阅读说明：本技术 火箭基组合循环发动机的主动冷却双喷管支板引射火箭 (Active cooling double-nozzle support plate ejection rocket of rocket-based combined cycle engine ) 是由 景婷婷 黎阳 秦飞 张鹏坤 何国强 魏祥庚 于 2019-08-23 设计创作，主要内容包括：本发明公开了一种火箭基组合循环发动机的主动冷却双喷管支板引射火箭,包括支板引射火箭本体,支板引射火箭本体为一实心长方体,用于纵向放置于发动机的隔离段内；在支板引射火箭本体内靠近一短边侧开设有竖直向的燃烧室。燃烧室的靠近另一短边侧、上下间隔开设有两个纵向的拉法尔喷管,与燃烧室相连通。在支板引射火箭本体内,沿着支板引射火箭本体的一长边,然后依次绕于拉法尔喷管的一侧外壁和燃烧室外壁一周,再顺次绕于拉法尔喷管的另一侧外壁和支板引射火箭本体的另一长边,开设有相连通的M型冷却通道。支板引射火箭本体内设置有外侧冷却通道和内侧冷却通道,能够同时满足支板火箭内外侧壁面的冷却需求,实现支板引射火箭的长时间工作。(The invention discloses an actively-cooled double-nozzle support plate ejection rocket of a rocket-based combined cycle engine, which comprises a support plate ejection rocket body, wherein the support plate ejection rocket body is a solid cuboid and is used for being longitudinally placed in an isolation section of the engine; a vertical combustion chamber is arranged near one short side in the support plate ejection rocket body. Two longitudinal Laval nozzles are arranged on the combustion chamber close to the other short side and spaced up and down and communicated with the combustion chamber. In the support plate ejection rocket body, M-shaped cooling channels communicated with each other are formed along one long edge of the support plate ejection rocket body, sequentially wound on the outer wall of one side of the Laval nozzle and the outer wall of the combustion chamber for a circle, and sequentially wound on the outer wall of the other side of the Laval nozzle and the other long edge of the support plate ejection rocket body. The support plate injection rocket is internally provided with the outer side cooling channel and the inner side cooling channel, so that the cooling requirements of the inner side wall surface and the outer side wall surface of the support plate rocket can be met simultaneously, and the long-time work of the support plate injection rocket is realized.)

1. The actively-cooled double-nozzle support plate ejection rocket of the rocket-based combined cycle engine is characterized by comprising a support plate ejection rocket body (1), wherein the support plate ejection rocket body (1) is a solid cuboid and is used for being longitudinally placed in an isolation section of the engine;

a vertical combustion chamber (11) is arranged in the support plate ejection rocket body (1) close to one short side, and the combustion chamber (11) is a cavity with an open upper end;

two longitudinal Laval nozzles (4) are arranged on the other short side of the combustion chamber (11) at intervals from top to bottom and communicated with the combustion chamber (11); each Laval nozzle (4) longitudinally penetrates through the support plate ejection rocket body (1), and the open end of the Laval nozzle is communicated with a combustion chamber of the RBCC engine;

in the support plate ejection rocket body (1), along one long edge of the support plate ejection rocket body (1), sequentially winding the long edge around the outer wall of one side of the Laval nozzle (4) and the outer wall of the combustion chamber (11) for a circle, sequentially winding the long edge of the support plate ejection rocket body (1) and the outer wall of the other side of the Laval nozzle (4) for a circle, and forming M-shaped cooling channels communicated with each other; the M-shaped cooling channels are arranged in a vertically upward layered mode on the support plate ejection rocket body (1), and the number of each layer is one.

2. The actively-cooled double nozzle strut rocket according to claim 1, wherein in the strut rocket body (1), along a long side of the strut rocket body (1), then the strut rocket body is wound on an upper wall or a lower wall of the laval nozzle (4) close to the long side, then the strut rocket body is wound on a circle of an outer wall of the combustion chamber (11), then the strut rocket body is wound on an upper wall or a lower wall of the laval nozzle (4) far from the long side, then along a long side of the strut rocket body (1), cooling channels are opened, and each cooling channel is located at a position where the upper wall or the lower wall of the laval nozzle (4) is located, and each cooling channel is located between two M-type cooling channels at corresponding positions.

3. The actively-cooled double nozzle strut rocket according to claim 2 wherein the cooling passages provided along the long sides of the strut rocket body (1) are outer cooling passages (7); the outer cooling channel (7) is close to the outer wall of the support plate ejection rocket body (1);

an inner side cooling channel (8) is arranged around the outer wall of one side of the Laval nozzle (4) and the outer wall of the combustion chamber (11) in a circle;

the end part of the inner side cooling channel (8) is communicated with the outer side cooling channel (7) at the corresponding position.

4. An actively-cooled double nozzle plate ejector rocket according to claim 3, wherein surface cooling channels (13) are formed in the upper or lower wall of the Laval nozzle (4), wherein one end of each surface cooling channel (13) on both sides is connected to an inner cooling channel (8) of the combustion chamber (11) section, and the other end is connected to the outer cooling channel (7) on the corresponding side.

5. An actively-cooled double nozzle strut rocket according to claim 4 wherein the surface cooling channels (13) have a larger internal diameter than the other cooling channels.

6. The actively-cooled double nozzle supported jet rocket of a rocket-based combined cycle engine according to claim 1, 2 or 3, wherein an outlet liquid collecting cavity (6) and an inlet liquid collecting cavity (5) which are vertical are correspondingly arranged at two vertex angles of the supported jet rocket body (1) far away from the Laval nozzle (4); the inlet liquid collecting cavity (5) and the outlet liquid collecting cavity (6) are communicated with the outer side cooling channel (7) on the corresponding side.

7. An actively-cooled double nozzle strut rocket according to claim 1, 2 or 3 wherein the width of the strut rocket body (1) is less than the width of the isolated section, and two independent gas flow passages are formed with the front and rear side wall surfaces of the isolated section.

8. The actively-cooled double nozzle strut rocket ejector according to claim 1, 2 or 3, wherein the strut rocket head connecting flange (9) is integrally connected to the upper portion of the strut rocket ejector body (1) and is used for being connected with the upper wall of the isolation section, and the strut rocket ejector body is a solid plate body, and the plate body is provided with a longitudinal opening (12) corresponding to and communicated with the combustion chamber (11).

9. The actively-cooled double nozzle strut rocket according to claim 8, wherein a transverse coolant inlet channel (2) and a coolant outlet channel (3) are respectively formed at the front and rear sides of the strut rocket head connecting flange (9) at the end far away from the laval nozzle (4), the coolant inlet channel (2) is communicated with the inlet liquid collecting cavity (5), and the coolant outlet channel (3) is communicated with the outlet liquid collecting cavity (6).

10. An actively-cooled double nozzle plate ejector rocket according to claim 9, wherein said coolant inlet channel (2) and inlet plenum (5), said coolant outlet channel (3) and outlet plenum (6) are each in communication via a vertical channel, each of said vertical channels opening into said attachment flange (9).

Technical Field

The invention belongs to the technical field of rocket-based combined cycle engines, and particularly relates to an actively-cooled double-nozzle support plate ejection rocket of a rocket-based combined cycle engine.

Background

A Rocket-Based-Combined-Cycle (RBCC) propulsion system combines a Rocket engine and a ramjet engine in the same flow channel, so that the Rocket engine and the ramjet engine can start the optimal working mode under the conditions of different flight heights and Mach numbers, the respective characteristics of the Rocket engine and the ramjet engine are fully exerted, and the RBCC engine has the advantages of high specific impulse, high thrust-weight ratio, zero-speed starting and reusability. In the rocket-based combined circulating propulsion system, the ejection rocket plays an important role: the injection mode plays roles of injecting air and fuel, generating thrust and igniting; the ignition device mainly plays a role in ignition and flame stabilization in a sub-combustion mode and a super-combustion mode; in the pure rocket mode, the thrust is provided.

At present, two types of commonly used ejector rockets are provided, namely a side-wall type ejector rocket and a central supporting plate type ejector rocket. Due to the configuration, the rocket is embedded into the flow channel in the isolation section, the space for assembling the rocket is very narrow, and the rocket is required to have smaller geometric dimension. The reduction of the size of the rocket also leads the environment of the ejector rocket engine to be worse, the inner wall surface of the rocket engine faces harsh thermal environment, and meanwhile, because the engine isolation section is also subjected to serious pneumatic heating on the outer wall surface, the miniaturization and the bilateral heating environment bring severe technical challenge for the thermal protection of the ejector rocket. The reliable working time of the ejection rocket is one of important influence factors influencing the long-time test and the work of the RBCC engine.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an actively-cooled double-nozzle support plate ejection rocket of a rocket-based combined cycle engine aiming at the defects of the prior art, wherein an outer side cooling channel and an inner side cooling channel are arranged in a support plate ejection rocket body, so that the cooling requirements of the inner side wall surface and the outer side wall surface of the support plate rocket can be met simultaneously, and the long-time work of the support plate ejection rocket is realized.

In order to solve the technical problem, the invention adopts the technical scheme that the actively-cooled double-nozzle support plate ejection rocket of the rocket-based combined cycle engine comprises a support plate ejection rocket body, wherein the support plate ejection rocket body is a solid cuboid and is longitudinally placed in an isolation section of the engine; a vertical combustion chamber is arranged in the support plate ejection rocket body near a short side, and the combustion chamber is a cavity with an opening at the upper end.

Two longitudinal Laval nozzles are arranged on the other short side of the combustion chamber at intervals up and down and communicated with the combustion chamber; each Laval nozzle longitudinally penetrates through the support plate ejection rocket body, and the open end of the Laval nozzle is communicated with the combustion chamber of the RBCC engine.

In the support plate ejection rocket body, an M-shaped cooling channel communicated with each other is formed along one long edge of the support plate ejection rocket body, sequentially winds the outer wall of one side of the Laval nozzle and the outer wall of the combustion chamber for a circle, and sequentially winds the outer wall of the other side of the Laval nozzle and the other long edge of the support plate ejection rocket body; the M-shaped cooling channels are arranged vertically upwards in a layered mode on the support plate ejection rocket body, and the number of each layer is one.

Furthermore, in the support plate ejection rocket body, a long edge of the support plate ejection rocket body is wound on the upper wall or the lower wall of the Laval nozzle close to one side of the long edge, the combustion chamber outer wall is wound for a circle, the Laval nozzle is wound on the upper wall or the lower wall of the Laval nozzle far away from one side of the long edge, cooling channels are formed along the long edge of the support plate ejection rocket body, and each cooling channel is located at the position of the upper wall or the lower wall of the Laval nozzle and between two M-shaped cooling channels at the corresponding position.

Furthermore, a cooling channel arranged along the long edge of the support plate ejection rocket body is an outer side cooling channel; the outer cooling channel is close to the outer wall of the support plate ejection rocket body; an inner side cooling channel is arranged around the outer wall of one side of the Laval nozzle and the outer wall of the combustion chamber in a circle; the end of the inner cooling channel is communicated with the outer cooling channel at the corresponding position.

Furthermore, surface cooling channels are arranged on the upper wall or the lower wall of the Laval nozzle, wherein one end of each surface cooling channel on two sides is communicated with one inner side cooling channel of the combustion chamber section, and the other end of each surface cooling channel on two sides is communicated with the outer side cooling channel on the corresponding side.

Further, the surface cooling channel has a larger inner diameter than the other cooling channels.

Furthermore, an outlet liquid collecting cavity and an inlet liquid collecting cavity which are vertical are correspondingly formed at two vertex angles of a support plate injection rocket body far away from the Laval nozzle; the inlet liquid collecting cavity and the outlet liquid collecting cavity are communicated with the outer side cooling channel on the corresponding side.

Furthermore, the width of the support plate ejection rocket body is smaller than that of the isolation section, and two independent gas flow channels are formed between the support plate ejection rocket body and the front side wall surface and the rear side wall surface of the isolation section.

Furthermore, the upper part of the support plate ejection rocket body is integrally connected with a support plate rocket head connecting flange which is used for being connected with the upper wall of the isolation section and is a solid plate body, and the plate body is provided with a longitudinal hole which corresponds to and is communicated with the position of the combustion chamber.

Furthermore, a transverse coolant inlet channel and a transverse coolant outlet channel are correspondingly formed in the front side and the rear side of one end, far away from the Laval nozzle, of the supporting plate rocket head connecting flange, the coolant inlet channel is communicated with the inlet liquid collecting cavity, and the coolant outlet channel is communicated with the outlet liquid collecting cavity.

Furthermore, the coolant inlet channel and the inlet liquid collecting cavity, the coolant outlet channel and the outlet liquid collecting cavity are respectively communicated through a vertical channel, and each vertical channel is arranged in the connecting flange.

The invention relates to an actively-cooled double-nozzle support plate ejection rocket of a rocket-based combined cycle engine, which has the following advantages: 1. the outer side cooling channel and the inner side cooling channel are arranged, and the cooling requirements of the inner side wall surface and the outer side wall surface of the support plate rocket can be met simultaneously. 2. Due to the arrangement of the liquid collecting cavity, the flow in each cooling channel is uniformly distributed. 3. The upper wall surface and the lower wall surface of the double spray pipes are provided with wider surface cooling channels, so that the double spray pipes can cover the whole upper spray pipe surface and the whole lower spray pipe surface, the flow resistance is reduced due to the increase of the flow channel area, more coolant flow in the channels passing through the upper wall surface and the lower wall surface of the spray pipes is distributed, and the reliable cooling of the wall surfaces between the double spray pipes is ensured. 4. The vertical combustion chamber is arranged, the two spray pipes are perpendicular to and communicated with the combustion chamber, the same rocket head can be shared, and the complexity of a support plate ejection rocket in a direct connection test is reduced.

Drawings

FIG. 1 is a schematic structural view of an actively-cooled dual nozzle plate ejector rocket of a rocket-based combined cycle engine according to the present invention;

FIG. 2 is a schematic view of the arrangement of cooling passages in the present invention;

FIG. 3 is a diagram showing the distribution of flow in each cooling passage in the embodiment;

wherein: 1. the support plate ejects the rocket body; 2. a coolant inlet passage; 3. a coolant outflow channel; 4. a nozzle; 5. an inlet liquid collection chamber; 6. an outlet liquid collection chamber; 7. an outboard cooling channel; 8. an inner cooling channel; 9. the supporting plate rocket head is connected with a flange; 11. a combustion chamber; 12. opening a hole; 13. a surface cooling channel.

Detailed Description

The invention relates to an actively-cooled double-nozzle support plate ejection rocket of a rocket-based combined cycle engine, which comprises a support plate ejection rocket body 1, wherein the support plate ejection rocket body 1 is a solid cuboid and is used for being longitudinally placed in an isolation section of the engine; the width of the support plate ejection rocket body 1 is smaller than that of the isolation section, and two independent gas flow channels are formed with the front side wall surface and the rear side wall surface of the isolation section.

A vertical combustion chamber 11 is arranged in the support plate ejection rocket body 1 near a short side, and the combustion chamber 11 is a cavity with an open upper end.

Two longitudinal Laval nozzles 4 are arranged on the other short side of the combustion chamber 11 at intervals from top to bottom and communicated with the combustion chamber 11; each Laval nozzle 4 longitudinally penetrates through the support plate ejection rocket body 1, and the open end of the Laval nozzle is communicated with a combustion chamber of the RBCC engine.

The combustion chamber 11 is vertically arranged, the laval nozzle 4 is horizontally arranged and is perpendicular to the combustion chamber 11, and the arrangement is defined as a T-shape. The gas after the burning is spout by spray tube 4 to the level, because the wall of injection rocket and outside isolated section wall can face severe thermal environment simultaneously, and parallel double spray tube 4 arrangement scheme makes the thermal environment of the solid region between the double spray tube also very abominable, through setting up cooling channel to realize the cooling.

In the support plate ejection rocket body 1, along one long edge of the support plate ejection rocket body 1, sequentially winding the support plate ejection rocket body along the outer wall of one side of the Laval nozzle 4 and the outer wall of the combustion chamber 11 for a circle, sequentially winding the support plate ejection rocket body along the outer wall of the other side of the Laval nozzle 4 and the other long edge of the support plate ejection rocket body 1, and forming M-shaped cooling channels communicated with each other; the M-shaped cooling channels are arranged in a vertically upward layered mode on the support plate ejection rocket body 1, and the number of each layer is one.

In the support plate ejection rocket body 1, a long edge of the rocket body 1 is ejected along the support plate, then the rocket body is wound on the upper wall or the lower wall of one side, close to the long edge, of the Laval nozzle 4, then the rocket body is wound around the outer wall of the combustion chamber 11 for a circle, then the rocket body is wound on the upper wall or the lower wall of one side, far away from the long edge, of the Laval nozzle 4, then cooling channels are formed along the long edge of the rocket body 1, and each cooling channel is located at the position where the upper wall or the lower wall of the Laval nozzle 4 is located and is located between two M-shaped cooling channels at the corresponding position.

The cooling channel arranged along the long edge of the support plate ejection rocket body 1 is an outer cooling channel 7; the outer cooling channel 7 is close to the outer wall of the support plate ejection rocket body 1;

an inner side cooling channel 8 is arranged around the outer wall of one side of the Laval nozzle 4 and the outer wall of the combustion chamber 11 in a circle; the end of the inside cooling passage 8 communicates with the outside cooling passage 7 at the corresponding position. Surface cooling channels 13 are formed in the upper or lower wall of the laval nozzle 4, wherein one end of each of the surface cooling channels 13 on both sides is connected to an inner cooling channel 8 of the combustion chamber 11, and the other end is connected to the outer cooling channel 7 on the corresponding side. The combustion chamber 11 is cylindrical. The surface cooling channel 13 has a larger inner diameter than the other cooling channels, so that the wall surface of the laval nozzle 4 that is in contact with the fuel gas is more sufficiently cooled.

In order to lead in and lead out a cold source, an outlet liquid collecting cavity 6 and an inlet liquid collecting cavity 5 which are vertical are correspondingly formed at two vertex angles of a nozzle 4 which is far away from a Laval nozzle in a support plate ejection rocket body 1; the inlet and outlet liquid collection chambers 5 and 6 communicate with the outside cooling channels 7 on the respective sides.

As the support plate ejection rocket body 1 is placed in the isolation section of the engine, the upper part of the support plate ejection rocket body is attached to and fixed with the upper part of the isolation section, as shown in figure 2, a support plate rocket head connecting flange 9 is integrally connected to the upper part of the support plate ejection rocket body 1 and is used for being connected with the upper wall of the isolation section, the support plate ejection rocket body is a solid plate body, and a longitudinal hole 12 is formed in the plate body and corresponds to and is communicated with the combustion chamber 11.

The front side and the rear side of one end, far away from the Laval nozzle 4, of the support plate rocket head connecting flange 9 are correspondingly provided with a transverse coolant inlet channel 2 and a transverse coolant outlet channel 3, the coolant inlet channel 2 is communicated with an inlet liquid collecting cavity 5, and the coolant outlet channel 3 is communicated with an outlet liquid collecting cavity 6.

The coolant inlet channel 2 and the inlet liquid collecting cavity 5, the coolant outlet channel 3 and the outlet liquid collecting cavity 6 are respectively communicated through a vertical channel, and each vertical channel is arranged in a supporting plate rocket head connecting flange 9.

When the air-conditioning system works, incoming air enters the isolation section from the air inlet channel. High-temperature gas generated by the head of the rocket ejector enters the combustion chamber 11 along the direction shown by an arrow in figure 1 and is combusted in the combustion chamber 11 to generate high-temperature gas, and the high-temperature gas is sprayed out from the rear end of the Laval nozzle 4 and mixed with incoming air to enter the combustion chamber of the RBCC engine.

The cooling medium of the rocket ejector enters the inlet liquid collecting cavity 5 through the coolant inlet channel 2, the cold source is distributed into the outer side cooling channels 7 through the inlet liquid collecting cavity 5, and the uniform distribution of the cold source at the inlet is guaranteed. The outer side cooling channel 7 is communicated with the inner side cooling channel 8 on one side of the Laval nozzle 4 at the end part to correspondingly introduce cold sources, each outlet end is communicated with the inner side cooling channel 8 on the section of the combustion chamber 11, the end part of the inner side cooling channel 8 on the section of the combustion chamber is communicated with the inner side cooling channel 8 on the other side, then is communicated with the outer side cooling channel 7 on the other side, flows into the outlet liquid collecting cavity 6 and flows out from the coolant outflow channel 3. The front and rear sides close to the upper and lower wall surfaces of each Laval nozzle 4 are respectively provided with a surface cooling channel 13, the left end of the surface cooling channel 13 of each side is communicated with one end of an inner side cooling channel 8 of the combustion chamber 11, and the right end is communicated with the end part of the outer side cooling channel 7 of each corresponding side. The cross section of each surface cooling channel 13 corresponds to half of the cross section of its laval nozzle 4, i.e. the two surface cooling channels 13 cover the entire wall of the nozzle 4.

As shown in fig. 3, an actively-cooled double nozzle plate rocket ejector with 16 cooling passages is selected, and is marked in a manner that a passage 1, a passage 2, … … and a passage 16 are sequentially defined from bottom to top in the vertical direction. The flow distribution uniformity in each cooling channel was numerically calculated and verified by FLUENT calculation software. In order to control the pressure difference between the inlet and the outlet and to ensure the overall cooling effect, the total mass flow of the coolant entering the inlet of the channel 2 is set to 1000g/s, and the results show that the flow in the wider cooling channels at the upper and lower wall surfaces of the laval nozzle is about 70g/s, while the flow in the remaining channels is about 60 g/s. According to the flow calculation result, the overall flow distribution uniformity is good, and meanwhile, the coolant flow distribution on the upper side and the lower side of the double-Laval nozzle 4 is large, so that the reliable thermal protection of the wall surface between the double-nozzle and the upper wall surface and the lower wall surface is facilitated. Meanwhile, the cooling effect is judged, one-dimensional calculation and three-dimensional numerical simulation calculation are carried out on a certain surface cooling channel 13 between the upper wall surface and the lower wall surface of the spray pipe with least flow distribution and severe thermal environment, the temperature of the Laval spray pipe after being cooled by the coolant is obtained by calculating the flowing process of the fluid of the cooling channel and the heat transfer process between the fluid and the shell, and the result shows that the cooling structure can reduce the temperature of the wall of the spray pipe to below the allowable temperature and achieve better cooling effect.