressure adjustable air source 101 can be adjusted within the range of 0-5 MPa according to needs, such as 5MPa, 4MPa, 3MPa, 2MPa and 1 MPa.

The water-oil dual-medium injection system further comprises: a first pressure sensor 170, said first pressure sensor 170 being adapted to test the pressure in the first main conduit; a second pressure sensor 171, said second pressure sensor 171 being adapted to test the pressure in the second main pipe. Specifically, the first pressure sensor 170 is disposed around the first main pipe between the first valve 140 and the combustion chamber 200; a second pressure sensor 171 is disposed around the second main pipe between the second valve 141 and the combustion chamber 200.

The water-oil dual-medium injection system further comprises: a first flow meter 160, said first flow meter 160 being arranged in a first main conduit between said first valve 140 to said combustion chamber 200, said first flow meter 160 being adapted to test the flow of oil in the first main conduit; a second flow meter 161, said second flow meter 161 being arranged in a second main conduit between said second valve 141 to said combustion chamber 200, said second flow meter 161 being adapted to test the flow of water in the second main conduit.

The water-oil dual-medium injection system further comprises: a first temperature testing unit 150, the first temperature testing unit 150 being used for testing the temperature of the oil in the first main pipe, the first temperature testing unit 150 comprising a thermocouple, the first temperature testing unit 150 being disposed around the first main pipe between the first valve 140 and the combustion chamber 200; a second temperature test unit 151, the second temperature test unit 151 is used for testing the temperature of the water in the second main pipeline, the second temperature test unit 151 includes a thermocouple, the second temperature test unit 151 is disposed around the second main pipeline between the second valve 141 and the combustion chamber 200.

In the present embodiment, the first temperature test unit 150 is disposed around the first main pipe between the first flow meter 160 and the combustion chamber 200, and the second temperature test unit 151 is disposed around the second main pipe between the second flow meter 161 and the combustion chamber 200.

The first main pipeline orientation the one end of combustion chamber 200 is provided with first nozzle, the second main pipeline orientation the one end of combustion chamber 200 is provided with the second nozzle. In one embodiment, the first nozzle is a first sonic nozzle and the second nozzle is a second sonic nozzle. The first sonic nozzle may inject oil to the combustion chamber 200 at a sonic velocity, and the second sonic nozzle may inject water to the combustion chamber 200 at a sonic velocity.

The position of the first sonic nozzle within the combustion chamber 200 can be adjusted and the position of the second sonic nozzle within the combustion chamber 200 can be adjusted, that is, the relative position between the first sonic nozzle and the second sonic nozzle can be adjusted.

The water-oil dual-medium injection system further comprises: the control unit 180 is adapted to control the opening and closing of the first valve 140, the second valve 141, the third valve 120 and the fourth valve 121, the control unit 180 is connected with the programmable computer 190, and the programmable computer 190 is connected with the first pressure sensor 170, the second pressure sensor 171, the first temperature testing unit 150, the second temperature testing unit 151, the first flow meter 160 and the second flow meter 161. The data tested by the first pressure sensor 170, the second pressure sensor 171, the first temperature testing unit 150, the second temperature testing unit 151, the first flow meter 160 and the second flow meter 161 are transmitted to the programmed computer 190.

The water-oil dual-working-medium jetting system can ensure the stable supply of water and kerosene in the working process, two working mediums are heated to the temperature required by the test through two sets of direct current heating systems, and the accurate jetting process of water vapor and supercritical oil is realized depending on the accurate matching of an electromagnetic valve and a control time sequence. By the device, the influence of parameters such as water-oil ratio, steam temperature and supercritical oil temperature on the combustion characteristics of the water-oil double working medium in the supersonic velocity airflow can be fully researched.

The water-oil dual-working-medium injection system disclosed by the invention utilizes two sets of independent heaters to respectively finish the heating processes of water and oil, can more truly simulate the working condition of a scramjet engine compared with normal-temperature fuel, and provides reliable equipment for experimental research on the combustion characteristics of water-oil dual working media in a supersonic combustion chamber; the requirement of simultaneous and independent injection of two working media can be met depending on the accurate matching of the electromagnetic valve and the experimental time sequence; the whole set of equipment has simple structure, easy operation and strong modification.

The water-oil double working medium injection system of the invention depends on the accurate matching of the first heater 130 and the second heater 131 with high power and the first valve 140, the third valve 120, the second valve 141 and the fourth valve 121, so as to ensure the realization of the heating and injection processes, and water and oil which are heated are respectively injected into a combustion chamber. In one embodiment, first heater 130 has a power of 0-60kW and second heater 131 has a power of 0-20 kW.

The working method of the water-oil dual-medium injection system comprises the following steps:

a first time sequence stage step, a second time sequence stage step and a third time sequence stage step are sequentially carried out;

a first timing stage step: the first valve, the second valve, the third valve and the fourth valve are all in a closed state, the first air pressure adjustable air source is adjusted to a first initial pressure, the second air pressure adjustable air source is adjusted to a second initial pressure, and the first heater and the second heater are all in a heating state;

a second time sequence stage step: the third valve is opened and the first valve is closed, and the heated oil is discharged to the first recovery tank; the fourth valve is opened, the second valve is closed, and the heated water is discharged to the second recovery tank;

in a second sequence phase step, the third valve is opened simultaneously with the fourth valve, specifically, the third valve and the fourth valve are opened at time t ═ to.

A third time sequence stage step: the first and second valves are opened, the third and fourth valves are closed, and water vapor and supercritical oil are injected into the combustion chamber.

Specifically, at time t1, the first valve and the second valve are opened, and the third valve and the fourth valve are closed. In the third time sequence stage step, the temperature of the heated water and oil is stable.

In this embodiment, water and oil are injected into the combustion chamber simultaneously, so that the first and second valves operate in the same manner, and the third and fourth valves operate in the same manner.

Recording the pressure, flow and temperature before water and oil are injected into the combustion chamber during the working process, and capturing a flame luminescence image and a schlieren image with high resolution by using a high-speed camera. By adjusting the power of the first heater, the power of the second heater, the pressure cavities of the first air pressure adjustable air source and the second air pressure adjustable air source, the sizes of the first nozzle and the second nozzle and the relative positions of the injection, the influences of parameters such as the temperature and the proportion of water and oil, the relative positions of the first nozzle and the second nozzle and the like on the combustion characteristics of the water-oil dual-working medium can be respectively researched.

The experimental process is controlled according to the accurate matching of the electromagnetic valve and the experimental time sequence, and the whole set of equipment is more modified. The experimental process of injecting steam after injecting hot kerosene can be realized by simply adjusting the action of the electromagnetic valve.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.