A stratified mixture filling device for a radial flow combustor based on annular split flow of air

Abstract

The present invention belongs to the technical field of combustion organization, and in particular, it is a stratified mixture filling device for a radial flow combustion chamber based on annular split of air flow. Aiming at the problem that the existing combustion mixture filling device is only applicable to an axial flow combustion chamber, the following scheme is proposed. It includes an air flow path structure, a fuel filling structure, a shunt partition plate, a sealing sleeve and a radial flow combustion chamber. One end of the air flow path structure is provided with a connecting flange, and the other end of the air flow path structure is provided with a reduced diameter section. A gas supply pipeline is connected to the connecting flange. The reduced diameter section is matched with the sealing sleeve. An air inlet port is arranged on the reduced diameter section, and threaded holes are uniformly arranged at the bottom of the reduced diameter section. A bottom plate is fixed on the threaded holes. The structure of the present invention is compact and light in weight; it is applicable to the mixture filling of a radial flow combustion chamber, and effectively avoids flashback and thermal self-ignition. The fuel filling structure is detachable and flexible to use, expanding its applicable working condition range.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion organization, and particularly relates to a stratified mixture filling device for a radial flow combustor based on annular splitting of air flow. Background Art

[0002] Modern aeroengines have been developing towards high performance and high efficiency. In recent years, the design of aeroengines based on the traditional constant pressure cycle has reached a very high level, and it is very difficult to further significantly improve the performance of the propulsion system on this basis. As an efficient thermodynamic cycle, the constant volume combustor has the potential to greatly improve the performance of the propulsion system. In addition, effectively shortening the length of the combustor can reduce the overall weight of the engine and also improve the overall performance of the engine. Relevant research shows that for every 2.5 cm reduction in the combustor length, the total weight of the engine will be reduced by 0.4%. The radial flow combustor organizes the air flow radially, effectively reducing the combustor length, and at the same time adopts the constant volume combustion mode, so it has been widely studied in recent years. However, problems such as leakage, thermal ignition, and flashback existing in its combustion organization process limit its research and application progress. There is an urgent need for an effective mixture filling device. The invention patent ZL201621170672.8 discloses a mixture formation device for an internal combustion wave rotor. The device consists of an air inlet end and several different fuel inlet branch pipes. In addition, each fuel branch pipe is equipped with an independent valve connection device connected to the air inlet main pipe to realize the air inlet device of the wave rotor. This air inlet method can achieve good mixing of the fuel gas, but the excessive mixing pipelines further lead to problems such as complex structural devices and cumbersome supply control systems, which are not suitable for scientific research and experimental studies and are only applicable to axial flow combustors. The invention patent CN206177587U proposes a simplified mixture filling device for an internal combustion wave rotor experimental system. It includes an air inlet mixing section, a mixture buffer section, a sealing disk, a port baffle, a wave rotor channel, and a rotating shaft. During the mixture filling process, the port baffle seals the rest of the parts to ensure the safe operation of the wave rotor combustor during the test. However, its overall structural size is relatively large, and it is only applicable to the experimental research of an axial flow simplified single-channel constant volume combustion system. Therefore, we propose a stratified mixture filling device for a radial flow combustor based on annular splitting of air flow. Summary of the Invention

[0003] The purpose of the present invention is to solve the drawback that the existing combustion mixture filling device is only applicable to axial flow combustors, and to propose a stratified mixture filling device for a radial flow combustor based on annular splitting of air flow.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A stratified mixture filling device for a radial flow combustor based on annular split air flow, comprising an air flow path structure, a fuel filling structure, a split partition plate, a sealing sleeve and a radial flow combustor. One end of the air flow path structure is provided with a connecting flange, and the other end is provided with a reduced diameter section. A gas supply pipeline is connected to the connecting flange. The reduced diameter section cooperates with the sealing sleeve. An air inlet port is provided on the reduced diameter section, and threaded holes are uniformly arranged at the bottom of the reduced diameter section. A bottom plate is fixed on the threaded holes. Multiple bolt holes and sunk grooves are provided on the bottom plate. The split partition plate is installed in the sunk groove. An installation hole is provided on the air flow path structure, and the fuel filling structure is installed in the installation hole. An installation groove is provided in the air flow path structure, and the installation groove cooperates with the split partition plate.

[0006] Preferably, the split partition plate, the air inlet port and the air inlet window cooperate with each other.

[0007] Preferably, the fuel filling structure includes a straight pipe section and an L-shaped pipe section. An internal thread is provided at one end of the straight pipe section, and an external thread is provided on the L-shaped pipe section. The internal thread and the external thread cooperate with each other. An installation seat is provided in the installation hole. A compression nut and a conical ring are provided on the straight pipe section. The straight pipe section cooperates with the installation seat. A handle segment is welded on the L-shaped pipe section, and multiple fuel injection holes are provided at the end of the L-shaped pipe section.

[0008] Preferably, the radial flow combustor includes multiple combustor partition plates and multiple combustor channels. The radial flow combustor is provided with Region I, Region III and Region II.

[0009] Preferably, the split partition plate is a thin plate structure with a certain shape.

[0010] Preferably, the L-shaped pipe section cooperates with the radial flow combustor.

[0011] Preferably, the sealing sleeve is made of an elastic wear-resistant material. An air inlet window is provided on the side of the sealing sleeve. The angle of the air inlet window is the same as that of the air inlet port. A screw hole is provided at the bottom of the sealing sleeve, and the screw hole cooperates with the bolt hole.

[0012] In the present invention, the beneficial effects of the stratified mixture filling device for a radial flow combustor based on annular air flow splitting are as follows: The air flow path structure is split into annular air flows by a flow splitting partition plate, and fuel is injected into some of the split air flows, so as to form a stratified mixture distribution in the combustor channel, effectively avoiding flashback and thermal autoignition. In addition, the fuel filling pipeline is designed to be replaceable, which can meet the experimental requirements of a wide operating condition range. At the same time, a sealing sleeve structure is arranged on the air intake device to effectively suppress leakage. By adopting annular air flow splitting, the entire air intake device has a compact structure and light weight; it is applicable to the mixture filling of a radial flow combustor, effectively avoids flashback and thermal autoignition, and makes up for the limitations of the applicable range of the existing technology; the fuel filling structure is detachable and flexible in use, expanding its applicable operating condition range.

[0013] The structure of the present invention is compact and light in weight; it is applicable to the mixture filling of a radial flow combustor, effectively avoids flashback and thermal autoignition, the fuel filling structure is detachable and flexible in use, expanding its applicable operating condition range. Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of a stratified mixture filling device for a radial flow combustor based on annular air flow splitting proposed by the present invention;

[0015] Figure 2 It is a schematic diagram of the structure of the air flow path of a stratified mixture filling device for a radial flow combustor based on annular air flow splitting proposed by the present invention;

[0016] Figure 3 It is a schematic diagram of the fuel filling structure of a stratified mixture filling device for a radial flow combustor based on annular air flow splitting proposed by the present invention;

[0017] Figure 4 It is a schematic diagram of the structure of the sealing sleeve of a stratified mixture filling device for a radial flow combustor based on annular air flow splitting proposed by the present invention;

[0018] Figure 5 It is a schematic diagram of the radial flow combustor and the mixture distribution structure of a stratified mixture filling device for a radial flow combustor based on annular air flow splitting proposed by the present invention.

[0019] In the figure: 1. Air flow path structure; 2. Fuel filling structure; 3. Shunt partition; 4. Sealing sleeve; 5. Radial flow combustion chamber; 6. Connecting flange; 7. Mounting hole; 8. Mounting groove; 9. Reducing section; 10. Intake port; 11. Threaded hole; 12. Bottom plate; 13. Bolt hole; 14. Sunk groove; 15. Straight pipe section; 16. L-shaped pipe section; 17. Internal thread; 18. External thread; 19. Mounting seat; 20. Conical ring; 21. Compression nut; 22. Handle segment; 23. Intake window; 24. Screw hole; 25. Combustion chamber partition; 26. Combustion chamber channel; 27. Region I; 28. Region III; 29. Region II. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0021] Refer to Figure 1 - Figure 2 , a stratified mixture filling device for a radial flow combustion chamber based on annular split of air flow, comprising an air flow path structure 1, a fuel filling structure 2, a shunt partition 3, a sealing sleeve 4 and a radial flow combustion chamber 5. One end of the air flow path structure 1 is provided with a connecting flange 6, and the other end of the air flow path structure 1 is provided with a reducing section 9. A gas supply pipeline is connected to the connecting flange 6. The reducing section 9 is matched with the sealing sleeve 4. An intake port 10 is arranged on the reducing section 9. Threaded holes 11 are uniformly arranged at the bottom of the reducing section 9. A bottom plate 12 is fixed on the threaded holes 11. A plurality of bolt holes 13 and sunk grooves 14 are arranged on the bottom plate 12. The shunt partition 3 is installed in the sunk groove 14. Mounting holes 7 are formed in the air flow path structure 1, and the fuel filling structure 2 is installed in the mounting holes 7.

[0022] Refer to Figure 3 , the fuel filling structure 2 includes a straight pipe section 15 and an L-shaped pipe section 16. An internal thread 17 is arranged at one end of the straight pipe section 15, and an external thread 18 is arranged on the L-shaped pipe section 16. The internal thread 17 and the external thread 18 are matched with each other. A mounting seat 19 is arranged in the mounting hole 7. A compression nut 21 and a conical ring 20 are arranged on the straight pipe section 15. The straight pipe section 15 is matched with the mounting seat 19. A handle segment 22 is welded on the L-shaped pipe section 16, and a plurality of fuel injection holes are arranged at the end of the L-shaped pipe section 16.

[0023] Refer to Figure 4 , the sealing sleeve 4 is made of an elastic wear-resistant material. An intake window 23 is arranged on the side surface of the sealing sleeve 4. The angle of the intake window 23 is the same as that of the intake port 10. A screw hole 24 is arranged at the bottom of the sealing sleeve 4. The screw hole 24 is matched with the bolt hole 13 for the installation and positioning of the sealing sleeve 4.

[0024] Refer to Figure 1, the flow splitting partition 3 is a thin plate structure with a certain shape and is not limited to the currently disclosed structure. Its specific shape is determined by the working requirements of the radial flow combustion chamber 5. The currently disclosed structure is that the radial flow combustion chamber 5 experiences two cycle circulations during one rotation. Therefore, two flow splitting partitions 3 are provided, and there are also two intake ports 10 on the air flow path structure 1 and two intake windows 23 on the sealing sleeve 4.

[0025] Refer to Figure 5 , the radial flow combustion chamber 5 includes a plurality of combustion chamber partitions 25 and a plurality of combustion chamber channels 26. The radial flow combustion chamber 5 is provided with a region Ⅰ 27, a region Ⅲ 28, and a region Ⅱ 29. The radial flow combustion chamber 5 is composed of independent combustion chamber channels 26 divided by a series of combustion chamber partitions 25. The combustion chamber partitions 25 are not limited to the straight type shown in the figure and can also be curved; under the drive of external force or aerodynamic force, the combustion chamber channels 26 rotate past the intake window 23, successively pass through the air flow channels divided by the flow splitting partition 3, and finally form a stratified mixture distribution in the combustion chamber channels 26. Among them, the region Ⅰ 27 and the region Ⅲ 28, and the region Ⅱ 29 are combustible mixtures. The region Ⅰ 27 is used to isolate the mixture between the high-temperature gas and the intake device after ignition in the combustion chamber to prevent flashback. The region Ⅲ 28 is used to isolate the residual gas in the combustion chamber channel 26 in the previous cycle from the combustible mixture filled in the current cycle to avoid thermal ignition.

[0026] Refer to Figure 1 - Figure 3 , the L-shaped pipe section 16 cooperates with the radial flow combustion chamber 5. According to the different working states of the radial flow combustion chamber 5, the L-shaped pipe section 16 of the fuel filling structure 2 can be replaced to meet the matching requirements in a wide range of working conditions.

[0027] Refer to Figure 1 - Figure 4 , the flow splitting partition 3, the intake port 10, and the intake window 23 cooperate with each other.

[0028] Refer to Figure 2 , an installation groove 8 is provided in the air flow path structure 1, and the installation groove 8 cooperates with the flow splitting partition 3.

[0029] In this embodiment, one end of the air flow path structure 1 is provided with a connecting flange 6 for connecting the air supply pipeline, and the other end is provided with a reduced-diameter section 9 for installing the sealing sleeve 4. An air inlet port 10 is arranged on the reduced-diameter section 9, and threaded holes 11 are uniformly arranged at the bottom of the reduced-diameter section 9 for fixing the bottom plate 12. Bolt holes 13 are arranged on the bottom plate 12 corresponding to the threaded holes 11. At the same time, a counterbore 14 is arranged on the bottom plate 12 for assisting in installing the flow dividing partition 3. An installation hole 7 for the fuel filling structure 2 is opened on the outer side of the side wall of the air flow path structure 1, and an installation groove 8 for the flow dividing partition 3 is arranged on the inner side. The flow dividing partition 3 is inserted into the counterbore 14 on the bottom plate 12 and fixed by welding, and then together with the bottom plate 12 is inserted into the installation groove 8 on the inner side of the side wall of the air flow path structure 1. At this time, the flow dividing partition 3 divides the air flow into strands in a ring shape. The sealing sleeve 4 is sleeved on the reduced-diameter section 9 of the air flow path structure 1, and screws are sequentially passed through the screw holes 24 and bolt holes 13 and screwed into the threaded holes 11, thus completing the installation and positioning of the combined structure of the air flow path structure 1, the flow dividing partition 3 and the sealing sleeve 4. The mounting seat 19 is inserted into the installation hole 7 on the side wall of the air flow path structure 1 and fixed by welding. Then, the straight pipe section 15 of the fuel filling structure 2 sequentially passes through the compression nut 21, the tapered ring 20 and the mounting seat 19 and enters the interior of the air flow path structure 1. Hold the handle section 22 on the L-shaped pipe section 16 of the fuel filling structure 2, insert the L-shaped pipe section 16 into the air flow path structure 1, adjust its position, and rotate the straight pipe section 15 so that the internal thread 17 on the straight pipe section 15 is tightly matched with the external thread 18 on the L-shaped pipe section 16. Finally, tighten the compression nut 21. Under the action of the compression nut 21, the outer conical surface of the tapered ring 20 receives the directional force from the inner conical surface of the mounting seat 19, and its radial component forces the tapered ring 20 to deform inward, thereby tightly fixing the straight pipe section 15, combining the fuel filling structure 2 with the air flow path structure 1 into a whole. A series of fuel spray holes are arranged at the end of the L-shaped pipe section 16 according to requirements, and fuel is sprayed into the air flow path structure 1 to be mixed with air to form a combustible premixed gas. Driven by external force or aerodynamic force, the combustion chamber passage 26 rotates past the air inlet window 23 and sequentially passes through the air flow channels divided by the flow dividing partition 3, and finally a stratified mixture distribution is formed in the combustion chamber passage 26. Among them, regions Ⅰ27 and Ⅲ28, and region Ⅱ29 are combustible mixtures. Region Ⅰ27 is used to isolate the mixture between the high-temperature gas and the intake device after ignition in the combustion chamber to prevent flashback, and region Ⅲ28 is used to isolate the residual gas in the combustion chamber passage 26 in the previous cycle from the combustible mixture filled in the current cycle to avoid thermal spontaneous combustion. It has a wide range of applicability and is safe to use.

[0030] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A stratified mixture filling device for a radial flow combustor based on annular split of air flow, comprising an air flow path structure (1), a fuel filling structure (2), a split partition plate (3), a sealing sleeve (4) and a radial flow combustor (5), characterized in that, One end of the air flow path structure (1) is provided with a connecting flange (6), and the other end of the air flow path structure (1) is provided with a reduced-diameter section (9). A gas supply pipeline is connected to the connecting flange (6). The reduced-diameter section (9) is matched with a sealing sleeve (4). An air inlet port (10) is provided on the reduced-diameter section (9). Threaded holes (11) are uniformly arranged at the bottom of the reduced-diameter section (9). A bottom plate (12) is fixed on the threaded holes (11). A plurality of bolt holes (13) and a counterbore (14) are provided on the bottom plate (12). The flow dividing partition plate (3) is installed in the counterbore (14). An installation hole (7) is formed on the air flow path structure (1), and the fuel filling structure (2) is installed in the installation hole (7); The radial flow combustion chamber (5) includes a plurality of combustion chamber partition plates (25) and a plurality of combustion chamber channels (26). The radial flow combustion chamber (5) is composed of a series of independent combustion chamber channels (26) divided by the combustion chamber partition plates (25); The flow dividing partition plate (3) divides the air flow in the air flow path structure (1) into annular air streams, and fuel is injected into some of the divided air streams. The combustion chamber channel (26) rotates past the air inlet port (10), so as to form a stratified mixture distribution in the combustion chamber channel (26).

2. The stratified mixture filling device for a radial flow combustor based on annular air flow splitting according to claim 1, characterized in that, The fuel filling structure (2) includes a straight pipe section (15) and an L-shaped pipe section (16). An internal thread (17) is provided at one end of the straight pipe section (15), and an external thread (18) is provided on the L-shaped pipe section (16). The internal thread (17) and the external thread (18) are matched with each other. An installation seat (19) is arranged in the installation hole (7). A compression nut (21) and a tapered ring (20) are provided on the straight pipe section (15). The straight pipe section (15) is matched with the installation seat (19). A handle section (22) is welded on the L-shaped pipe section (16), and a plurality of fuel injection holes are arranged at the end of the L-shaped pipe section (16).

3. A stratified mixture filling device for a radial flow combustor based on annular split of air flow according to claim 1, characterized in that, The sealing sleeve (4) is made of an elastic wear-resistant material. An air inlet window (23) is provided on the side surface of the sealing sleeve (4). The angle of the air inlet window (23) is the same as that of the air inlet port (10). A screw hole (24) is provided at the bottom of the sealing sleeve (4), and the screw hole (24) is matched with the bolt hole (13).

4. A stratified mixture filling device for a radial flow combustor based on annular air flow splitting according to claim 1, characterized in that, The flow dividing partition plate (3) is a thin plate structure with a certain shape.

5. A stratified mixture filling device for a radial flow combustor based on annular split of air flow according to claim 1, characterized in that, A stratified mixture distribution is formed in the combustion chamber channel (26). Region II (29) is a combustible mixture. Region I (27) is used to isolate the mixture between the high-temperature gas and the intake device after the combustion chamber is ignited to prevent flashback. Region III (28) is used to isolate the residual gas in the combustion chamber channel (26) in the previous cycle from the combustible mixture filled in the current cycle.

6. A stratified mixture filling device for a radial flow combustor based on annular air flow splitting according to claim 2, characterized in that, The L-shaped pipe section (16) is matched with the radial flow combustion chamber (5); according to the different working states of the radial flow combustion chamber (5), the L-shaped pipe section (16) of the fuel filling structure (2) can be replaced to meet the matching requirements of a wide operating condition range.

7. A stratified mixture filling device for a radial flow combustor based on annular airflow splitting according to claim 3, characterized in that, The flow dividing partition plate (3), the air inlet port (10) and the air inlet window (23) are matched with each other.

8. A stratified mixture filling device for a radial flow combustor based on annular air flow splitting according to claim 1, characterized in that, An installation groove (8) is arranged in the air flow path structure (1), and the installation groove (8) is matched with the flow dividing partition plate (3).

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