Adjustable test reverse thrust cascade

Abstract

An adjustable test reverse thrust cascade is used for adjusting the axial length of the cascade. The adjustable test reverse thrust cascade comprises a leading edge component, a trailing edge component and a plurality of blade units; the leading edge component is provided with a rear connecting part at the rear side; the trailing edge component is provided with a front connecting part at the front side; each of the blade units comprises a blade and is provided with the front connecting part at the front side and the rear connecting part at the rear side; wherein the rear connecting part and the front connecting part are connected front to back to make the leading edge component, the plurality of blade units and the trailing edge component connected front to back to form the adjustable test reverse thrust cascade.

Description

Technical Field

[0001] This invention relates to the field of turbofan engine thrust reverser technology, and more particularly to an adjustable experimental thrust reverser cascade. Background Technology

[0002] In turbofan engine thrust reverser technology, the thrust reverser can change the direction of engine thrust. It deflects the exhaust gas forward at a certain angle, generating a thrust component in the opposite direction to the normal thrust, thus slowing the aircraft down. Thrust reversers can shorten the landing roll distance and can also be used as an emergency braking device in case of a failed takeoff. The thrust reverser blades are a key component of the thrust reverser system that changes the direction of engine exhaust flow.

[0003] Figure 1 This is a partial schematic diagram of a high bypass ratio turbofan engine in the prior art. Figure 2 This is a schematic diagram of the blade density parameters in the inverse calculation of the blade cascade in the prior art. Figure 3 This is a schematic diagram of the structure of the experimental thrust reverser cascade in the prior art.

[0004] like Figure 1 As shown, when the aircraft lands, the thrust reverser operates, and the airflow passes through the outer bypass duct 10, then sequentially through the thrust reverser inlet 20, the thrust reverser blade cascade duct 30, and the thrust reverser outlet 40 before being discharged from the engine. The front end of the thrust reverser is connected to the torque box 50, and the rear end is connected to the blade cascade support ring 60, all via fasteners.

[0005] like Figure 2 As shown, the axial length dimension a of the blade cascade remains unchanged. By adjusting the number of blades 80, the blade spacing value b is changed, thereby changing the blade density and thus the airflow outlet area.

[0006] Blade density and cascade axial length are key parameters in cascade design, which can be obtained through simulation calculations and finally verified through reverse-engineering aerodynamic performance tests. Figure 3 As shown, the existing experimental thrust reverser blade cascade consists of an experimental fixture 70 and an integral blade cascade 100. The experimental fixture 70 is connected to the front and rear ends of the integral blade cascade 100 via fasteners 90. The existing experimental thrust reverser blade cascade is a fixed, one-piece structure without adjustability. To test thrust reverser blade cascades with different blade densities or axial lengths, the fasteners 90 must be removed, and the integral blade cascade 100 must be replaced entirely. Therefore, a single aerodynamic test of a thrust reverser blade cascade can only verify the axial arrangement of a single blade cascade. To verify the aerodynamic performance of thrust reverser blade cascades with multiple axial arrangements, the integral blade cascade 100 must be redesigned and manufactured, and the test repeated. This increases testing costs, lengthens the testing cycle, and consequently extends the entire blade cascade design cycle, which is detrimental to project development. Summary of the Invention

[0007] The present application aims to provide an adjustable test reverse thrust cascade for adjusting the axial length of the cascade.

[0008] According to the embodiment of the present application, the adjustable test reverse thrust cascade comprises a leading edge component, a trailing edge component and a plurality of blade units; the leading edge component is provided with a rear connecting part at the rear side; the trailing edge component is provided with a front connecting part at the front side; each of the blade units comprises a blade and is provided with the front connecting part at the front side and the rear connecting part at the rear side; wherein the rear connecting part and the front connecting part are connected in front and back to make the leading edge component, the plurality of blade units and the trailing edge component connected in front and back to form the adjustable test reverse thrust cascade.

[0009] In one or more embodiments, the adjustable test reverse thrust cascade further comprises a bridging unit provided with the front connecting part at the front side and the rear connecting part at the rear side, and the rear connecting part and the front connecting part are connected in front and back to make the leading edge component, the plurality of blade units, the trailing edge component and the bridging unit connected in front and back to form the adjustable test reverse thrust cascade.

[0010] In one or more embodiments, the front connecting part comprises a front hook, the rear connecting part comprises a rear hook, the hook head of the front hook is clamped into the hook groove of the rear hook, and the hook head of the rear hook is clamped into the hook groove of the front hook to make the rear connecting part and the front connecting part connected in front and back.

[0011] In one or more embodiments, the hook groove of the rear hook opens downward, and the hook head of the rear hook protrudes downward; the hook groove of the front hook opens upward, and the hook head of the front hook protrudes upward.

[0012] In one or more embodiments, the leading edge component is provided with a rearward protruding longitudinal plate, and the rear connecting part of the leading edge component is arranged on the longitudinal plate of the leading edge component; the trailing edge component is provided with a forward protruding longitudinal plate, and the front connecting part of the trailing edge component is arranged on the longitudinal plate of the trailing edge component; each of the blade units is provided with a longitudinal plate, and the blade is located between the two longitudinal plates in the transverse direction, and the front connecting part and the rear connecting part of the blade unit are arranged on the longitudinal plate of the blade unit; the rear connecting part and the front connecting part are connected in front and back to make the longitudinal plate of the leading edge component, the longitudinal plate of the plurality of blade units and the longitudinal plate of the trailing edge component connected in front and back to form the longitudinal plate of the adjustable test reverse thrust cascade.

[0013] In one or more embodiments, the leading edge member is provided with a rearward protruding longitudinal plate, the longitudinal plate of the leading edge member is provided with a rear connecting portion of the leading edge member; the trailing edge member is provided with a forward protruding longitudinal plate, the longitudinal plate of the trailing edge member is provided with a front connecting portion of the trailing edge member; each of the blade units is provided with a longitudinal plate, the blade is located between two transverse longitudinal plates, the longitudinal plate of the blade unit is provided with a front connecting portion and a rear connecting portion of the blade unit; the bridging unit is provided with a longitudinal plate, the longitudinal plate of the bridging unit is provided with a front connecting portion and a rear connecting portion of the bridging unit; the rear connecting portion and the front connecting portion are connected front and rear to make the longitudinal plates of the leading edge member, the blade units, the trailing edge member and the bridging unit front and rear connected to form the longitudinal plate of the adjustable test thrust reverser cascade.

[0014] In one or more embodiments, the trailing edge member is provided with a plurality of longitudinal plates distributed along the transverse direction, and the longitudinal plates extend rearward to form a rib plate.

[0015] In one or more embodiments, the leading edge member is provided with a plurality of longitudinal plates distributed along the transverse direction.

[0016] In one or more embodiments, each of the blade units is provided with a plurality of longitudinal plates distributed along the transverse direction, and two transversely adjacent longitudinal plates are connected by the blade.

[0017] The embodiments of the present application have at least the following beneficial effects:

[0018] When the thrust reverser cascade of other cascade axial length needs to be tested, the cascade axial length can be adjusted by increasing or decreasing the number of blade units, the test operation is simple, and there is no need to design, manufacture and replace a plurality of integral cascades, thereby reducing the test cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and other characteristics, features and advantages of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of non-limiting example the presently proposed methods and apparatus.

[0020] Figure 1 It is a partial schematic view of a large-bypass-ratio turbofan engine in the prior art;

[0021] Figure 2 It is a schematic view of a blade density parameter of a thrust reverser cascade in the prior art;

[0022] Figure 3 It is a schematic view of a test thrust reverser cascade in the prior art;

[0023] Figure 4 It is an exploded view of an adjustable test thrust reverser cascade in the present application;

[0024] Figure 5 It is an oblique view of a trailing edge member in the present application;

[0025] Figure 6 This is a perspective view of the blade unit in this invention;

[0026] Figure 7 This is a perspective view of the leading edge component in this invention;

[0027] Figure 8 This is a perspective view of the bridging unit in this invention.

[0028] Figure label:

[0029] 10-Outer duct;

[0030] 20-Reverse thrust port;

[0031] 30-Reverse thrust cascade flow channel;

[0032] 40-Reverse push-out;

[0033] 50-torque box;

[0034] 60 - Blade support ring;

[0035] a - Axial length dimension of the blade cascade;

[0036] b - Blade spacing value;

[0037] 70 - Test fixtures;

[0038] 80-blade;

[0039] 90 - Fasteners;

[0040] 100 - Integral blade cascade;

[0041] 1-Leading edge component;

[0042] 2-Rear edge components;

[0043] 3-blade unit;

[0044] 4-leading edge stripe;

[0045] 5-Rear edge bar;

[0046] 6- Rear connecting part;

[0047] 7-Front connecting part;

[0048] 8-blade;

[0049] 9-Bridging unit;

[0050] 10-Longitudinal plate;

[0051] 11-rib plate;

[0052] 12-Front hook;

[0053] 13-Back hook;

[0054] 14-Hook head;

[0055] 15-Hook groove. Detailed Implementation

[0056] Reference will now be made in detail to embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the invention and not to limit it. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the invention without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the invention is intended to cover these modifications and variations that fall within the scope of the appended claims and their equivalents.

[0057] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0058] The terms “first”, “second”, etc., are used interchangeably to distinguish one feature from another and are not intended to indicate that each feature must be located in the position shown in the figure in each embodiment.

[0059] like Figure 4 As shown, the adjustable test thrust cascade includes a leading edge component 1, a trailing edge component 2, and multiple blade units 3.

[0060] like Figure 7 As shown, the leading edge member 1 includes a leading edge strip 4, which provides a front connecting edge for connecting to the torque box, thereby transferring the axial load of the blade stack to the torque box. The leading edge strip 4 can extend laterally. The lateral extension is perpendicular to the axial extension, and the same applies below.

[0061] like Figure 5 As shown, the trailing edge member 2 includes a trailing edge strip 5, which provides a rear connecting edge for connecting the blade support ring, thereby transferring the axial load of the blade to the blade support ring. The trailing edge strip 5 may extend laterally.

[0062] like Figure 7 As shown, the leading edge member 1 has a rear connecting portion 6 on its rear side. The rear connecting portion 6 is located on the rear side of the leading edge member 1 and may be located on the rear side of the leading edge strip 4.

[0063] like Figure 5 As shown, the rear edge member 2 has a front connecting portion 7 on its front side. The front connecting portion 7 is located on the front side of the rear edge member 2 and may be located on the front side of the rear edge strip 5.

[0064] likeFigure 6 As shown, each blade unit 3 includes a blade 8, and a front connecting portion 7 is provided on the front side, and a rear connecting portion 6 is provided on the rear side. The front connecting portion 7 is located on the front side of the blade unit 3, and may be located on the front side of the blade 8. The rear connecting portion 6 is located on the rear side of the blade unit 3, and may be located on the rear side of the blade 8. Each blade unit 3 may have a single row of transverse blades 8 arranged along the axial direction. Each blade unit 3 may also have multiple rows of transverse blades 8 arranged along the axial direction.

[0065] like Figure 4 As shown, the rear connecting part 6 and the front connecting part 7 are connected front to back, so that the leading edge member 1, multiple blade units 3, and trailing edge member 2 are connected front to back to form an adjustable test thrust reverser cascade. The rear connecting part 6 of the leading edge member 1 is connected front to back to the front connecting part 7 of the first-stage blade unit 3, the rear connecting part 6 of the first-stage blade unit 3 is connected front to back to the front connecting part 7 of the subsequent-stage blade unit 3, and the rear connecting part 6 of the last-stage blade unit 3 is connected front to back to the front connecting part 7 of the trailing edge member 2 to form an adjustable test thrust reverser cascade.

[0066] When it is necessary to test the axial length a of other blade cascades ( Figure 2 When using the reverse thrust blade cascade (as shown in the diagram), the axial length a of the blade cascade can be adjusted by increasing or decreasing the number of blade units 3. The test operation is simple and does not require the design, manufacture, or replacement of multiple integral blade cascades 100 (as shown in the diagram). Figure 3 (As shown in the image), this reduces testing costs.

[0067] like Figure 8 As shown, the adjustable test thrust reverser blade cascade may further include a bridging unit 9. The bridging unit 9 has a front connecting portion 7 on its front side and a rear connecting portion 6 on its rear side. The front connecting portion 7 is located on the front side of the bridging unit 9. The rear connecting portion 6 is located on the rear side of the bridging unit 9. The rear connecting portion 6 and the front connecting portion 7 are connected front to back, so that the leading edge member 1, multiple blade units 3, trailing edge member 2, and bridging unit 9 are connected front to back to form the adjustable test thrust reverser blade cascade. One or more bridging units 9 may be disposed between the leading edge member 1 and the first-stage blade unit 3, with the rear connecting portion 6 of the leading edge member 1 connected front to back to the front connecting portion 7 of the bridging unit 9, and the rear connecting portion 6 of the bridging unit 9 connected front to back to the front connecting portion 7 of the first-stage blade unit 3. One or more bridging units 9 may be disposed between the preceding blade unit 3 and the following blade unit 3, with the rear connecting portion 6 of the preceding blade unit 3 connected front to back to the front connecting portion 7 of the bridging unit 9, and the rear connecting portion 6 of the bridging unit 9 connected front to back to the front connecting portion 7 of the following blade unit 3. One or more bridging units 9 may be disposed between the last stage blade unit 3 and the trailing edge member 2, with the rear connecting portion 6 of the last stage blade unit 3 connected to the front connecting portion 7 of the bridging unit 9, and the rear connecting portion 6 of the bridging unit 9 connected to the front connecting portion 7 of the trailing edge member 2. Multiple bridging units 9 may be disposed consecutively, with the rear connecting portion 6 of the preceding bridging unit 9 connected to the front connecting portion 7 of the following bridging unit 9.

[0068] When the reverse-flow cascade of other axial length a (shown in FIG. 1) is to be tested, the axial length a of the cascade can be adjusted by increasing or decreasing the number of the bridging units 9 (the number of the bridging units 9 can be zero, i.e. no bridging unit 9 is provided), and the test operation is simple without the need to design, manufacture and replace a plurality of integral cascades 100 (shown in FIG. 1) to reduce the test cost. Figure 2 Figure 3 When the reverse-flow cascade of other blade solidity is to be tested, the blade pitch value b (shown in FIG. 1) can be adjusted by increasing or decreasing the number of the bridging units 9 (the number of the bridging units 9 can be zero, i.e. no bridging unit 9 is provided), and the blade solidity is further adjusted, and the test operation is simple without the need to design, manufacture and replace a plurality of integral cascades 100 (shown in FIG. 1) to reduce the test cost.

[0069] When the reverse-flow cascade of other blade solidity is to be tested, the blade pitch value b (shown in FIG. 1) can be adjusted by increasing or decreasing the number of the bridging units 9 (the number of the bridging units 9 can be zero, i.e. no bridging unit 9 is provided), and the blade solidity is further adjusted, and the test operation is simple without the need to design, manufacture and replace a plurality of integral cascades 100 (shown in FIG. 1) to reduce the test cost. Figure 2 Figure 3 When the reverse-flow cascade of other blade solidity is to be tested, the blade pitch value b (shown in FIG. 1) can be adjusted by increasing or decreasing the number of the bridging units 9 (the number of the bridging units 9 can be zero, i.e. no bridging unit 9 is provided), and the blade solidity is further adjusted, and the test operation is simple without the need to design, manufacture and replace a plurality of integral cascades 100 (shown in FIG. 1) to reduce the test cost.

[0070] As shown in FIG. 1, the leading edge member 1 can be provided with a longitudinal plate 10 protruding rearward. The longitudinal plate 10 of the leading edge member 1 can be located at the rear side of the leading edge strip 4 and protrude rearward from the leading edge strip 4. The longitudinal plate 10 can be perpendicular to the lateral direction and parallel to the axial direction, and the same applies hereinafter. The longitudinal plate 10 of the leading edge member 1 is provided with the rear connecting portion 6 of the leading edge member 1. Figure 7 As shown in FIG. 1, the trailing edge member 2 can be provided with a longitudinal plate 10 protruding forward. The longitudinal plate 10 of the trailing edge member 2 can be located at the front side of the trailing edge strip 5 and protrude forward from the trailing edge strip 5. The longitudinal plate 10 can be perpendicular to the lateral direction. The longitudinal plate 10 of the trailing edge member 2 is provided with the front connecting portion 7 of the trailing edge member 2.

[0071] Figure 5 As shown in FIG. 1, each blade unit 3 can be provided with a longitudinal plate 10. The blade 8 is located between two longitudinal plates 10 in the lateral direction, and the longitudinal plate 10 of the blade unit 3 can protrude forward and rearward from the blade 8. The longitudinal plate 10 can be perpendicular to the lateral direction. The longitudinal plate 10 of the blade unit 3 is provided with the front connecting portion 7 and the rear connecting portion 6 of the blade unit 3, and the front connecting portion 7 is provided at the part of the longitudinal plate 10 protruding forward relative to the blade 8, and the rear connecting portion 6 is provided at the part of the longitudinal plate 10 protruding rearward relative to the blade 8.

[0072] As shown in FIG. 1, the leading edge member 1 can be provided with a longitudinal plate 10 protruding rearward. The longitudinal plate 10 of the leading edge member 1 can be located at the rear side of the leading edge strip 4 and protrude rearward from the leading edge strip 4. The longitudinal plate 10 can be perpendicular to the lateral direction and parallel to the axial direction, and the same applies hereinafter. The longitudinal plate 10 of the leading edge member 1 is provided with the rear connecting portion 6 of the leading edge member 1. Figure 6 As shown in FIG. 1, the trailing edge member 2 can be provided with a longitudinal plate 10 protruding forward. The longitudinal plate 10 of the trailing edge member 2 can be located at the front side of the trailing edge strip 5 and protrude forward from the trailing edge strip 5. The longitudinal plate 10 can be perpendicular to the lateral direction. The longitudinal plate 10 of the trailing edge member 2 is provided with the front connecting portion 7 of the trailing edge member 2.

[0073] Figure 4 ​​​​As shown, the rear connecting portion 6 and the front connecting portion 7 are connected front to rear, and the longitudinal plate 10 of the leading edge member 1, the longitudinal plate 10 of the plurality of blade units 3, and the longitudinal plate 10 of the trailing edge member 2 are connected front to rear to form the longitudinal plate of the adjustable experimental anti-thrust cascade. The rear connecting portion 6 of the leading edge member 1 and the front connecting portion 7 of the first-stage blade unit 3 are connected front to rear, and the longitudinal plate 10 of the leading edge member 1 and the longitudinal plate 10 of the first-stage blade unit 3 are connected front to rear to form the longitudinal plate extending in the longitudinal direction. The rear connecting portion 6 of the first-stage blade unit 3 and the front connecting portion 7 of the rear-stage blade unit 3 are connected front to rear, and the longitudinal plate 10 of the first-stage blade unit 3 and the longitudinal plate 10 of the rear-stage blade unit 3 are connected front to rear to form the longitudinal plate extending in the longitudinal direction. The rear connecting portion 6 of the last-stage blade unit 3 and the front connecting portion 7 of the trailing edge member 2 are connected front to rear, and the longitudinal plate 10 of the last-stage blade unit 3 and the longitudinal plate 10 of the trailing edge member 2 are connected front to rear to form the longitudinal plate extending in the longitudinal direction. The front connecting portion 7 and / or the rear connecting portion 6 are arranged on the longitudinal plate 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2, and the rear connecting portion 6 and the front connecting portion 7 are connected front to rear so that the rear connecting portion 6 and the front connecting portion 7 become part of the longitudinal plate of the adjustable experimental anti-thrust cascade, and the rear connecting portion 6 and the front connecting portion 7 are avoided from becoming redundant structures affecting the aerodynamic performance of the adjustable experimental anti-thrust cascade.

[0074] As shown in FIG. 1, the front connecting portion 7 and the rear connecting portion 6 are arranged on the longitudinal plate 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2, and the rear connecting portion 6 and the front connecting portion 7 are connected front to rear so that the rear connecting portion 6 and the front connecting portion 7 become part of the longitudinal plate of the adjustable experimental anti-thrust cascade. Figures 4 to 7 As shown, the transverse width of the longitudinal plate 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2 can be the same, and the longitudinal plate of the adjustable experimental anti-thrust cascade formed by the front to rear connection has a uniform transverse width.

[0075] As shown, the transverse width of the longitudinal plate 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2 can be the same, and the longitudinal plate of the adjustable experimental anti-thrust cascade formed by the front to rear connection has a uniform transverse width. Figures 4 to 7 As shown, the transverse width of the longitudinal plate 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2 can be the same, and the longitudinal plate of the adjustable experimental anti-thrust cascade formed by the front to rear connection has a uniform transverse width.

[0076] As shown, the transverse width of the longitudinal plate 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2 can be the same, and the longitudinal plate of the adjustable experimental anti-thrust cascade formed by the front to rear connection has a uniform transverse width. Figure 8As shown, the bridge unit 9 can be provided with a longitudinal plate 10. The longitudinal plate 10 can be perpendicular to the transverse direction. The longitudinal plate 10 of the bridge unit 9 is provided with the front connecting portion 7 and the rear connecting portion 6 of the bridge unit 9, the front connecting portion 7 is provided at the front side of the longitudinal plate 10, and the rear connecting portion 6 is provided at the rear side of the longitudinal plate 10. The rear connecting portion 6 and the front connecting portion 7 are connected front to rear, and the longitudinal plate 10 of the front edge member 1, the longitudinal plate 10 of the plurality of blade units 3, the longitudinal plate 10 of the rear edge member 2, and the longitudinal plate 10 of the bridge unit 9 are connected front to rear to form the longitudinal plate of the adjustable experimental anti-thrust cascade.

[0077] As shown, the longitudinal plate 10 of the bridge unit 9 can have the same transverse width as the longitudinal plate 10 of the front edge member 1, the blade unit 3, and the rear edge member 2, and the longitudinal plate of the adjustable experimental anti-thrust cascade formed by the front to rear connection has a uniform transverse width. Figures 4 to 8 As shown, for the bridge unit 9, the transverse width of the rear connecting portion 6 and the front connecting portion 7 can be the same as the transverse width of the longitudinal plate 10, and the rear connecting portion 6 and the front connecting portion 7 can be considered as being formed by the extension of the longitudinal plate 10 in the plane, so that the rear connecting portion 6 and the front connecting portion 7 connected front to rear become part of the longitudinal plate of the adjustable experimental anti-thrust cascade.

[0078] Figure 8 As shown, for the bridge unit 9, the transverse width of the rear connecting portion 6 and the front connecting portion 7 can be the same as the transverse width of the longitudinal plate 10, and the rear connecting portion 6 and the front connecting portion 7 can be considered as being formed by the extension of the longitudinal plate 10 in the plane, so that the rear connecting portion 6 and the front connecting portion 7 connected front to rear become part of the longitudinal plate of the adjustable experimental anti-thrust cascade.

[0079] As shown, for the bridge unit 9, the transverse width of the rear connecting portion 6 and the front connecting portion 7 can be the same as the transverse width of the longitudinal plate 10, and the rear connecting portion 6 and the front connecting portion 7 can be considered as being formed by the extension of the longitudinal plate 10 in the plane, so that the rear connecting portion 6 and the front connecting portion 7 connected front to rear become part of the longitudinal plate of the adjustable experimental anti-thrust cascade. Figure 5 ​As shown, the trailing edge member 2 can include a plurality of longitudinal plates 10 distributed along the lateral direction. Two longitudinal plates 10 can be arranged at the two ends of the lateral direction as end plates, forming the end frame of the adjustable experimental thrust reverser cascade. The rest of the longitudinal plates 10 are arranged between the two longitudinal plates 10 along the lateral direction as partition plates, forming the partition frame of the adjustable experimental thrust reverser cascade. The longitudinal plates 10 can extend rearward to form a rib plate 11. The rib plate 11 can be distributed on the upper surface of the trailing edge strip 5. The rib plate 11 can be perpendicular to the lateral direction.

[0080] As shown, the leading edge member 1 can include a plurality of longitudinal plates 10 distributed along the lateral direction. Two longitudinal plates 10 can be arranged at the two ends of the lateral direction as end plates, forming the end frame of the adjustable experimental thrust reverser cascade. The rest of the longitudinal plates 10 are arranged between the two longitudinal plates 10 along the lateral direction as partition plates, forming the partition frame of the adjustable experimental thrust reverser cascade. Figure 7 As shown, each blade unit 3 can include a plurality of longitudinal plates 10 distributed along the lateral direction, and two longitudinally adjacent longitudinal plates 10 are connected by a blade 8. Two longitudinal plates 10 can be arranged at the two ends of the lateral direction as end plates, forming the end frame of the adjustable experimental thrust reverser cascade. The rest of the longitudinal plates 10 are arranged between the two longitudinal plates 10 along the lateral direction as partition plates, forming the partition frame of the adjustable experimental thrust reverser cascade.

[0081] Figure 6 As shown, the bridging unit 9 can include one longitudinal plate 10 along the lateral direction. When the bridging unit 9 is arranged, a plurality of bridging units 9 are arranged in a row along the lateral direction to bridge the plurality of longitudinal plates 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2 distributed along the lateral direction.

[0082] As shown, the front connecting portion 7 can include a front hook 12. The front hook 12 can be located on the front side of the longitudinal plate 10. The front hook 12 can protrude forward from the longitudinal plate 10 and can be perpendicular to the lateral direction. The lateral width of the front hook 12 can be the same as the lateral width of the longitudinal plate 10. The front hook 12 can be considered as an extension of the longitudinal plate 10 in the plane, thereby becoming part of the longitudinal plate of the adjustable experimental thrust reverser cascade formed by the front and rear connection. The rear connecting portion 6 can include a rear hook 13. The rear hook 13 can be located on the rear side of the longitudinal plate 10. The rear hook 13 can protrude rearward from the longitudinal plate 10 and can be perpendicular to the lateral direction. The lateral width of the rear hook 13 can be the same as the lateral width of the longitudinal plate 10. The rear hook 13 can be considered as an extension of the longitudinal plate 10 in the plane, thereby becoming part of the longitudinal plate of the adjustable experimental thrust reverser cascade formed by the front and rear connection. Figure 8 As shown, the bridging unit 9 can include one longitudinal plate 10 along the lateral direction. When the bridging unit 9 is arranged, a plurality of bridging units 9 are arranged in a row along the lateral direction to bridge the plurality of longitudinal plates 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2 distributed along the lateral direction.

[0083] Figures 4 to 8 As shown, the front connecting portion 7 can include a front hook 12. The front hook 12 can be located on the front side of the longitudinal plate 10. The front hook 12 can protrude forward from the longitudinal plate 10 and can be perpendicular to the lateral direction. The lateral width of the front hook 12 can be the same as the lateral width of the longitudinal plate 10. The front hook 12 can be considered as an extension of the longitudinal plate 10 in the plane, thereby becoming part of the longitudinal plate of the adjustable experimental thrust reverser cascade formed by the front and rear connection. The rear connecting portion 6 can include a rear hook 13. The rear hook 13 can be located on the rear side of the longitudinal plate 10. The rear hook 13 can protrude rearward from the longitudinal plate 10 and can be perpendicular to the lateral direction. The lateral width of the rear hook 13 can be the same as the lateral width of the longitudinal plate 10. The rear hook 13 can be considered as an extension of the longitudinal plate 10 in the plane, thereby becoming part of the longitudinal plate of the adjustable experimental thrust reverser cascade formed by the front and rear connection.

[0084] As shown, the bridging unit 9 can include one longitudinal plate 10 along the lateral direction. When the bridging unit 9 is arranged, a plurality of bridging units 9 are arranged in a row along the lateral direction to bridge the plurality of longitudinal plates 10 of the leading edge member 1, the blade unit 3, and the trailing edge member 2 distributed along the lateral direction. Figure 4 ​​As shown, the hook head 14 of the front hook 12 is clamped into the hook slot 15 of the rear hook 13, and the hook head 14 of the rear hook 13 is clamped into the hook slot 15 of the front hook 12, so that the rear connecting part 6 and the front connecting part 7 are connected front to back. The hook head 14 of the front hook 12 and the hook slot 15 of the rear hook 13 can have complementary shapes and sizes, and when clamped, the hook head 14 of the front hook 12 fills the hook slot 15 of the rear hook 13, avoiding the formation of holes or gaps that affect the aerodynamic performance of the longitudinal plate of the adjustable test counter-impulse cascade formed by the front to back connection. The hook head 14 of the rear hook 13 and the hook slot 15 of the front hook 12 can have complementary shapes and sizes, and when clamped, the hook head 14 of the rear hook 13 fills the hook slot 15 of the front hook 12, avoiding the formation of holes or gaps that affect the aerodynamic performance of the longitudinal plate of the adjustable test counter-impulse cascade formed by the front to back connection.

[0085] As shown, Figures 4 to 8 the upper and lower edges of the front hook 12 and the rear hook 13 can be flush with the upper and lower edges of the longitudinal plate 10, avoiding the formation of convexities or concave pits that affect the aerodynamic performance of the longitudinal plate of the adjustable test counter-impulse cascade formed by the front to back connection.

[0086] As shown, Figures 4 to 8 the front hook 12 and the rear hook 13 can have the same shape and size, only with different orientations, the hook head 14 of the front hook 12 corresponds to the orientation of the hook slot 15 of the rear hook 13, and the hook slot 15 of the front hook 12 corresponds to the orientation of the hook head 14 of the rear hook 13, thereby achieving clamping, for example, in the embodiment shown, the front hook 12 and the rear hook 13 are centrally symmetrical. This makes the design, manufacture, disassembly and arrangement simpler.

[0087] As shown, Figures 4 to 8 the hook slot 15 of the front hook 12 can be open upward and have a rectangular accommodation space, and the hook head 14 of the front hook 12 can protrude upward and have a rectangular profile. The lower edge of the front hook 12 can be flush with the lower edge of the longitudinal plate 10. The hook slot 15 of the rear hook 13 can be open downward and have a rectangular accommodation space, and the hook head 14 of the rear hook 13 can protrude downward and have a rectangular profile. The upper edge of the rear hook 13 can be flush with the upper edge of the longitudinal plate 10.

[0088] Various blade units 3 can be designed and manufactured, and the front connecting part 7 and the rear connecting part 6 of different blade units 3 protrude forward and backward to different lengths, and replacing different blade units 3 can adjust the cascade axial length a and the blade density, and the test operation is simple. In addition, replacing different blade units 3 to adjust the blade density while not changing the cascade axial length a does not require disassembly of the front edge member 1 and the rear edge member 2, and the test operation is simple. The front connecting part 7 and the rear connecting part 6 of different blade units 3 protrude forward and backward to different lengths, which can be achieved by lengthening or shortening the protruding length of the front hook 12 and the rear hook 13.

[0089] The application is disclosed above with examples, but it is not intended to limit the application, any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the application.

Claims

1. An adjustable experimental reverse thrust cascade, characterized in that Comprising: a leading edge member, a rear connecting portion being provided at a rear side; a trailing edge member, a front connecting portion being provided at a front side; a plurality of blade units, each of the blade units comprising a blade, the front connecting portion being provided at the front side, the rear connecting portion being provided at the rear side; and a bridging unit, the front connecting portion being provided at the front side, the rear connecting portion being provided at the rear side; wherein, the rear connecting portion and the front connecting portion are connected front to back to make the leading edge member, the plurality of blade units, the trailing edge member, and the bridging unit connected front to back to form the adjustable test reverse thrust cascade.

2. The adjustable test reverse thrust cascade according to claim 1, wherein: the front connecting portion comprises a front hook, the rear connecting portion comprises a rear hook, a hook head of the front hook is clamped into a hook groove of the rear hook, a hook head of the rear hook is clamped into a hook groove of the front hook to make the rear connecting portion and the front connecting portion connected front to back.

3. The adjustable test reverse thrust cascade according to claim 2, wherein: the hook groove of the rear hook opens downward, the hook head of the rear hook protrudes downward; the hook groove of the front hook opens upward, the hook head of the front hook protrudes upward.

4. The adjustable test reverse thrust cascade according to claim 1, wherein: the leading edge member is provided with a rearwardly protruding longitudinal plate, the longitudinal plate of the leading edge member provides the rear connecting portion of the leading edge member; the trailing edge member is provided with a forwardly protruding longitudinal plate, the longitudinal plate of the trailing edge member provides the front connecting portion of the trailing edge member; each of the blade units is provided with a longitudinal plate, the blade is located between two of the longitudinal plates in a transverse direction, the longitudinal plate of the blade unit provides the front connecting portion and the rear connecting portion of the blade unit; the bridging unit is provided with a longitudinal plate, the longitudinal plate of the bridging unit provides the front connecting portion and the rear connecting portion of the bridging unit; the rear connecting portion and the front connecting portion are connected front to back to make the longitudinal plate of the leading edge member, the longitudinal plate of the plurality of blade units, the longitudinal plate of the trailing edge member, and the longitudinal plate of the bridging unit connected front to back to form longitudinal plates of the adjustable test reverse thrust cascade.

5. The adjustable test reverse thrust cascade according to claim 4, wherein: the trailing edge member is distributed with a plurality of the longitudinal plates in a transverse direction, the longitudinal plates extend rearwardly to form a rib plate.

6. The adjustable test reverse thrust cascade according to claim 4, wherein: the leading edge member is distributed with a plurality of the longitudinal plates in a transverse direction.

7. The adjustable test reverse thrust cascade according to claim 4, wherein: each of the blade units is distributed with a plurality of the longitudinal plates in a transverse direction, two of the longitudinal plates transversely adjacent are connected by the blade in a transverse direction.

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