Multi-head fan-shaped combustion chamber test piece with built-in diffuser

Abstract

The present invention provides a diffuser built-in multi-head fan-shaped combustion chamber test piece, comprising: a force bearing case comprising a plurality of cases, one end of which is connected with an air inlet pipe and the other end of which is connected with an exhaust pipe, and which bears a load and forms a gas flow channel; the air inlet assembly is arranged in the force bearing casing and used for introducing air flow, diffusing pressure and measuring air inlet parameters at the same time; the flame tube assembly is arranged in the force bearing casing and located at the exhaust port of the air inlet assembly, and the flame tube assembly comprises a plurality of flame tube heads and is used for receiving diffusion airflow; and the fuel oil nozzle is connected with the flame tube assembly and sprays fuel oil into the flame tube assembly to be mixed with the diffusion airflow for combustion. The load bearing capacity of the test piece can be improved, the service life of the test piece is effectively prolonged, and the test safety is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature and high-pressure combustion chamber test piece design, and in particular to a multi-head sector-shaped combustion chamber test piece with a diffuser built in. Background Art

[0002] With the development of aviation technology, higher requirements are put forward for the temperature ratio, pressure ratio, thrust-to-weight ratio and combustion efficiency of aircraft engines. As a key component of aircraft engines, the combustion chamber undertakes the important task of converting chemical energy into power, which directly affects the performance of the engine. In the development process of aircraft engines, the combustion chamber of aircraft engines is designed on paper and applied to core engines / whole machine tests. In order to verify the performance indicators of combustion chamber components, such as combustion efficiency, temperature distribution, pressure changes, etc., to ensure that they meet the design requirements, it is necessary to carry out technical verification through single-head combustion chamber tests, multi-head fan-shaped combustion chamber tests, and full-ring combustion chamber tests.

[0003] Among these three tests, the single-head combustion chamber has a simple shape and layout, the combustion process is only carried out in one area, and the distribution of the combustion process in the combustion chamber is not uniform enough. It is generally used for multiple combustion chamber scheme screening, and one or more schemes with better comprehensive performance are selected from multiple schemes, so as to continue to carry out further test verification in the fan-shaped combustion chamber and even the full-ring combustion chamber. In the selection of multi-head fan-shaped combustion chamber and full-ring combustion chamber, although the full-ring combustion chamber test can realize the distribution of the combustion chamber around the entire engine and provide more comprehensive combustion, the structure is more complex and the manufacturing and maintenance costs are higher. Therefore, the multi-head fan-shaped combustion chamber test is more commonly used.

[0004] Chinese invention CN110926823A discloses a high-pressure chamber main combustion chamber sector test piece structure, in which the bearing casing is cylindrical, and the test section including the sector flame tube and the sector casing is placed inside the bearing casing. In the above invention, the mechanical load and test pressure during the combustion test are independently borne by the bearing casing, and the test section body composed of the sector casing and the sector flame tube only bears the function of forming a flow channel, but the design space of the double casing is large, the structure is complex, and the bearing casing as a high-pressure chamber needs to be supplied with high-pressure gas separately, which places high requirements on the test equipment.

[0005] Chinese invention CN110763474A discloses a combustion chamber test device, including a test section and an exhaust measurement section, and a flame tube fixedly arranged inside the casing. However, the upstream extended straight section or the front measurement section of the diffuser of the invention (the flow channel cross-section profile is the same as the diffuser) is in contact with the external environment and is not built into the load-bearing casing. As a load-bearing part, it has great safety hazards of insufficient strength and insufficient rigidity. Summary of the invention

[0006] The object of the present invention is to provide a multi-head sector-shaped combustion chamber test piece with a diffuser built in, so as to solve the above-mentioned problem, improve the load bearing capacity of the test piece, and effectively improve the life of the test piece and the test safety.

[0007] The present invention proposes a multi-head sector-shaped combustion chamber test piece with a diffuser built-in, comprising:

[0008] The load-bearing casing includes several casings, one end of which is connected to the air inlet pipe and the other end is connected to the exhaust pipe, which bears the load and forms a gas flow path;

[0009] An air intake assembly is arranged in the load-bearing casing, introduces airflow and performs pressure expansion, and measures air intake parameters at the same time;

[0010] A flame tube assembly is arranged in the load-bearing casing, located at the exhaust port of the air intake assembly, and includes a plurality of flame tube heads for receiving a pressure-expanding airflow;

[0011] A fuel nozzle is connected to the flame tube assembly and sprays the fuel into the flame tube assembly to mix with the diffuser airflow for combustion.

[0012] In one embodiment, the load-bearing casing includes a first transition casing, an air bleed section casing, a test section casing, a measurement section casing and a second transition casing;

[0013] One end of the first transfer casing is connected to the air intake pipe, and the other end is connected to one end of the air bleed section casing, the other end of the air bleed section casing is connected to one end of the test section casing, the other end of the test section casing is connected to one end of the measuring section casing, the other end of the measuring section casing is connected to one end of the second transfer casing, and the other end of the second transfer casing is connected to the exhaust pipe;

[0014] The cross-section of the first adapter casing gradually decreases from one end connected to the air intake pipe to the other end connected to the air bleed section casing, the cross-sections of the air bleed section casing, the test section casing and the measuring section casing remain unchanged along the axial direction, and the cross-section of the second adapter casing gradually increases from one end connected to the measuring section casing to the other end connected to the exhaust pipe.

[0015] In one embodiment, the cross-sections of the air bleed section casing and the test section casing are both fan-shaped;

[0016] The air bleed section casing comprises a first outer ring casing, a first inner ring casing and two first side casings, the first outer ring casing and the first inner ring casing are both arc-shaped, the arc radius of the first outer ring casing is greater than the arc radius of the first inner ring casing, and the two first side casings are both semicircular, respectively connecting the two ends of the first outer ring casing and the first inner ring casing, and forming a closed pipeline with the first outer ring casing and the first inner ring casing;

[0017] The test section casing includes a second outer ring casing, a second inner ring casing and two second side casings. The second outer ring casing and the second inner ring casing are both arc-shaped. The arc radius of the second outer ring casing is larger than the arc radius of the second inner ring casing. The two second side casings are both semicircles, which respectively connect the two ends of the second outer ring casing and the second inner ring casing, and form a closed pipeline with the second outer ring casing and the second inner ring casing.

[0018] In one embodiment, the air intake assembly includes a rectification pipe and a pressure diffuser pipe, the rectification pipe is arranged inside the air bleed section casing, and the pressure diffuser pipe is arranged inside the test section casing.

[0019] In one embodiment, the rectification pipeline includes an inlet baffle, a rectification tube and a mounting plate;

[0020] The inlet baffle includes two horizontal plates and two vertical plates. The two horizontal plates face the first outer ring casing and the first inner ring casing respectively, and have a gap G1 between the first outer ring casing and the first inner ring casing respectively. The two vertical plates are connected to the horizontal plates at one end and connected to one end of the rectifier tube at the other end. The other end of the rectifier tube is connected to the mounting plate. The cross-section of the rectifier tube remains unchanged along the axial direction, and the mounting plate is bolted to the diffuser pipe.

[0021] In one embodiment, the cross section of the rectifier tube is fan-shaped, and includes an outer ring rectifier plate, an inner ring rectifier plate and two side rectifier plates;

[0022] The outer ring rectifying plate and the inner ring rectifying plate are both arc-shaped, and the arc radius of the outer ring rectifying plate is greater than the arc radius of the inner ring rectifying plate;

[0023] The two side rectifying plates are respectively connected to two ends of the outer ring rectifying plate and the inner ring rectifying plate, and extend in a radial direction to be connected to the first outer ring casing and the first inner ring casing.

[0024] In one embodiment, the pressure diffuser pipe includes a fixing plate, a flow guide pipe, a flow diffuser pipe and a cone wall;

[0025] Two ends of the fixing plate are respectively connected with the second outer ring casing and the second inner ring casing by bolts;

[0026] One end of the flow guide pipe is connected to the fixing plate, and the other end is connected to one end of the flow expansion pipe, and the cross section of the flow guide pipe remains unchanged along the axial direction;

[0027] The other end of the flow diffuser is toward the flame tube assembly, and the cross section of the flow diffuser gradually increases from the end connected to the guide tube to the other end toward the flame tube assembly, so as to expand the airflow and guide the expanded airflow into the flame tube assembly;

[0028] The conical wall is circumferentially arranged around the outer wall of the diffuser tube and is close to the second outer ring casing and the second inner ring casing, and has a gap G2 between the conical wall and the second outer ring casing and the second inner ring casing respectively.

[0029] In one embodiment, the guide tube has a fan-shaped cross section and includes an outer ring guide plate, an inner ring guide plate and two side guide plates;

[0030] The outer ring guide plate and the inner ring guide plate are both arc-shaped, and the arc radius of the outer ring guide plate is greater than the arc radius of the inner ring guide plate;

[0031] The two side guide plates are respectively connected to two ends of the outer ring guide plate and the inner ring guide plate, and extend in a radial direction to be connected to the second outer ring casing and the second inner ring casing.

[0032] In one embodiment, the flame tube assembly further includes a flame tube outer wall, a flame tube inner wall and two flame tube side walls;

[0033] The outer wall of the flame tube and the inner wall of the flame tube are both arc-shaped, and the arc radius of the outer wall of the flame tube is greater than the arc radius of the inner wall of the flame tube;

[0034] The two flame tube side walls are respectively connected to the two ends of the flame tube outer wall and the flame tube inner wall, and extend in the radial direction to be connected to the second outer ring casing and the second inner ring casing;

[0035] The flame tube heads are evenly arranged along the circumference of the flame tube assembly.

[0036] In one embodiment, the multi-head sector combustion chamber test piece built into the diffuser further includes an ignition nozzle and a pulsating pressure sensing portion, and the ignition nozzle and the pulsating pressure sensing portion are both arranged on the second outer ring casing;

[0037] The ignition nozzle is installed on the head of the flame tube in the middle position and is used to ignite the fuel and expand the air flow;

[0038] The pulsating pressure sensing parts are respectively installed on the flame tube heads at non-middle positions and are used to measure the dynamic pressure of the gas during combustion.

[0039] Compared with the prior art, the multi-head sector combustion chamber test piece with built-in diffuser of the present invention has the following beneficial effects:

[0040] 1) In the present invention, the diffuser and the fan-shaped flame tube are built into the load-bearing casing, and only have the function of forming a flow channel. They are not affected by external loads. The aerodynamic characteristics of the internal flow channel can better simulate the aerodynamic characteristics of the annular combustion chamber of an aircraft engine under typical working conditions. At the same time, the load bearing capacity of the test piece can be improved, and the life of the test piece and the test safety can be effectively improved.

[0041] 2) The present invention can better verify the performance indicators of combustion chamber components, such as combustion efficiency, temperature distribution, pressure change, etc., to ensure that they meet the design requirements; evaluate the stability and reliability of combustion chamber components under various working conditions; understand the changes in various parameters during the combustion process, thereby helping to optimize the design of the combustion chamber, accelerate the development of models, improve design defects, and improve combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the meridian structure of a multi-head sector-shaped combustion chamber test piece built into a diffuser according to an embodiment of the present invention;

[0043] Figure 2 for Figure 1 Enlarged view of M in the middle;

[0044] Figure 3 for Figure 2 Middle AA section view;

[0045] Figure 4 It is a schematic diagram of the structure of a rectifying duct in a multi-head sector-shaped combustion chamber test piece built into a diffuser according to an embodiment of the present invention;

[0046] Figure 5 It is a schematic structural diagram of a diffuser pipe in a multi-head sector-shaped combustion chamber test piece built into a diffuser according to an embodiment of the present invention;

[0047] Figure 6 for Figure 2 Middle BB section view;

[0048] Figure 7 for Figure 2 Middle CC section view.

[0049] Reference numerals

[0050] 1. Intake pipe, 10. First cavity, 2. Exhaust pipe, 20. Second cavity, 31. First transfer casing, 32. Bleeding section casing, 321. First outer ring casing, 322. First inner ring casing, 323. First side casing, 33. Test section casing, 331. Second outer ring casing, 332. Second inner ring casing, 333. Second side casing, 34. Measuring section casing, 35. Second transfer casing, 4. Fuel nozzle, 5. Flame tube assembly, 50. Combustion cavity, 51. Flame tube outer wall, 52. Flame tube inner wall, 53. Flame tube side wall, 61. Ignition nozzle, 62. Pulsating pressure sensing part, 7. Intake assembly, 71. Rectifier tube , 711, inlet baffle, 712, rectifier tube, 7121, outer ring rectifier plate, 7122, inner ring rectifier plate, 7123, side rectifier plate, 713, mounting plate, 72, pressure diffuser pipe, 721, fixing plate, 722, guide tube, 7221, outer ring guide plate, 7222, inner ring guide plate, 7223, side guide plate, 723, diffuser tube, 724, cone wall, P, air intake cavity, V1, third cavity, V2, fourth cavity, V3, fifth cavity, V4, sixth cavity, G1, gap between inlet baffle and first outer ring casing and first inner ring casing, G2, gap between cone wall and second outer ring casing and second inner ring casing. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the specific embodiments described herein are used to help understand the present invention, but do not constitute a limitation of the present invention.

[0052] The present invention proposes a multi-head sector combustion chamber test piece with a diffuser built in, comprising a load-bearing casing, an air intake assembly 7, a flame tube assembly 5 and a fuel nozzle 4, see Figure 1 . The load-bearing casing is composed of a plurality of casings arranged in an arrangement, one end of which is connected to the air intake pipe 1, and the other end is connected to the exhaust pipe 2. The air intake assembly 7 is arranged in the load-bearing casing, and is used to introduce airflow and perform pressure diffusion. At the same time, the air intake parameters can be measured by measuring elements such as built-in sensors. The flame tube assembly 5 is arranged in the load-bearing casing and is located at the exhaust port of the air intake assembly 7, that is, the air intake assembly 7 is located upstream of the flame tube assembly 5. The flame tube assembly 5 includes a plurality of flame tube heads for receiving the pressure diffusion airflow. The fuel nozzle 4 is connected to the flame tube assembly 5, and sprays the fuel into the flame tube assembly 5 to mix with the pressure diffusion airflow for combustion.

[0053] The inner flow passage of the intake pipe 1 forms a first cavity 10 for conveying intake air. The flame tube assembly 5 forms a combustion cavity 50, and the fuel injected from the fuel nozzle 4 and the diffuser airflow from the intake assembly 7 are burned in the combustion cavity 50. The inner flow passage of the exhaust pipe 2 forms a second cavity 20 for outputting the combusted gas.

[0054] The load-bearing casing serves as a load-bearing component to bear the load and form a gas flow path, and the air intake assembly 7 and the flame tube assembly 5 only serve as flow path structural components.

[0055] The following is a detailed description of each component of the multi-head sector-shaped combustion chamber test piece built into the diffuser mentioned above.

[0056] The load-bearing casing of one embodiment of the present invention comprises a first transition casing 31 , an air bleed section casing 32 , a test section casing 33 , a measurement section casing 34 and a second transition casing 35 .

[0057] One end of the first adapter casing 31 is connected to the air intake pipe 1, and the other end is connected to one end of the air bleed section casing 32, the other end of the air bleed section casing 32 is connected to one end of the test section casing 33, the other end of the test section casing 33 is connected to one end of the measuring section casing 34, the other end of the measuring section casing 34 is connected to one end of the second adapter casing 35, and the other end of the second adapter casing 35 is connected to the exhaust pipe 2;

[0058] The cross-section of the first adapter casing 31 gradually decreases from one end connected to the air intake pipe 1 to the other end connected to the air bleed section casing 32, the cross-sections of the air bleed section casing 32, the test section casing 33 and the measuring section casing 34 remain unchanged along the axial direction, and the cross-section of the second adapter casing 35 gradually increases from one end connected to the measuring section casing 34 to the other end connected to the exhaust pipe 2.

[0059] like Figure 3 , Figure 6 , Figure 7 As shown, the cross-sections of the air bleed section casing 32 and the test section casing 33 of one embodiment of the present invention are both fan-shaped.

[0060] The air bleed section casing 32 includes a first outer ring casing 321, a first inner ring casing 322 and two first side casings 323. The first outer ring casing 321 and the first inner ring casing 322 are both arc-shaped, and the arc radius of the first outer ring casing 321 is greater than the arc radius of the first inner ring casing 322. The two first side casings 323 are both semicircular, respectively connecting the two ends of the first outer ring casing 321 and the first inner ring casing 322, and forming a closed pipeline with the first outer ring casing 321 and the first inner ring casing 322.

[0061] The test section casing 33 includes a second outer ring casing 331, a second inner ring casing 332 and two second side casings 333. The second outer ring casing 331 and the second inner ring casing 332 are both arc-shaped, and the arc radius of the second outer ring casing 331 is greater than the arc radius of the second inner ring casing 332. The two second side casings 333 are both semicircular, respectively connecting the two ends of the second outer ring casing 331 and the second inner ring casing 332, and forming a closed pipeline with the second outer ring casing 331 and the second inner ring casing 332.

[0062] like Figure 2 As shown, an air intake assembly 7 according to an embodiment of the present invention includes a rectifying duct 71 and a pressure diffuser duct 72 . The rectifying duct 71 is arranged inside the air inlet section casing 32 , and the pressure diffuser duct 72 is arranged inside the test section casing 33 .

[0063] like Figure 4 As shown, the rectifying duct 71 of one embodiment of the present invention includes an inlet baffle 711, a rectifying tube 712 and a mounting plate 713. The inlet baffle 711 includes two horizontal plates and two vertical plates, the two horizontal plates facing the first outer ring casing 321 and the first inner ring casing 322 respectively, and a certain installation gap G1 is provided between the two horizontal plates and the first outer ring casing 321 and the first inner ring casing 322 respectively, so as to ensure that the rectifying duct 71 can be smoothly installed inside the air bleed section casing 32, but this gap G1 must be small enough. The two vertical plates are connected to the horizontal plate at one end and to one end of the rectifying tube 712 at the other end. The other end of the rectifying tube 712 is connected to the mounting plate 713, and the cross section of the rectifying tube 712 remains unchanged along the axial direction, and the mounting plate 713 is bolted to the pressure diffuser duct 72.

[0064] like Figure 7 As shown, the cross section of the rectifier tube 712 of one embodiment of the present invention is fan-shaped, and includes an outer ring rectifier plate 7121, an inner ring rectifier plate 7122 and two side rectifier plates 7123. The outer ring rectifier plate 7121 and the inner ring rectifier plate 7122 are both arc-shaped, and the arc radius of the outer ring rectifier plate 7121 is greater than the arc radius of the inner ring rectifier plate 7122. The two side rectifier plates 7123 are respectively connected to the two ends of the outer ring rectifier plate 7121 and the inner ring rectifier plate 7122, and extend in the radial direction to connect with the first outer ring casing 321 and the first inner ring casing 322.

[0065] The outer ring rectifying plate 7121, the first outer ring casing 321 and the rectifying plates 7123 on both sides form a third volume cavity V1, and the inner ring rectifying plate 7122, the first inner ring casing 322 and the rectifying plates 7123 on both sides form a fourth volume cavity V2.

[0066] like Figure 5 As shown, a pressure diffuser pipe 72 according to an embodiment of the present invention includes a fixing plate 721 , a flow guide pipe 722 , a flow diffuser 723 and a cone wall 724 .

[0067] The two ends of the fixed plate 721 are respectively connected with the second outer ring casing 331 and the second inner ring casing 332 by bolts, and the connection needs to be sealed to prevent the air in the first chamber 10 from leaking from the connection to the combustion chamber 50. The mounting plate 713 of the rectifying duct 71 is also fixed to the fixed plate 721 by bolts, so as to be connected with the diffuser duct 72. One end of the guide tube 722 is connected to the fixed plate 721, and the other end is connected to one end of the diffuser 723, and the cross section of the guide tube 722 remains unchanged along the axial direction. The other end of the diffuser 723 faces the flame tube assembly 5, and the cross section of the diffuser 723 gradually increases from one end connected to the guide tube 722 to the other end facing the flame tube assembly 5, so as to diffuse the airflow and introduce the diffused airflow into the flame tube assembly 5. The conical wall 724 is circumferentially arranged around the outer wall of the diffuser tube 723 and is close to the second outer ring casing 331 and the second inner ring casing 332, and has a certain installation gap G2 between the second outer ring casing 331 and the second inner ring casing 332 respectively. This is to ensure that the diffuser pipe 72 can be smoothly installed inside the test section casing 33, but this gap G2 must be small enough to simulate the real combustion chamber as much as possible.

[0068] The inner flow passages of the rectifying tube 712 and the guide tube 722 form an air intake chamber P for rectifying and conveying gas. The connection between the mounting plate 713 and the fixing plate 721 needs to be sealed to prevent the air in the third chamber V1 and the fourth chamber V2 from leaking into the air intake chamber P from the connection.

[0069] like Figure 6 As shown, the cross section of the guide tube 722 of one embodiment of the present invention is fan-shaped, and includes an outer ring guide plate 7221, an inner ring guide plate 7222 and two side guide plates 7223. The outer ring guide plate 7221 and the inner ring guide plate 7222 are both arc-shaped, and the arc radius of the outer ring guide plate 7221 is greater than the arc radius of the inner ring guide plate 7222. The two side guide plates 7223 are respectively connected to the two ends of the outer ring guide plate 7221 and the inner ring guide plate 7222, and extend in the radial direction to connect with the second outer ring casing 331 and the second inner ring casing 332.

[0070] The outer ring guide plate 7221, the second outer ring casing 331 and the guide plates 7223 on both sides form a fifth cavity V3, and the inner ring guide plate 7222, the second inner ring casing 332 and the guide plates 7223 on both sides form a sixth cavity V4.

[0071] like Figure 3As shown, a flame tube assembly 5 of an embodiment of the present invention further includes a flame tube outer wall 51, a flame tube inner wall 52 and two flame tube side walls 53. The flame tube outer wall 51 and the flame tube inner wall 52 are both arc-shaped, and the arc radius of the flame tube outer wall 51 is greater than the arc radius of the flame tube inner wall 52. The two flame tube side walls 53 are respectively connected to the two ends of the flame tube outer wall 51 and the flame tube inner wall 52, and extend in the radial direction to connect with the second outer ring casing 331 and the second inner ring casing 332. The flame tube heads are evenly arranged along the circumference of the flame tube assembly 5.

[0072] The diffuser-built-in multi-head sector combustion chamber test piece of one embodiment of the present invention further includes an ignition nozzle 61 and a pulsating pressure sensing portion 62, both of which are arranged on the second outer ring casing 331. The ignition nozzle 61 is installed on the flame tube head at the middle position, and is used to ignite the fuel and diffuse the airflow. The pulsating pressure sensing portion 62 is respectively installed on the flame tube heads at non-middle positions, and is used to measure the dynamic pressure of the gas during combustion. Figure 3 5 flame tube heads and 4 pulsating pressure sensing parts 62 are shown in the figure. The ignition nozzle 61 faces the center of the flame tube head in the middle position, and the 4 pulsating pressure sensing parts 62 face the centers of the other 4 flame tube heads respectively. Of course, the number of flame tube heads and the number of pulsating pressure sensing parts 62 can be adjusted according to actual conditions.

[0073] It should be noted that the orientations or positional relationships indicated by the terms "inside" and "outside" are all based on the orientations or positional relationships shown in the drawings. Such expressions are only intended to make the description of the present invention simpler and more convenient, and do not indicate or imply that the referred parts must have a specific orientation or be constructed and operated in a specific orientation.

[0074] In addition, in this application, unless otherwise clearly specified and limited, the terms such as "installation", "connection", "setting" and the like should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Those skilled in the art can understand the specific meanings of the above terms in this application according to the specific circumstances. In addition, the terms "first", "second", "third", "fourth", "fifth", and "sixth" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0075] The present invention has the following beneficial effects:

[0076] 1) In the present invention, the diffuser and the fan-shaped flame tube are built into the load-bearing casing, and only have the function of forming a flow channel. They are not affected by external loads. The aerodynamic characteristics of the internal flow channel can better simulate the aerodynamic characteristics of the annular combustion chamber of an aircraft engine under typical working conditions. At the same time, the load bearing capacity of the test piece can be improved, and the life of the test piece and the test safety can be effectively improved.

[0077] 2) The present invention can better verify the performance indicators of combustion chamber components, such as combustion efficiency, temperature distribution, pressure change, etc., to ensure that they meet the design requirements; evaluate the stability and reliability of combustion chamber components under various working conditions; understand the changes in various parameters during the combustion process, thereby helping to optimize the design of the combustion chamber, accelerate the development of models, improve design defects, and improve combustion efficiency.

[0078] The above-described embodiments are only further explanations of the present invention, and are not intended to limit the present invention in other forms. The present invention may also have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding modifications and changes according to the present invention, but these corresponding modifications and changes should all fall within the protection scope of the present invention.

Claims

1. A multi-headed sector combustion chamber test piece with a built-in diffuser, It is characterized in that include: The load-bearing casing includes several casings, one end of which is connected to the air inlet pipe and the other end is connected to the exhaust pipe, which bears the load and forms a gas flow path; An air intake assembly is arranged in the load-bearing casing, introduces airflow and performs pressure expansion, and measures air intake parameters at the same time; A flame tube assembly is arranged in the load-bearing casing, located at the exhaust port of the air intake assembly, and includes a plurality of flame tube heads for receiving a pressure-expanding airflow; A fuel nozzle is connected to the flame tube assembly and sprays the fuel into the flame tube assembly to mix with the diffuser airflow for combustion.

2. The diffuser-embedded multi-head sector combustion chamber test piece according to claim 1, It is characterized in that The load-bearing casing includes a first transition casing, an air bleed section casing, a test section casing, a measurement section casing and a second transition casing; One end of the first transfer casing is connected to the air intake pipe, and the other end is connected to one end of the air bleed section casing, the other end of the air bleed section casing is connected to one end of the test section casing, the other end of the test section casing is connected to one end of the measuring section casing, the other end of the measuring section casing is connected to one end of the second transfer casing, and the other end of the second transfer casing is connected to the exhaust pipe; The cross-section of the first adapter casing gradually decreases from one end connected to the air intake pipe to the other end connected to the air bleed section casing, the cross-sections of the air bleed section casing, the test section casing and the measuring section casing remain unchanged along the axial direction, and the cross-section of the second adapter casing gradually increases from one end connected to the measuring section casing to the other end connected to the exhaust pipe.

3. The diffuser-embedded multi-head sector combustion chamber test piece according to claim 2, It is characterized in that The cross sections of the air bleed section casing and the test section casing are both fan-shaped; The air bleed section casing comprises a first outer ring casing, a first inner ring casing and two first side casings, the first outer ring casing and the first inner ring casing are both arc-shaped, the arc radius of the first outer ring casing is greater than the arc radius of the first inner ring casing, and the two first side casings are both semicircular, respectively connecting the two ends of the first outer ring casing and the first inner ring casing, and forming a closed pipeline with the first outer ring casing and the first inner ring casing; The test section casing includes a second outer ring casing, a second inner ring casing and two second side casings. The second outer ring casing and the second inner ring casing are both arc-shaped. The arc radius of the second outer ring casing is larger than the arc radius of the second inner ring casing. The two second side casings are both semicircles, which respectively connect the two ends of the second outer ring casing and the second inner ring casing, and form a closed pipeline with the second outer ring casing and the second inner ring casing.

4. The diffuser-embedded multi-head sector combustion chamber test piece according to claim 3, It is characterized in that The air intake assembly includes a rectifying pipe and a pressure diffuser pipe. The rectifying pipe is arranged inside the air inlet section casing, and the pressure diffuser pipe is arranged inside the test section casing.

5. The diffuser-embedded multi-head sector combustion chamber test piece according to claim 4, It is characterized in that The rectifier pipeline includes an inlet baffle, a rectifier tube and a mounting plate; The inlet baffle includes two horizontal plates and two vertical plates. The two horizontal plates face the first outer ring casing and the first inner ring casing respectively, and have a gap G1 between the first outer ring casing and the first inner ring casing respectively. The two vertical plates are connected to the horizontal plates at one end and connected to one end of the rectifier tube at the other end. The other end of the rectifier tube is connected to the mounting plate. The cross-section of the rectifier tube remains unchanged along the axial direction, and the mounting plate is bolted to the diffuser pipe.

6. The diffuser-embedded multi-head sector combustion chamber test piece according to claim 5, It is characterized in that The rectifier tube has a fan-shaped cross section and includes an outer ring rectifier plate, an inner ring rectifier plate and two side rectifier plates; The outer ring rectifying plate and the inner ring rectifying plate are both arc-shaped, and the arc radius of the outer ring rectifying plate is greater than the arc radius of the inner ring rectifying plate; The two side rectifying plates are respectively connected to two ends of the outer ring rectifying plate and the inner ring rectifying plate, and extend in a radial direction to be connected to the first outer ring casing and the first inner ring casing.

7. The diffuser-embedded multi-head sector combustion chamber test piece according to claim 4, It is characterized in that The pressure expansion pipeline comprises a fixed plate, a flow guide pipe, a flow expansion pipe and a cone wall; Two ends of the fixing plate are respectively connected with the second outer ring casing and the second inner ring casing by bolts; One end of the flow guide pipe is connected to the fixing plate, and the other end is connected to one end of the flow expansion pipe, and the cross section of the flow guide pipe remains unchanged along the axial direction; The other end of the flow diffuser is toward the flame tube assembly, and the cross section of the flow diffuser gradually increases from the end connected to the guide tube to the other end toward the flame tube assembly, so as to expand the airflow and guide the expanded airflow into the flame tube assembly; The conical wall is circumferentially arranged around the outer wall of the diffuser tube and is close to the second outer ring casing and the second inner ring casing, and has a gap G2 between the conical wall and the second outer ring casing and the second inner ring casing respectively.

8. The diffuser-embedded multi-head sector combustion chamber test piece according to claim 7, It is characterized in that The guide pipe has a fan-shaped cross section and includes an outer ring guide plate, an inner ring guide plate and two side guide plates; The outer ring guide plate and the inner ring guide plate are both arc-shaped, and the arc radius of the outer ring guide plate is greater than the arc radius of the inner ring guide plate; The two side guide plates are respectively connected to two ends of the outer ring guide plate and the inner ring guide plate, and extend in a radial direction to be connected to the second outer ring casing and the second inner ring casing.

9. The diffuser-embedded multi-head sector-shaped combustion chamber test piece according to claim 3, It is characterized in that The flame tube assembly also includes a flame tube outer wall, a flame tube inner wall and two flame tube side walls; The outer wall of the flame tube and the inner wall of the flame tube are both arc-shaped, and the arc radius of the outer wall of the flame tube is greater than the arc radius of the inner wall of the flame tube; The two flame tube side walls are respectively connected to the two ends of the flame tube outer wall and the flame tube inner wall, and extend in the radial direction to be connected to the second outer ring casing and the second inner ring casing; The flame tube heads are evenly arranged along the circumference of the flame tube assembly.

10. The diffuser-embedded multi-head sector combustion chamber test piece according to claim 3, It is characterized in that It also includes an ignition nozzle and a pulsating pressure sensing part, wherein the ignition nozzle and the pulsating pressure sensing part are both arranged on the second outer ring casing; The ignition nozzle is installed on the head of the flame tube in the middle position and is used to ignite the fuel and expand the air flow; The pulsating pressure sensing parts are respectively installed on the flame tube heads at non-middle positions and are used to measure the dynamic pressure of the gas during combustion.

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