Plane cascade test device

Abstract

The invention provides a plane cascade test device, and relates to the technical field of aero-engine tests. The plane cascade test device comprises a test tube and a plurality of test blades, the test tube is provided with an internal channel, an airflow inlet and an airflow outlet, the airflow inlet and the airflow outlet are formed in the two sides of the internal channel, the test blades are sequentially arranged in the internal channel at intervals, and airflow channels are formed in the two sides of the test blades. The test tube comprises a first side plate and a second side plate which are used for limiting the two opposite sides of the internal channel, the first side plate is provided with a first flow channel surface right opposite to the test blades, the suction surfaces of the test blades face the first flow channel surface, and the molded line of the first flow channel surface is consistent with the pressure surface. The second side plate is provided with a second flow channel face right opposite to the test blades, the pressure faces of the multiple test blades face the second flow channel face, and the molded line of the second flow channel face is consistent with the suction face, so that the flow condition of head and tail channels is improved, the periodicity is improved, and the accuracy of the test structure is improved.

Description

Technical Field

[0001] This invention relates to the field of aero-engine testing technology, and more specifically, to a planar blade cascade testing device. Background Technology

[0002] High-pressure compressors are crucial components of aero engines. The aerodynamic design of multi-stage, high-load high-pressure compressors is challenging and costly to test. Blades are a core component of the compressor. Before designing multi-stage compressor components, planar blade cascade tests are typically conducted on basic airfoils at a certain blade height to obtain characteristics such as angle of attack, flight angle, and losses, which guide the compressor's aerodynamic design. Furthermore, studying the aerodynamic performance of basic airfoils in compressor cascades can validate compressor blade design methods, refine loss models, and lay the foundation for establishing a compressor blade cascade test database.

[0003] In planar blade cascade experiments, the periodicity of the flow field significantly impacts the accuracy of the results. In a real compressor environment, the basic airfoil operates in an environment similar to an infinite cascade, with nearly uniform flow conditions across all cascade channels. Due to space and structural constraints, planar blade cascade experiments typically involve a limited number of cascades, with baffles used to enclose the lead and tail blades. The baffles result in poor periodicity of the lead and tail blades during the experiment; the separation of the lead and tail blades also affects the flow in other blade channels, further deteriorating their periodicity and thus impacting the accuracy of the results. Therefore, overcoming the influence of baffles on the periodicity of planar blade cascade experiments is crucial. Furthermore, conventional planar blade cascade experiments require a specialized rotary table, which is costly to manufacture, and the angle adjustment mechanism is complex. Summary of the Invention

[0004] The purpose of this invention is to provide a planar blade cascade testing device that can improve the technical problems of poor periodicity of blade channels and low accuracy of test results in the prior art.

[0005] Embodiments of the present invention can be implemented in the following ways:

[0006] A planar blade cascade testing device includes a test tube and multiple test blades. The test tube has an internal channel and airflow inlets and outlets formed on both sides of the internal channel. The multiple test blades are arranged sequentially at intervals in the internal channel, and airflow channels are formed on both sides of the test blades. The two sides of the test blades are a pressure surface and a suction surface, respectively.

[0007] The test tube includes a first side plate and a second side plate for defining opposite sides of the internal channel. The first side plate has a first flow channel surface facing the test blades, the suction surfaces of the plurality of test blades face the first flow channel surface, and the profile of the first flow channel surface is consistent with the pressure surface. The second side plate has a second flow channel surface facing the test blades, the pressure surfaces of the plurality of test blades face the second flow channel surface, and the profile of the second flow channel surface is consistent with the suction surface.

[0008] Optionally, the test tube further includes a third side plate and a fourth side plate defining opposite sides of the internal channel. The third side plate, the first side plate, the fourth side plate, and the second side plate are connected end to end to circumferentially enclose the internal channel. A first mounting hole is provided on the third side plate, and a second mounting hole is provided on the fourth side plate. The test blade includes a blade body and a first rotating shaft and a second rotating shaft provided at both ends of the blade body. The first rotating shaft is rotatably connected to the first mounting hole, and the second rotating shaft is rotatably connected to the second mounting hole, so that the angle of the test blade relative to the airflow inlet direction can be adjusted.

[0009] Optionally, the planar blade test device further includes an adjustment mechanism connected to the plurality of test blades to drive the plurality of test blades to rotate synchronously.

[0010] Optionally, the adjusting mechanism includes a rack and a plurality of driven gears, the plurality of driven gears being mounted one-to-one on the plurality of test blades, and the rack meshing with the plurality of driven gears.

[0011] Optionally, the adjustment mechanism includes a driving gear, a plurality of intermediate gears, and a plurality of driven gears, the plurality of driven gears being mounted one-to-one on the plurality of test blades; an intermediate gear is disposed between two adjacent driven gears, and the intermediate gear meshes with the two adjacent driven gears; the driving gear meshes with one of the driven gears or one of the intermediate gears to drive the plurality of driven gears to rotate synchronously and in the same direction.

[0012] Optionally, the first mounting hole is a through hole penetrating the third side plate; the test blade also has a square head located on the side of the first rotating shaft opposite to the blade body, the square head being located on the outside of the third side plate, and the square head being engaged and fixed with the driven gear.

[0013] Optionally, the second mounting hole is a blind hole with the bottom closed.

[0014] Optionally, the first side plate further includes a first inlet section, one end of which forms the airflow inlet, and the other end of which is rotatably connected to the first flow channel surface so that the first flow channel surface remains parallel to the pressure surface of the test blade.

[0015] Optionally, the second side plate further includes a second inlet section, one end of which forms the airflow inlet, and the other end of which is rotatably connected to the second flow channel surface so that the second flow channel surface remains parallel to the suction surface of the test blade.

[0016] Optionally, the first side plate further includes a first outlet section, one end of which forms the airflow outlet, and the other end of which is connected to the first flow channel surface, and the first outlet section is tangent to the first flow channel surface.

[0017] The second side plate also includes a second outlet section, one end of which forms an airflow outlet, and the other end of which is connected to the second flow channel surface, and the second outlet section is tangent to the second flow channel surface.

[0018] The beneficial effects of the planar blade cascade testing apparatus provided in the embodiments of the present invention include:

[0019] An embodiment of the present invention provides a planar blade cascade testing device, comprising a test tube and a plurality of test blades. The test tube has an internal channel and airflow inlets and outlets formed on both sides of the internal channel. The plurality of test blades are sequentially spaced within the internal channel, and airflow channels are formed on both sides of the test blades. The two sides of the test blades are pressure surfaces and suction surfaces, respectively. The test tube includes a first side plate and a second side plate for defining opposite sides of the internal channel. The first side plate has a first flow channel surface facing the test blades, and the suction surfaces of the plurality of test blades face the first flow channel surface, and the profile of the first flow channel surface is consistent with the pressure surface. The second side plate has a second flow channel surface facing the test blades, and the pressure surfaces of the plurality of test blades face the second flow channel surface, and the profile of the second flow channel surface is consistent with the suction surface. By setting the first flow channel surface to a pressure surface shape and the second flow channel surface to a suction surface shape, it helps to improve the flow conditions at the beginning and end of the channel, enhance periodicity, and thus improve the accuracy of the test structure. Attached Figure Description

[0020] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0021] Figure 1A schematic diagram of the planar cascade test apparatus according to one aspect of the present invention is shown from a first perspective.

[0022] Figure 2 A schematic diagram of the planar cascade test apparatus according to one aspect of the present invention is shown from a second perspective.

[0023] Figure 3 A schematic diagram of the internal structure of a planar blade cascade test apparatus according to one aspect of the present invention is shown;

[0024] Figure 4 A schematic diagram of the structure of the third side plate in a planar blade cascade test apparatus provided according to one aspect of the present invention is shown;

[0025] Figure 5 A schematic diagram of the structure of the fourth side plate in a planar blade cascade test apparatus provided according to one aspect of the present invention is shown;

[0026] Figure 6 A schematic diagram of the structure of a test blade in a planar blade cascade test apparatus provided according to one aspect of the present invention is shown;

[0027] Figure 7 A comparative simulation result diagram is shown according to one aspect of the present invention;

[0028] Figure 8 A simulation result diagram of an embodiment provided according to one aspect of the present invention is shown.

[0029] Figure label:

[0030] 100-Planar blade test device; 110-Test tube; 111-First side plate; 112-First inlet section; 113-First flow channel surface; 114-First outlet section; 115-Second side plate; 116-Second inlet section; 117-Second flow channel surface; 118-Second outlet section; 119-Third side plate; 121-First mounting hole; 122-Fourth side plate; 123-Second mounting hole; 124-Internal channel; 125-Airflow inlet; 126-Airflow outlet; 127-Inlet section; 128-Test section; 129-Outlet section; 130-Test blade; 131-Blade body; 132-First rotating shaft; 133-Second rotating shaft; 134-Square head; 135-Pressure surface; 136-Suction surface; 140-Adjustment mechanism; 141-Driving gear; 142-Driven gear; 143-Intermediate gear. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0032] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0033] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0034] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Figure 1 This is a schematic diagram of the planar blade cascade test apparatus 100 provided in this embodiment from a first viewing angle. Figure 2 This is a schematic diagram of the planar blade cascade testing device 100 provided in this embodiment from a second perspective. Figure 3 This is a schematic diagram of the internal structure of the planar blade cascade testing device 100 provided in this embodiment. Please refer to the attached diagram. Figures 1-3 This embodiment provides a planar blade cascade testing device 100, which includes a test tube 110 and a plurality of test blades 130. The test tube 110 has an internal channel 124 and airflow inlets 125 and airflow outlets 126 formed on both sides of the internal channel 124. The plurality of test blades 130 are sequentially spaced in the internal channel 124, and airflow channels are formed on both sides of the test blades 130. The test tube 110 includes a first side plate 111 and a second side plate 115 for defining opposite sides of the internal channel 124. The first side plate 111 has a first flow channel surface 113 facing the test blades 130. The suction surfaces 136 of the plurality of test blades 130 face the first flow channel surface 113, and the profile of the first flow channel surface 113 is consistent with the pressure surface 135. The second side plate 115 has a second flow channel surface 117 that is directly opposite to the test blade 130. The pressure surfaces 135 of the multiple test blades 130 face the second flow channel surface 117, and the profile of the second flow channel surface 117 is consistent with the suction surface 136.

[0036] The planar blade cascade test apparatus 100 provided in this embodiment will be further described below:

[0037] Please continue to refer to the reference. Figures 1-3 In this embodiment, the test tube 110 is a square tubular component, which includes a first side plate 111, a second side plate 115, a third side plate 119, and a fourth side plate 122. The first side plate 111, the third side plate 119, the second side plate 115, and the fourth side plate 122 are connected end to end to form a circumferentially closed internal channel 124, and the two ends of the internal channel 124 are open, thereby forming an airflow inlet 125 and an airflow outlet 126. During the test, the test tube 110 is connected to an external air supply source, and high-pressure gas is supplied to the test tube 110 through the external air supply source. The high-pressure gas enters the internal channel 124 from the airflow inlet 125, flows along the internal channel 124, and then flows out from the airflow outlet 126.

[0038] Specifically, the internal channel 124 has an air inlet section, a test section 128, and an air outlet section arranged sequentially from the air inlet 125 to the air outlet 126. Correspondingly, the first side plate 111 has a first inlet section 112 and a first outlet section 114. The first inlet section 112 and the first outlet section 114 are located on both sides of the first flow channel surface 113. In other words, one end of the first inlet section 112 forms the air inlet 125, and the other end of the first inlet section 112 is connected to the first flow channel surface 113; one end of the first outlet section 114 forms the air outlet 126, and the other end of the first outlet section 114 is connected to the first flow channel surface 113.

[0039] Similarly, the second side plate 115 has a second inlet section 116 and a second outlet section 118, which are located on both sides of the second flow channel surface 117. In other words, one end of the second inlet section 127 forms an airflow inlet 125, and the other end of the second inlet section 127 is connected to the second flow channel surface 117; one end of the second outlet section 129 forms an airflow outlet 126, and the other end of the second outlet section 129 is connected to the second flow channel surface 117.

[0040] The inlet section is a straight channel formed between the first inlet section 112 and the second inlet section 116, the outlet section is a straight channel formed between the first outlet section 114 and the second outlet section 118, and the test section 128 is a curved channel formed between the first flow channel surface 113 and the second flow channel surface 117. Multiple test blades 130 are disposed in the test section 128 and are distributed sequentially at intervals along the direction from the first flow channel surface 113 to the second flow channel surface 117. Thus, the airflow path of the test section 128 is divided into multiple airflow channels by the multiple test blades 130. The airflow from the inlet section flows along the airflow channels to the outlet section under the action of the multiple test blades 130. Meanwhile, among the multiple test blades 130, the one closest to the first flow channel surface 113 is the first test blade 130, and the one closest to the second flow channel surface 117 is the second test blade 130. The first test blade 130 and the first flow channel surface 113 are spaced apart, thus forming a channel for airflow between the first test blade 130 and the first flow channel surface 113. Similarly, the second test blade 130 and the second flow channel surface 117 are spaced apart.

[0041] The airflow channel between two adjacent test blades 130 is defined by the pressure surface 135 of one test blade 130 and the suction surface 136 of the other test blade 130. Since the suction surface 136 of the test blade 130 faces the first flow channel surface 113, the channel between the first flow channel surface 113 and the first test blade 130 is also defined by the pressure surface 135 and the suction surface 136. Correspondingly, the pressure surface 135 of the test blade 130 faces the second flow channel surface 117, so the channel between the second flow channel surface 117 and the second test blade 130 is also defined by the pressure surface 135 and the suction surface 136.

[0042] Figure 4 This is a schematic diagram of the third side plate 119 in the planar blade cascade test device 100 provided in this embodiment. Figure 5 This is a schematic diagram of the structure of the fourth side plate 122 in the planar blade cascade test device 100 provided in this embodiment. Figure 6 This is a schematic diagram of the structure of the test blade 130 in the planar blade cascade test apparatus 100 provided in this embodiment. Please refer to the diagram. Figures 1-6In this embodiment, the test blade 130 includes a blade body 131 and a first rotating shaft portion 132 and a second rotating shaft portion 133 at both ends of the blade body 131, designed by the designer. The two opposite sides of the blade body 131 are a suction surface 136 and a pressure surface 135, respectively. A first mounting hole 121 is provided on the third side plate 119, and a second mounting hole 123 is provided on the fourth side plate 122. The first rotating shaft portion 132 is rotatably connected to the first mounting hole 121, and the second rotating shaft portion 133 is rotatably connected to the second mounting hole 123, thereby allowing the test blade 130 to adjust its angle relative to the airflow inlet 125, thereby changing the blade angle of attack and realizing the aerodynamic characteristic test of the blade cascade at different angles, reducing the difficulty of the test.

[0043] Specifically, the third side plate 119 is located on the upper side of the internal channel 124, and the fourth side plate 122 is located on the lower side of the internal channel 124. The first rotating shaft 132 is rotatably connected to the first mounting hole 121 of the third side plate 119, and the second rotating shaft 133 is rotatably connected to the second mounting hole 123 of the fourth side plate 122. Thus, the blade body 131 is located between the third side plate 119 and the fourth side plate 122, thereby defining the airflow channel through the adjacent blade bodies 131.

[0044] Furthermore, the planar blade test device 100 also includes an adjustment mechanism 140, which is connected to multiple test blades 130, thereby driving the multiple test blades 130 to rotate synchronously.

[0045] Optionally, the adjusting mechanism 140 includes a driving gear 141, multiple intermediate gears 143, and multiple driven gears 142. The multiple driven gears 142 are mounted one-to-one on multiple test blades 130. An intermediate gear 143 is positioned between two adjacent driven gears 142, and the intermediate gear 143 meshes with both adjacent driven gears 142. Thus, rotational force is transmitted from one driven gear 142 to another driven gear 142 via the intermediate gear 143, ensuring that the multiple driven gears 142 rotate in the same direction. The driving gear 141 meshes with one of the driven gears 142 or one of the intermediate gears 143 to drive the multiple driven gears 142 to rotate synchronously and in the same direction. Figure 1 As shown, the driving gear 141 meshes with one of the driven gears 142 to achieve synchronous rotation of multiple driven gears 142. It can be understood that in some other embodiments, the driving gear 141 may also be configured to mesh with the intermediate gear 143.

[0046] It should be noted that the adjustment mechanism 140 includes, but is not limited to, a gear transmission structure. It can be understood that, for example, in some other embodiments, the adjustment mechanism 140 can also be set as a gear and rack structure. Specifically, in this case, the adjustment mechanism 140 includes a rack and a plurality of driven gears 142. The plurality of driven gears 142 are mounted one-to-one on the plurality of test blades 130, and the rack meshes with the plurality of driven gears 142. In this way, when the rack moves linearly, it can synchronously drive the plurality of driven gears 142 to rotate synchronously in the same direction.

[0047] Optionally, the first mounting hole 121 is a through hole penetrating the third side plate 119. The test blade 130 also has a square head 134 located on the side of the first rotating shaft portion 132 opposite to the blade body 131. During installation, the first rotating shaft portion 132 is inserted into the first mounting hole 121, the blade body 131 is located inside the third side plate 119, and the square head 134 is located outside the third side plate 119. The square head 134 is engaged and fixed with the driven gear 142, so that the adjustment mechanism 140 is located outside the test tube 110.

[0048] It should be noted that in the description of this embodiment, "inner side" and "outer side" are relative to the orientation of the internal flow channel. The inner side of the third side plate 119 refers to the side of the third side plate 119 that is close to the internal flow channel, and correspondingly, the outer side of the third side plate 119 refers to the side of the third side plate 119 that is away from the internal flow channel.

[0049] Optionally, the second mounting hole 123 is a blind hole with a closed bottom. The top of the second mounting hole 123 is located on the side of the fourth side plate 122 near the internal flow channel, and an opening communicating with the internal flow channel is formed there. The bottom of the second mounting hole 123 does not penetrate the fourth side plate 122. The fourth side plate 122 is a closed plate, which helps to ensure that the internal flow channel is closed on this side.

[0050] In this embodiment, the first side plate 111 and the second side plate 115 are integral plate-shaped components. Therefore, when the test blade 130 rotates at a certain angle, the relative angle between the first flow channel surface 113 and the pressure surface 135 of the test blade 130 will change. Similarly, the relative angle between the second flow channel surface 117 and the suction surface 136 of the test blade 130 will also change. In other embodiments, to further improve the accuracy of the test results, the first side plate 111 and the second side plate 115 can be configured such that the first flow channel surface 113 and the second flow channel surface 117 can rotate with the test blade 130.

[0051] For example, the first inlet section 112 is rotatably connected to the first flow channel surface 113 so that the first flow channel surface 113 can be adjusted while the test blade 130 is rotating, so that the first flow channel surface 113 remains parallel to the pressure surface 135 of the test blade 130. Correspondingly, the second inlet section 116 is rotatably connected to the second flow channel surface 117 so that the second flow channel surface 117 can be adjusted while the test blade 130 is rotating, so that the second flow channel surface 117 remains parallel to the suction surface 136 of the test blade 130. Optionally, the first flow channel surface 113 is fixedly connected to the first outlet section 114. The second flow channel surface 117 is fixedly connected to the second outlet section 118.

[0052] In this embodiment, the first outlet section 114 is tangent to the first flow channel surface 113; the second outlet section 118 is tangent to the second flow channel surface 117.

[0053] To verify the effectiveness of the planar blade cascade test device 100, the inventors conducted a comparative experiment, using the structure of a test device in the prior art as a comparative example and the planar blade cascade test device 100 provided by the present invention as an embodiment, such as... Figure 7 The simulation results are shown in the comparative scale, such as... Figure 8 The simulation results of the embodiment are shown, and for this purpose... Figure 7 and Figure 8 It can be seen that the baffles on both sides of the comparative example are straight, and significant flow separation occurs in the channels on both sides. Figure 7 The black part located in the channel has poor flow field periodicity; however, the baffles on both sides of the embodiment are respectively set as suction surface 136 and pressure surface 135, which significantly weakens the flow field separation and improves the flow field uniformity.

[0054] The planar blade cascade test apparatus 100 provided in the embodiments of the present invention reduces flow field separation and improves flow field uniformity by setting the side plate portions located on both sides of the test blade 130 in the test tube 110 into suction surfaces 136 and pressure surfaces 135. Simultaneously, an adjustment mechanism 140 is provided, which, through the driven gear 142, allows for easy adjustment of the angle of attack of the test blade 130, thereby recording aerodynamic characteristics at different angles and reducing test costs.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A planar blade cascade testing device, comprising a test tube and a plurality of test blades, the test tube having an internal channel and airflow inlets and outlets formed on both sides of the internal channel, the plurality of test blades being sequentially spaced within the internal channel, and airflow channels forming on both sides of the test blades; the two sides of the test blades being a pressure surface and a suction surface, respectively; characterized in that, The test tube includes a first side plate and a second side plate for defining opposite sides of the internal channel. The first side plate has a first flow channel surface facing the test blades, the suction surfaces of the plurality of test blades face the first flow channel surface, and the profile of the first flow channel surface is consistent with the pressure surface. The second side plate has a second flow channel surface facing the test blades, the pressure surfaces of the plurality of test blades face the second flow channel surface, and the profile of the second flow channel surface is consistent with the suction surface.

2. The planar blade cascade test apparatus according to claim 1, characterized in that, The test tube further includes a third side plate and a fourth side plate defining opposite sides of the internal channel. The third side plate, the first side plate, the fourth side plate, and the second side plate are connected end to end to circumferentially enclose the internal channel. A first mounting hole is provided on the third side plate, and a second mounting hole is provided on the fourth side plate. The test blade includes a blade body and a first rotating shaft and a second rotating shaft provided at both ends of the blade body. The first rotating shaft is rotatably connected to the first mounting hole, and the second rotating shaft is rotatably connected to the second mounting hole, so that the angle of the test blade relative to the airflow inlet direction can be adjusted.

3. The planar blade cascade test apparatus according to claim 2, characterized in that, The planar blade test device also includes an adjustment mechanism, which is connected to the plurality of test blades to drive the plurality of test blades to rotate synchronously.

4. The planar blade cascade test apparatus according to claim 3, characterized in that, The adjustment mechanism includes a rack and multiple driven gears, which are mounted one-to-one on the multiple test blades, and the rack meshes with the multiple driven gears.

5. The planar blade cascade test apparatus according to claim 3, characterized in that, The adjustment mechanism includes a driving gear, multiple intermediate gears, and multiple driven gears, with the multiple driven gears mounted one-to-one on the multiple test blades; an intermediate gear is disposed between two adjacent driven gears, and the intermediate gear meshes with the two adjacent driven gears; The driving gear meshes with one of the driven gears or one of the intermediate gears to drive the plurality of driven gears to rotate synchronously in the same direction.

6. The planar blade cascade test apparatus according to claim 4 or 5, characterized in that, The first mounting hole is a through hole that penetrates the third side plate; the test blade also has a square head located on the side of the first rotating shaft opposite to the blade body, the square head is located on the outside of the third side plate, and the square head is engaged and fixed with the driven gear.

7. The planar blade cascade test apparatus according to claim 2, characterized in that, The second mounting hole is a blind hole with the bottom closed.

8. The planar blade cascade test apparatus according to claim 2, characterized in that, The first side plate also includes a first inlet section, one end of which forms the airflow inlet, and the other end of which is rotatably connected to the first flow channel surface so that the first flow channel surface remains parallel to the pressure surface of the test blade.

9. The planar blade cascade test apparatus according to claim 2, characterized in that, The second side plate also includes a second inlet section, one end of which forms the airflow inlet, and the other end of which is rotatably connected to the second flow channel surface so that the second flow channel surface remains parallel to the suction surface of the test blade.

10. The planar blade cascade test apparatus according to claim 1, characterized in that, The first side plate also includes a first outlet section, one end of which forms the airflow outlet, and the other end of which is connected to the first flow channel surface, and the first outlet section is tangent to the first flow channel surface. The second side plate also includes a second outlet section, one end of which forms an airflow outlet, and the other end of which is connected to the second flow channel surface, and the second outlet section is tangent to the second flow channel surface.

Images