A combustion chamber curved wall cooling test device

Abstract

The present invention discloses a combustion chamber curved wall cooling test device. The test device includes a mainstream pipeline assembly, a secondary flow pipeline, and a test piece. The test piece includes a test plate and an air flow plate, and both the test plate and the air flow plate are provided with curved sections. The test plate is arranged outside the air flow plate, and a gap is provided between the test plate and the air flow plate to form a cold flow return channel. The present invention can realize the experimental study on the cooling characteristics of curved walls with variable curvature. The tapered channel design ensures that the mainstream gas does not separate when flowing through the wall to be measured and always adheres to the wall to be measured, simulating the real working environment of the combustion chamber. The cooling structure with no mixing of the mainstream and the secondary flow can simultaneously meet the tests of the flow coefficient and the wall temperature, reducing the number of tests and costs. The detachable design facilitates the disassembly and replacement of the test piece.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and particularly to a combustion chamber curved wall cooling test device. Background Art

[0002] With the continuous improvement of the power-to-weight ratio of turboshaft and turboprop engines, the inlet temperature and temperature rise level of the combustion chamber are also increasing continuously. The design of combustion chamber components will develop towards high-temperature-rise and high-heat-capacity combustion, with an increasing service life, and the requirements for reducing the wall temperature level and wall temperature gradient are constantly increasing. This brings a series of technical problems in the design of engine combustion chambers, such as fuel-air matching, combustion organization, outlet temperature field quality control, and flame tube wall cooling. At present, the outlet temperature of the combustion chambers of turboshaft and turboprop engines has exceeded 1750K, and the temperature rise has also exceeded 1000K. Under the conditions of less and less cooling air volume and gradually decreasing cooling potential, further maintaining or even improving the durability of the flame tube will be a key technical challenge for high-temperature-rise combustion chambers. Therefore, it is necessary to conduct experimental research on the wall cooling characteristics of the combustion chamber flame tube with a real profile. Nowadays, most of the experimental methods for wall cooling research are limited to flat structures, and the main research object is flat test pieces, which cannot simulate the real working environment in the combustion chamber and cannot study the wall cooling characteristics of curved walls with variable curvature radii. Summary of the Invention

[0003] The purpose of the present invention is to provide a combustion chamber curved wall cooling test device to solve the above technical problems.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A combustion chamber curved wall cooling test device, the test device includes a mainstream pipeline assembly, a secondary flow pipeline, and a test piece;

[0006] The test piece includes a test plate and an air flow plate, and both the test plate and the air flow plate are provided with curved sections; the test plate is arranged outside the air flow plate, and a gap is provided between the test plate and the air flow plate to form a cold flow return channel. The test plate and the air flow plate are both detachably installed at one end of the secondary flow pipeline and are located inside the mainstream pipeline assembly; the secondary flow pipeline is detachably arranged on the mainstream pipeline assembly, and the test plate blocks the connection between the mainstream pipeline assembly and the secondary flow pipeline;

[0007] A number of air flow holes are provided on the air flow plate, and a first exhaust hole is communicated and arranged on the lower side of the mainstream pipeline assembly; a second exhaust hole is arranged on the lower side of the test plate, and the secondary flow pipeline, the air flow holes, the cold flow return channel, the first exhaust hole, and the second exhaust hole are communicated in sequence.

[0008] Preferably, the main flow pipeline assembly includes a first main flow pipeline, a transition pipeline, a second main flow pipeline, and a fixed pipeline. The transition pipeline is arranged at the connection of the first main flow pipeline and the second main flow pipeline. Both the first main flow pipeline and the second main flow pipeline are communicated with the transition pipeline. The fixed pipeline is communicatively arranged on the transition pipeline, and a first exhaust hole is communicatively arranged on the fixed pipeline.

[0009] The transition pipeline is an arc-shaped pipe, and the arching direction of the transition pipeline is on the side away from the fixed pipeline; the arching directions of the bending sections of the test plate and the air flow plate are on the same side as the arching direction of the transition pipeline.

[0010] Preferably, a tapered channel is formed between the test plate and the transition pipeline, and the tapering direction of the tapered channel is consistent with the flowing direction of the hot air flow.

[0011] Preferably, the test plate includes a first flat plate, a first bending plate, and a second flat plate connected in sequence. The first flat plate is closely attached to the inner wall on the upper side of the fixed pipeline, and the second flat plate is closely attached to the inner wall on the lower side of the fixed pipeline.

[0012] The air flow plate includes a third flat plate, a second bending plate, and a fourth flat plate connected in sequence. The third flat plate is closely attached to the inner side of the first flat plate, the second bending plate is arranged on the inner side of the first bending plate, the fourth flat plate is arranged on the inner side of the second flat plate, and the first bending plate and the second bending plate bend into the transition pipeline.

[0013] A gap is provided between the second bending plate and the first bending plate and between the second flat plate and the fourth flat plate to form the cold flow return channel, and the second exhaust hole is arranged on the second flat plate.

[0014] Preferably, the ratio of the vertical distance from the upper node of the transition pipeline to the first flat plate to the vertical distance from the lower node of the transition pipeline to the second flat plate is 3:1.

[0015] Preferably, the secondary flow pipeline is detachably connected to the fixed pipeline. First fixing plates are arranged at the ends of the first flat plate and the second flat plate; second fixing plates are arranged at the ends of the third flat plate and the fourth flat plate, and the first fixing plates and the second fixing plates are fixed between the secondary flow pipeline and the fixed pipeline.

[0016] Preferably, the fixed pipeline is horizontally arranged, the first main flow pipeline and the second main flow pipeline are respectively arranged on both sides of the fixed pipeline, the included angle between the first main flow pipeline and the fixed pipeline is an acute angle, and the included angle between the second main flow pipeline and the fixed pipeline is an acute angle.

[0017] Preferably, the first flat plate, the second flat plate, the third flat plate and the fourth flat plate are thickened plates, and the thicknesses of the first flat plate, the second flat plate, the third flat plate and the fourth flat plate are greater than the thickness of the first bending plate.

[0018] Preferably, the test device further includes a plurality of connecting pipes. The air inlet of the first main pipeline is connected with the connecting pipe, the air outlet of the second main pipeline is connected with the connecting pipe, and the air inlet of the secondary flow pipeline is connected with the connecting pipe;

[0019] The connecting pipe is an inclined pipe, and the cross-sectional area of the connecting pipe gradually decreases from the outer connecting end to the inner connecting end; the air inlet of the first main pipeline, the air outlet of the second main pipeline and the air inlet of the secondary flow pipeline are all connected to the inner connecting end of the connecting pipe.

[0020] Preferably, a plurality of observation channels are communicated on the transition pipeline, and an infrared observation window is arranged on each observation channel. A thermocouple lead-out port is arranged on the second main pipeline, and a thermocouple lead seat is arranged at the thermocouple lead-out port, and the thermocouple lead seat is used for connecting a temperature measuring component;

[0021] A continuous cross-section of the first bending plate along the bending direction is within the observation angle coverage area formed by a plurality of the infrared observation windows.

[0022] Preferably, the test device further includes a main pipeline system, a secondary pipeline system, a temperature measuring component and an infrared thermal imager; the main pipeline system is connected to the outer connecting end of the connecting pipe on the first main pipeline and is used to provide hot air flow, and the secondary pipeline system is connected to the outer connecting end of the connecting pipe on the secondary flow pipeline and is used to provide cold air flow;

[0023] The temperature measuring component is a thermocouple sensor, and the thermocouple sensor is installed on the thermocouple lead seat;

[0024] An infrared thermal imager corresponding to each infrared observation window is arranged on the outside, and the infrared thermal imager is connected to a monitoring terminal.

[0025] Preferably, the main pipeline system includes a first air compressor, an air storage tank, a first flowmeter and an electric heater. The air inlet end of the air storage tank is connected to the first air compressor. Control valves are arranged on both the air inlet side and the air outlet side of the air storage tank. The air outlet end of the air storage tank is connected to the electric heater. A first flowmeter is arranged between the electric heater and the air storage tank. The air outlet end of the electric heater is communicated with the outer connecting end of the connecting pipe arranged on the first main pipeline.

[0026] Preferably, the secondary pipeline system includes a second air compressor and a second flowmeter. The second air compressor is connected to the outer connection end of the connecting pipeline on the secondary flow pipeline through a pipeline. The second flowmeter is arranged on the pipeline, and a control valve is also arranged on the pipeline between the second air compressor and the second flowmeter.

[0027] Preferably, seals are provided between the fixed pipeline and the first fixing plate, between the first fixing plate and the second fixing plate, and between the second fixing plate and the secondary flow pipeline.

[0028] Advantages of the present invention:

[0029] 1. The present invention can realize the experimental study on the cooling characteristics of a curved wall surface with variable curvature. The tapered channel design ensures that the mainstream gas does not separate when flowing through the wall surface to be measured and always adheres to the wall surface to be measured, simulating the real working environment of the combustion chamber.

[0030] 2. The cooling structure of the present invention with non-mixing of the mainstream and the secondary flow can simultaneously meet the tests of the flow coefficient and the wall temperature, reducing the number of tests and costs. The detachable design facilitates the disassembly and replacement of the test piece.

[0031] 3. The present invention is provided with a temperature measurement component and an infrared thermal imager. When observing the wall temperature field, the observation data of the infrared thermal imager can be calibrated in real time with the acquisition data of the temperature measurement component, making the test more accurate.

[0032] 4. To ensure no air leakage during the test process, an asbestos gasket is provided for sealing at the flange mating part and sealed by tightening bolts. When conducting the test on the double-layer wall curved wall surface cooling structure, the cavity spacing of the double-layer wall cooling structure can be adjusted by replacing the combination of the test plate and the air flow plate of the curved wall surface or by increasing and decreasing the number of asbestos gaskets, realizing the simulation of different states.

[0033] Other features and advantages of the present invention will be described in the subsequent description, and some of them will be obvious from the description or understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the description, claims, and drawings. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1It is a schematic structural diagram of the experimental device of the present invention;

[0036] Figure 2 It is a schematic structural diagram of the test component of the present invention;

[0037] Figure 3 It is the present invention Figure 2 Schematic enlarged structure diagram at position A in;

[0038] Figure 4 It is the working principle diagram of the infrared thermal imager of the present invention.

[0039] In the figure: 1, main flow pipeline component; 2, secondary flow pipeline; 3, test piece; 4, main pipeline system; 5, secondary pipeline system; 6, temperature measurement component; 7, infrared thermal imager; 8, connecting pipeline; 9, infrared observation window; 10, monitoring terminal; 11, first main pipeline; 12, transition pipeline; 13, second main pipeline; 14, fixed pipeline; 15, thermocouple lead seat; 121, upper node; 122, lower node; 141, first exhaust hole; 31, test plate; 32, air flow plate; 311, first flat plate; 312, first bending plate; 313, second flat plate; 314, first fixing plate; 315, second exhaust hole; 321, third flat plate; 322, second bending plate; 323, fourth flat plate; 324, second fixing plate; 41, first air compressor; 42, air storage tank; 43, first flowmeter; 44, electric heater; 51, second air compressor; 52, second flowmeter. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0042] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] As Figure 1 shown, a combustion chamber curved wall cooling test device is disclosed in an embodiment of the present invention. The test device includes a test assembly, a main pipeline system 4, a secondary pipeline system 5, a temperature measurement assembly 6, and an infrared thermal imager 7. Both the main pipeline system 4 and the secondary pipeline system 5 are connected to the test assembly. The main pipeline system 4 is used to provide a hot air flow to the test assembly to simulate the gas flow ejected from the flame tube, and the secondary pipeline system 5 is used to provide a cold air flow to the test assembly to simulate the cooling air flow of the flame tube wall. The temperature measurement assembly 6 is installed on the test assembly and on the pipe wall through which the hot air flow passes, and is used to monitor the change of the hot air flow temperature in real time. The infrared thermal imager 7 is also used for real-time temperature monitoring.

[0044] As Figure 2 shown, the test assembly includes a main flow pipeline assembly 1, a secondary flow pipeline 2, a test piece 3, and several connecting pipelines 8. Connecting pipelines 8 are connected to both the air inlet and the air outlet of the main flow pipeline assembly 1. A connecting pipeline 8 is provided at the air inlet of the secondary flow pipeline 2. The secondary flow pipeline 2 is detachably arranged on the main flow pipeline assembly 1, and the test piece 3 is clamped between the main flow pipeline assembly 1 and the secondary flow pipeline 2.

[0045] As Figure 2 、 Figure 3 shown, the main flow pipeline assembly 1 includes a first main flow pipeline 11, a transition pipeline 12, a second main flow pipeline 13, and a fixed pipeline 14. The first main flow pipeline 11 and the second main flow pipeline 13 are connected through the transition pipeline 12 to achieve the communication between the first main flow pipeline 11 and the second main flow pipeline 13. A connecting pipeline 8 is connected and installed at the air inlet of the first main flow pipeline 11, and a connecting pipeline 8 is connected and installed at the air outlet of the second main flow pipeline 13.

[0046] The fixed pipeline 14 is connected and arranged on the transition pipeline 12, and the fixed pipeline 14 is horizontally arranged. The end of the fixed pipeline 14 is provided with a flange with an installation hole. A first exhaust hole 141 is connected and arranged on the lower side of the fixed pipeline 14. The first main pipeline 11 and the second main pipeline 13 are respectively arranged on both sides of the fixed pipeline 14. The included angle between the first main pipeline 11 and the fixed pipeline 14 is an acute angle, and the included angle between the second main pipeline 13 and the fixed pipeline 14 is an acute angle, which is convenient for the installation of the external connection and reduces the installation difficulty. The transition pipeline 12 is an arc-shaped pipe, and the arching direction is the side away from the fixed pipeline 14.

[0047] Due to the large curvature of the bending wall surface of the test piece 3, in order to meet the observation of the temperature field of the entire wall surface, 2 observation channels are connected and arranged on the transition pipeline 12, and an infrared observation window 9 is arranged on each observation channel to ensure that the temperature fields of the upstream and downstream wall surfaces of the test piece 3 are observed simultaneously. In order to ensure the authenticity and reliability of the data of the infrared thermal imaging technology, a thermocouple lead-out port is arranged on the second main pipeline 13, and a thermocouple lead seat 15 is arranged at the thermocouple lead-out port. The temperature measurement component 6 (thermocouple sensor) is installed on the thermocouple lead seat 15. The temperature measurement component 6 is used to detect the temperature of its corresponding installation point. The infrared thermal imager 7 can observe the temperature of the measured wall surface. Therefore, when observing the temperature field of the wall surface, the observation data of the infrared thermal imager 7 and the acquisition data of the temperature measurement component 6 can be calibrated and fitted in real time, and the accurate temperature of the entire wall surface temperature field can be obtained.

[0048] One end (air inlet) of the first main pipeline 11 is provided with a flange with an installation hole, one end (air outlet) of the second main pipeline 13 is provided with a flange with an installation hole, both ends of the connecting pipeline 8 are provided with flanges with installation holes. The connecting pipeline 8 is an inclined pipe, the large-diameter end of the inner diameter is the outer connecting end, and the small-diameter end of the inner diameter is the inner connecting end. The cross-sectional area of the connecting pipeline 8 gradually decreases from the outer connecting end to the inner connecting end. The flange at the inner connecting end of the connecting pipeline 8 fits with the flange on the first main pipeline 11, and the two are fixed by bolts passing through the installation holes to realize the connection between the connecting pipeline 8 and the first main pipeline 11; while on the second main pipeline 13, the flange at the inner connecting end of the connecting pipeline 8 fits with the flange on the second main pipeline 13, and the two are fixed by bolts passing through the installation holes to realize the connection between the second main pipeline 13 and the connecting pipeline 8; the main air flow enters from the outer connecting end of the connecting pipeline 8, successively passes through the first main pipeline 11, the transition pipeline 12 and the second main pipeline 13, and then flows out from the outer connecting end of the connecting pipeline 8 connected to the second main pipeline 13.

[0049] Both ends of the secondary flow pipeline 2 are provided with flanges with installation holes. The flange at one end of the secondary flow pipeline 2 fits with the flange at the inner connecting end of the connecting pipeline 8, and the two are fixed by bolts passing through the installation holes. The flange at the other end of the secondary flow pipeline 2 sandwiches the test piece 3 with the flange on the fixed pipeline 14 and is fixed by bolts.

[0050] It should be noted that in order to increase the sealing performance of the device, a sealing element (such as an asbestos gasket) can be added at the connection of the flange to increase the sealing performance of the flange connection, reduce the risk of air leakage, and improve the accuracy of the test.

[0051] The test piece 3 includes a test plate 31 and an air flow plate 32. The test plate 31 is a test plate that simulates the inner wall of the engine flame tube. The test plate 31 isolates the cold air flow and the hot air flow. The test plate 31 is arranged outside the air flow plate 32. The test plate 31 includes a first flat plate 311, a first bent plate 312, and a second flat plate 313 that are sequentially connected. The first flat plate 311 and the second flat plate 313 are respectively attached to the inner walls on the upper and lower sides of the fixed pipe 14. The bending direction of the first bent plate 312 faces the side of the hot air flow, that is, the side away from the secondary flow pipe 2. First fixing plates 314 are arranged at the ends of the first flat plate 311 and the second flat plate 313.

[0052] The air flow plate 32 includes a third flat plate 321, a second bent plate 322, and a fourth flat plate 323 that are sequentially connected. The third flat plate 321 is attached to the inner side of the first flat plate 311. The second bent plate 322 is arranged on the inner side of the first bent plate 312. The fourth flat plate 323 is arranged on the inner side of the second flat plate 313. The inner walls of the third flat plate 321 and the fourth flat plate 323 are flush with the inner walls on the upper and lower sides of the secondary flow pipe 2 respectively. Second fixing plates 324 are arranged at the ends of the third flat plate 321 and the fourth flat plate 323. In order to avoid deformation caused by the impact pressure of the hot air flow and the cold air flow, the first flat plate 311, the second flat plate 313, the third flat plate 321, and the fourth flat plate 323 are thickened to increase their strength and improve their bending resistance. The first bent plate 312 and the second bent plate 322 are both bent and arched towards the side of the hot air flow. The first bent plate 312 and the second bent plate 322 bend into the transition pipe 12. Bolts sequentially pass through the flange on the secondary flow pipe 2, the second fixing plate 324, the first fixing plate 314, and the flange on the fixed pipe 14 to fix the test plate 31 and the air flow plate 32 between the fixed pipe 14 and the secondary flow pipe 2. In order to increase the airtightness, asbestos gaskets can be added between the flange on the secondary flow pipe 2 and the second fixing plate 324 and between the first fixing plate 314 and the flange on the fixed pipe 14 respectively to ensure its sealing performance. At the same time, the cavity spacing size of the double-layer wall cooling structure can be adjusted by replacing the test plate 31 and the air flow plate 32 with curved walls or by increasing and decreasing the number of asbestos gaskets.

[0053] A number of air holes are provided on the second bending plate 322. There are gaps between the second bending plate 322 and the first bending plate 312, and between the second flat plate 313 and the fourth flat plate 323, forming a cold flow return channel. A second exhaust hole 315 is provided on the second flat plate 313. The second exhaust hole 315 is communicated with the cold flow return channel. The first exhaust hole 141 is communicated with the second exhaust hole 315. The cold air flows in from the connecting pipe 8 connected to the secondary flow pipe 2, passes through the secondary flow pipe 2 and the inner side of the air flow plate 32, then passes through the air holes into the cold flow return channel and the second exhaust hole 315, and finally is discharged from the first exhaust hole 141.

[0054] A tapered channel is formed between the inner wall of the transition pipe 12 and the first bending plate 312. In order to truly simulate the real flow channel of the return combustion chamber, the main flow channel adopts a tapered structure along the direction of the hot air flow. The ratio of the vertical distance from the upper node 121 of the transition pipe 12 to the first flat plate 311 to the vertical distance from the lower node 122 of the transition pipe 12 to the second flat plate 313 is 3:1, ensuring that the main flow gas does not separate when flowing through the measured wall surface and always adheres to the measured wall surface (the first bending plate 312).

[0055] Since the first bending plate 312 has different curvature surfaces, for easy observation, a continuous cross-section of the first bending plate 312 along the bending direction is within the observation angle coverage area formed by a number of infrared observation windows 9. A corresponding infrared thermal imager 7 is provided outside each infrared observation window 9. The infrared thermal imager 7 is connected to the monitoring terminal 10 for real-time monitoring of temperature changes. The principle is as Figure 4 shown. The infrared thermal imager 7 detects the light passing through the hot side channel and irradiates it on the measured wall surface.

[0056] As Figure 1 shown, the main pipeline system 4 includes a first air compressor 41, an air storage tank 42, a first flowmeter 43 and an electric heater 44. The air inlet end of the air storage tank 42 is connected to the first air compressor 41. Control valves are provided on both the air inlet side and the air outlet side of the air storage tank 42 for controlling the entry and exit of the gas in the air storage tank 42. The air outlet end of the air storage tank 42 is connected to the electric heater 44. A first flowmeter 43 is provided between the electric heater 44 and the air storage tank 42 for monitoring parameters such as gas flow rate for easy regulation. The air outlet end of the electric heater 44 is communicated with the outer connection end of the connecting pipe 8 provided on the first main pipeline 11, and the hot air flow is passed through the main pipeline assembly 1 for simulation testing.

[0057] As Figure 1As shown in the figure, the secondary pipeline system 5 includes a second air compressor 51 and a second flowmeter 52. The second air compressor 51 is connected to the outer connection end of the connection pipeline 8 on the secondary flow pipeline 2 through a pipeline. The second flowmeter 52 is arranged on the pipeline for monitoring the air flow. A control valve is also arranged on the pipeline of the connection pipeline 8 between the second air compressor 51 and the secondary flow pipeline 2. The air flow is output from the second air compressor 51 and transported into the secondary flow pipeline 2 through the pipeline for simulation testing.

[0058] A number of total temperature and total pressure probes and a number of static pressure nozzles are arranged on both the first main pipeline 11 and the second main pipeline 13. The secondary flow pipeline 2 is also provided with total temperature and total pressure probes and a number of static pressure nozzles for measuring the total temperature, total pressure and static pressure in the channel.

[0059] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature has a lower horizontal height than the second feature.

[0060] In the description of this specification, the description with reference to terms such as "an embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0061] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A combustion chamber curved wall cooling test device, characterized in that The test device includes a main flow pipeline assembly (1), a secondary flow pipeline (2), and a test piece (3). The test piece (3) includes a test plate (31) and an air flow plate (32). Both the test plate (31) and the air flow plate (32) are provided with bending sections. The test plate (31) is arranged outside the air flow plate (32). A gap is provided between the test plate (31) and the air flow plate (32) to form a cold flow return channel. Both the test plate (31) and the air flow plate (32) are detachably installed at one end of the secondary flow pipeline (2) and are located within the main flow pipeline assembly (1). The secondary flow pipeline (2) is detachably arranged on the main flow pipeline assembly (1). The test plate (31) blocks the connection between the main flow pipeline assembly (1) and the secondary flow pipeline (2). A number of air flow holes are provided on the air flow plate (32). A first exhaust hole (141) is communicatively provided on the lower side of the main flow pipeline assembly (1). A second exhaust hole (315) is provided on the lower side of the test plate (31). The secondary flow pipeline (2), the air flow holes, the cold flow return channel, the first exhaust hole (141), and the second exhaust hole (315) are communicatively connected in sequence. The main flow pipeline assembly (1) includes a first main flow pipeline (11), a transition pipeline (12), a second main flow pipeline (13), and a fixed pipeline (14). The transition pipeline (12) is arranged at the connection of the first main flow pipeline (11) and the second main flow pipeline (13). Both the first main flow pipeline (11) and the second main flow pipeline (13) are communicatively connected to the transition pipeline (12). The fixed pipeline (14) is communicatively provided on the transition pipeline (12). The transition pipeline (12) is an arc-shaped pipe. The arching direction of the transition pipeline (12) is towards the side away from the fixed pipeline (14). The arching directions of the bending sections of the test plate (31) and the air flow plate (32) are the same as that of the transition pipeline (12). A tapered channel is formed between the test plate (31) and the transition pipeline (12). The tapering direction of the tapered channel is consistent with the flowing direction of the hot air flow.

2. The combustion chamber curved wall cooling test device according to claim 1, characterized in that A first exhaust hole (141) is communicatively provided on the upper side of the fixed pipeline (14).

3. A combustion chamber curved wall cooling test device according to claim 1, characterized in that, The test plate (31) includes a first flat plate (311), a first bending plate (312), and a second flat plate (313) connected in sequence. The first flat plate (311) is closely attached to the inner wall on the upper side of the fixed pipeline (14). The second flat plate (313) is closely attached to the inner wall on the lower side of the fixed pipeline (14). The air flow plate (32) includes a third flat plate (321), a second bent plate (322), and a fourth flat plate (323) connected in sequence. The third flat plate (321) is closely attached to the inner side of the first flat plate (311). The second bent plate (322) is arranged on the inner side of the first bent plate (312). The fourth flat plate (323) is arranged on the inner side of the second flat plate (313). The first bent plate (312) and the second bent plate (322) bend and extend into the transition duct (12). There are gaps between the second bent plate (322) and the first bent plate (312), and between the second flat plate (313) and the fourth flat plate (323), forming the cold flow return channel. The second exhaust hole (315) is arranged on the second flat plate (313).

4. A combustion chamber curved wall cooling test device according to claim 3, characterized in that The ratio of the vertical distance from the upper node (121) of the transition duct (12) to the first flat plate (311) to the vertical distance from the lower node (122) of the transition duct (12) to the second flat plate (313) is 3:

1.

5. The combustion chamber curved wall cooling test device according to claim 3, characterized in that The secondary flow duct (2) is detachably connected to the fixed duct (14). First fixing plates (314) are arranged at the ends of the first flat plate (311) and the second flat plate (313). Second fixing plates (324) are arranged at the ends of the third flat plate (321) and the fourth flat plate (323). The first fixing plates (314) and the second fixing plates (324) are fixed between the secondary flow duct (2) and the fixed duct (14).

6. A combustion chamber curved wall cooling test device according to any one of claims 1-5, characterized in that, The fixed duct (14) is horizontally arranged. The first main duct (11) and the second main duct (13) are respectively arranged on both sides of the fixed duct (14). The angle between the first main duct (11) and the fixed duct (14) is an acute angle. The angle between the second main duct (13) and the fixed duct (14) is an acute angle.

7. A combustion chamber curved wall cooling test device according to any one of claims 3-5, characterized in that, The first flat plate (311), the second flat plate (313), the third flat plate (321), and the fourth flat plate (323) are thickened plates. The thicknesses of the first flat plate (311), the second flat plate (313), the third flat plate (321), and the fourth flat plate (323) are greater than the thickness of the first bent plate (312).

8. A combustion chamber curved wall cooling test device according to any one of claims 3-5, characterized in that, The test device further includes a plurality of connecting ducts (8). The air inlet of the first main duct (11) is connected and installed with the connecting duct (8). The air outlet of the second main duct (13) is connected and installed with the connecting duct (8). The air inlet of the secondary flow duct (2) is connected with the connecting duct (8). The connecting duct (8) is an inclined duct. The cross-sectional area of the connecting duct (8) gradually decreases from the outer connecting end to the inner connecting end. The air inlet of the first main duct (11), the air outlet of the second main duct (13), and the air inlet of the secondary flow duct (2) are all connected to the inner connecting end of the connecting duct (8).

9. The combustion chamber curved wall cooling test device according to claim 8, wherein, A plurality of observation channels are communicatively provided on the transition pipeline (12), and an infrared observation window (9) is provided on each of the observation channels. A thermocouple lead outlet is provided on the second main pipeline (13), and a thermocouple lead seat (15) is provided at the thermocouple lead outlet. The thermocouple lead seat (15) is used to connect the temperature measurement component (6); A continuous cross-section of the first bending plate (312) in the bending direction is within the observation angle coverage area formed by a plurality of the infrared observation windows (9).

10. A combustion chamber curved wall cooling test device according to claim 9, characterized in that, The test device further includes a main pipeline system (4), a secondary pipeline system (5), a temperature measurement component (6), and an infrared thermal imager (7); the main pipeline system (4) is connected to the outer connection end of the connection pipeline (8) on the first main pipeline (11) and is used to provide a hot air flow. The secondary pipeline system (5) is connected to the outer connection end of the connection pipeline (8) on the secondary flow pipeline (2) and is used to provide a cold air flow; The temperature measurement component (6) is a thermocouple sensor, and the thermocouple sensor is installed on the thermocouple lead seat (15); An infrared thermal imager (7) corresponding to each of the infrared observation windows (9) is provided on the outside of each infrared observation window (9), and the infrared thermal imager (7) is connected to the monitoring terminal (10).

11. A combustion chamber curved wall cooling test device according to claim 10, characterized in that, The main pipeline system (4) includes a first air compressor (41), a gas storage tank (42), a first flowmeter (43), and an electric heater (44). The intake end of the gas storage tank (42) is connected to the first air compressor (41). Control valves are provided on both the intake side and the outlet side of the gas storage tank (42). The outlet end of the gas storage tank (42) is connected to the electric heater (44). A first flowmeter (43) is provided between the electric heater (44) and the gas storage tank (42). The outlet end of the electric heater (44) communicates with the outer connection end of the connection pipeline (8) provided on the first main pipeline (11).

12. A combustion chamber curved wall cooling test device according to claim 10, characterized in that, The secondary pipeline system (5) includes a second air compressor (51) and a second flowmeter (52). The second air compressor (51) is connected to the outer connection end of the connection pipeline (8) on the secondary flow pipeline (2) through a pipeline. The second flowmeter (52) is provided on the pipeline. A control valve is also provided on the pipeline between the second air compressor (51) and the second flowmeter (52).

13. The combustion chamber curved wall cooling test device according to claim 5, wherein Sealing members are provided between the fixed pipeline (14) and the first fixing plate (314), between the first fixing plate (314) and the second fixing plate (324), and between the second fixing plate (324) and the secondary flow pipeline (2).

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