Blade air film hole flow resistance detection clamp

Abstract

The utility model provides a blade air film hole flow resistance detection clamp which comprises a detection water path which is communicated with an air inlet of a blade to enable detection water to flow through an air film hole in the blade from the air inlet, a water tank, a water supply pipeline and a water inlet control valve, a top opening of the water tank is communicated with the air inlet of the blade in a fluid sealing mode, and the water supply pipeline is communicated with the water inlet control valve. The water supply pipeline communicates with the water supply device and the water tank. The water inlet control valve is arranged on the water supply pipeline to control water supply to the water tank. The pressing device presses the water tank to the air inlet end of the blade, particularly, the detection water path is a low-pressure detection water path, the pressing device comprises a connecting base fixedly arranged relative to the blade and a pressing air cylinder installed at the bottom of the connecting base, and a piston rod of the pressing air cylinder is fixedly connected to the bottom wall of the water tank; the pressing force towards the blade is provided for the water tank in the detection process. The blade air film hole flow resistance detection clamp has the advantages of being convenient to implement, simple in structure, low in cost and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of the machining of turbine blade film holes, and particularly belongs to a fixture for detecting the flow resistance of turbine blade film holes. Background Art

[0002] In an aeroengine, the high-pressure turbine blade is located at the position with the highest temperature and the most complex stress, so it must have quite strong temperature-bearing capacity. In the design of advanced aeroengines, in addition to using high-temperature-resistant materials and special heat treatment processes, a large number of cooling film holes are also used on the hollow turbine blades. The purpose is to form a complete cooling film on the blade surface to improve the cooling effect and temperature-bearing capacity of the blade during operation.

[0003] The film holes are usually distributed in parts such as the leading edge, the blade profile surface, and the flange of the hollow turbine blade, and have the characteristics of small aperture, large number, large depth-diameter ratio, and complex spatial angles. Their dimensional parameters and flow resistance will have an important impact on the film cooling effect. Due to the inconsistent relative positions of the blade profiles and the blade cavities of each blade, it is impossible to ensure that all holes pass through the expected inner cavity wall when machining the film holes. Moreover, the film holes are based on cylindrical holes as the basic hole type, with discrete distribution, complex spatial angles, and different angles for the film holes in the same row. Coupled with the particularity and complexity of the blade profile surface structure, it makes the machining of the film holes and the detection of the machining quality of the film holes quite difficult.

[0004] For example, as an aspect of the quality detection of film holes, the flow resistance of film holes is an important index for the forming quality of film holes. However, due to the aforementioned characteristics of film holes, it is obviously impossible to achieve through direct observation. At present, the detection of the flow resistance of turbine blade film holes includes, for example, Pin detection, air flow detection, water flow detection, and thermal imaging detection, etc. Each method has its own advantages and disadvantages, but there are deficiencies such as expensive equipment, complexity, and cumbersome operation. Therefore, it is necessary to provide a device for detecting the flow resistance of blade film holes that is easy to implement, simple in structure, and low in cost. Summary of the Utility Model

[0005] The present disclosure aims to provide a fixture for detecting the flow resistance of blade film holes, which at least partially eliminates the defects existing in the prior art.

[0006] One object of the present disclosure is to solve the problems that the existing detection means are not easy to implement and complex to operate.

[0007] Another object of the present disclosure is to provide a fixture for detecting the flow resistance of blade film holes with a simple structure and low cost.

[0008] Another object of the present disclosure is to provide a fixture for detecting the flow resistance of blade film holes that is easy to implement and has desired stability and reliability.

[0009] To solve the above technical problems, according to one aspect of the present disclosure, a detection fixture for the flow resistance of blade film holes is provided, including: a detection waterway that communicates with the air inlet of the blade so that the detection water flows through the film holes in the blade from the air inlet. The detection waterway includes a water tank, a water supply pipe, and a water inlet control valve. The top opening of the water tank is fluid-sealedly connected to the air inlet of the blade. The water supply pipe connects the water supply device and the water tank, and the water inlet control valve is arranged on the water supply pipe to control the water supply to the water tank; and a pressing device that presses the water tank against the air inlet end of the blade. In particular, the detection waterway is a low-pressure detection waterway, and the pressing device includes a connecting seat fixedly arranged relative to the blade and a pressing cylinder installed at the bottom of the connecting seat. The piston rod of the pressing cylinder is fixedly connected to the bottom wall of the water tank to provide a pressing force towards the blade for the water tank during the detection process.

[0010] In the present disclosure, by adopting a low-pressure detection waterway, the requirements for the device performance are greatly reduced, thus saving costs, being easy to implement, and having simple operation. By combining the auxiliary pressing of the pressing cylinder, good sealing between the water tank and the blade is ensured, thus guaranteeing the stability and reliability of the detection fixture.

[0011] Specifically, the connecting seat includes a bottom plate and a pair of side walls arranged opposite to each other perpendicular to the bottom plate. The top end of each side wall includes a claw extending towards the inside of the connecting seat. Among them, the water tank is arranged on the bottom plate so that when the claw is clamped on the blade, the bottom plate of the connecting seat presses the water tank against the air inlet end of the blade.

[0012] Furthermore, the bottom wall of the water tank is fixedly connected to the top end of the piston rod of the pressing cylinder through a connecting member penetrating the bottom plate of the connecting seat, so that the water tank can move closer to or away from the blade relative to the piston rod's telescoping. Among them, the bottom plate of the connecting seat has a through hole for the connecting member to pass through unobstructed. Exemplarily, the aforementioned connecting member is a bolt.

[0013] The assembly method of the pressing cylinder, the connecting seat, and the water tank makes the structure simple, easy to implement, and cost-saving, which allows the detection fixture of the present disclosure to achieve effective sealing and detection through a simple structure, guaranteeing the safety of the test process and the reliability of the test results.

[0014] Preferably, a buffer member abutting against the bottom wall of the water tank is arranged on the bottom plate of the connecting seat. On the one hand, this buffer member can avoid the collision between the bottom plate of the connecting seat and the water tank, thereby avoiding deformation or damage caused by the collision; on the other hand, it can reduce the requirements for the dimensional design, processing accuracy, installation accuracy, etc. of the structures such as the connecting seat, the water tank, and the clamping groove of the blade.

[0015] In particular, the pressing device further includes a low-pressure pneumatic circuit. The pressing cylinder is connected to the low-pressure pneumatic circuit, and the low-pressure pneumatic circuit further includes a booster pump and a pneumatic control element. The booster pump is used to provide pressurized gas for the pressing cylinder, and the pneumatic control element is arranged between the booster pump and the pressing cylinder to control the gas supply of the booster pump to the pressing cylinder.

[0016] The detection fixture of the present disclosure can ensure the detection of the flow resistance of the blade film cooling holes by using a low-pressure pneumatic circuit, which reduces the requirements for the device performance, and has significant advantages over the prior art in terms of cost savings, operation simplicity, operation safety, etc.

[0017] Optionally, the gas pressure provided by the booster pump is not higher than 10 bar.

[0018] Optionally, the pneumatic control element is a pneumatic foot valve. The pneumatic foot valve has a pedal and an inlet pipe and an outlet pipe connected to the pressing cylinder, and is configured to supply and exhaust gas to the pressing cylinder in response to the pressing operation of the pedal. This pneumatic foot valve has the advantages of convenient operation and flexible setting.

[0019] Preferably, an elastic seal is provided at the top opening of the water tank. The elastic seal is configured to closely fit to the sealing surface of the inlet end of the blade during the detection process, so as to enhance the fluid seal between the water tank and the inlet end.

[0020] According to the technical solution of the present disclosure, the synergistic effect of the elastic seal, the fixture and the pressing cylinder jointly ensures an effective fluid seal between the water tank and the inlet end of the blade, and ensures the stability and reliability of the detection fixture.

[0021] Optionally, the inlet control valve is arranged on the side wall of the water tank, which can make the detection fixture have a more compact and simple structure and is convenient for controlling the supply of the detection water.

[0022] Furthermore, the low-pressure detection water circuit may further include a water collecting tank for collecting the detection water discharged from the film cooling holes, a filter for filtering the detection water collected by the water collecting tank, and a circulation pump for transporting the detection water filtered by the filter to the water supply device. This setting makes the low-pressure detection water circuit form a complete closed-loop circuit, and the detection water can be recycled, which not only avoids waste of water resources and saves costs, but also avoids environmental pollution caused by wastewater discharge.

[0023] The flow resistance detection fixture for blade film cooling holes of the present disclosure generally includes a connecting seat, a detection water circuit where the water tank is located, and a pneumatic circuit where the pressing cylinder is located. It has a simple structure and is easy to implement. In particular, compared with existing high-pressure water detection, Pin detection, air flow detection, thermal imaging detection, etc., the present disclosure can ensure effective detection of the flow resistance of blade film cooling holes only by using a low-pressure water circuit and a low-pressure booster device, reducing the requirements for the device performance, and having significant advantages in terms of cost savings, operation simplicity, result reliability, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Through the following description with reference to the drawings, the features and advantages of one or several embodiments of the present utility model will become more easily understood. The drawings described herein are only for illustrative purposes and are not intended to limit the scope of the present utility model in any way. The drawings are not drawn to scale, and some features may be enlarged or reduced to show details of specific components. In the drawings:

[0025] Figure 1 is a partial cross-sectional view of the assembled state of the flow resistance detection fixture for blade film cooling holes according to an embodiment of the present disclosure and the blade;

[0026] Figure 2 is a schematic diagram of the flow resistance detection fixture for blade film cooling holes according to an embodiment of the present disclosure.

[0027] Description of the reference numerals in the drawings:

[0028] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] Next, the technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present disclosure.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless otherwise clearly specified in the context, the singular form is also intended to include the plural form.

[0031] Figure 1 is a partial cross-sectional view of the assembled state of the flow resistance detection fixture for blade film cooling holes according to an embodiment of the present disclosure and the blade.

[0032] As Figure 1As shown, the flow resistance detection fixture for the blade film cooling holes according to an embodiment of the present disclosure generally includes a detection water circuit where the water tank 30 is located and a pressing device. The pressing device includes a connecting seat 20 and a pneumatic circuit where the pressing cylinder 40 is located. Among them, the detection water circuit communicates from the water tank 30 to the air inlet 14 of the blade 10 so that the detection water from the water tank 30 flows from the air inlet 14 into the blade cavity 12, then flows through the blade cavity 12 and passes through the connected film cooling holes 15, and finally flows out from the film cooling holes 15.

[0033] In this way, by visually observing the state of the water flow flowing out from the film cooling holes 15, the flow resistance of the film cooling holes 15 can be determined. Therefore, the structure of this detection fixture is simple, the operation is convenient, and it is easy to implement.

[0034] Furthermore, the detection water circuit mainly includes: a water tank 30, the top opening of the water tank 30 is fluid-sealedly communicated with the air inlet 14 of the blade 10. Specifically, the top opening of the water tank 30 is tightly abutted against the sealing surface 16 at the air inlet end of the blade 10 to form a fluid seal; a water supply pipe, the water supply pipe communicates the water supply device and the water tank 30 to transport the detection water from the water supply device to the water tank 30; and a water inlet control valve 32, the water inlet control valve 32 is arranged on the water supply pipe to control the water supply to the water tank 30.

[0035] The connecting seat 20 is used to connect the water tank 30 to the air inlet end of the blade 10. Figure 2 As can be seen, the connecting seat 20 includes a bottom plate 22 and a pair of side walls 24 arranged oppositely perpendicular to the bottom plate 22. The top end of each side wall 24 includes a claw 25 extending towards the inside of the connecting seat 20. The claw 25 can be clamped with the groove 18 at the air inlet end of the blade 10, so as to realize the fixed connection between the connecting seat 20 and the blade 10. Among them, the water tank 30 is arranged on the bottom plate 22. When the claw 25 is clamped on the blade 10, the bottom plate 22 of the connecting seat 20 can press the water tank 30 against the air inlet end of the blade 10.

[0036] Different from the prior art detection method using high-pressure water, as an advantageous aspect of the present disclosure, the detection water circuit in the present disclosure can be a low-pressure detection water circuit. For example, the maximum water pressure can not exceed 7 bar, which greatly reduces the requirements for the device structure and performance, thus saving costs and being easy to implement.

[0037] To ensure that the top opening of the water tank 30 is always in close contact with the sealing surface 16 at the air inlet end of the blade 10 during the detection process, the pressing device further includes a pressing cylinder 40 fixedly installed at the bottom of the connecting seat 20. The piston rod 42 of the pressing cylinder 40 is fixedly connected to the bottom wall of the water tank 30 to provide a pressing force towards the sealing surface 16 of the blade 10 for the water tank 30 during the detection process. Among them, the top end of the pressing cylinder 40 can be detachably installed at the bottom of the connecting seat 20 by bolts, so the assembly is simple and easy to implement.

[0038] Specifically, referring to Figure 1 and Figure 2 , the bottom wall of the water tank 30 is fixedly connected to the top end of the piston rod 42 of the pressing cylinder 40 via a connecting member 50 passing through the bottom plate 22 of the connecting seat 20, so that the water tank 30 moves closer to or away from the blade 10 relative to the piston rod 42 as the piston rod 42 expands and contracts. Among them, the bottom plate 22 of the connecting seat 20 has a through hole for the connecting member 50 to pass through unobstructed. In this way, during the detection process, by supplying pressurized gas to the pressing cylinder 40, the piston of the pressing cylinder 40 drives the piston rod 42 to move upward, so that the piston rod 42 applies a pressing force towards the sealing surface 16 of the blade 10 to the bottom wall of the water tank 30. In this way, in the state where the connecting seat 20 clamps the water tank 30, further with the pressing force provided by the pressing cylinder 40, it is ensured that the water tank 30 stably compresses the sealing surface 16 of the blade 10 during the detection process, so that the low-pressure water flow can smoothly flow into the specified blade cavity 12 without leakage.

[0039] The above settings make the detection fixture of the present disclosure convenient to assemble, cost-saving, and easy to implement, and can achieve effective sealing through a simple structure, ensuring the safety of the test process and the reliability of the test results.

[0040] As a schematic implementation manner, the connecting member 50 can be a bolt, and its two ends are respectively fixedly connected to the piston rod 42 and the bottom wall of the water tank. However, the connecting member 50 can also have other different structures and connection methods. For example, it can also be a connecting rod installed by welding, clamping, etc.

[0041] Preferably, a buffer member 60 abutting against the bottom wall of the water tank 30 is provided on the bottom plate 22 of the connecting seat 20. The buffer member 60 can be in any form such as a spring, an elastic gasket, etc. On the one hand, it can avoid the collision between the bottom plate 22 of the connecting seat 20 and the water tank 30, thereby avoiding deformation or damage caused by the collision; on the other hand, it can reduce the requirements for the dimensional design, processing accuracy, installation accuracy, etc. of the structures such as the connecting seat 20, the water tank 30, and the clamping groove 18 of the blade.

[0042] As an advantageous aspect of the present disclosure, the pressing cylinder 40 is connected to a low-pressure pneumatic circuit, which further includes: a booster pump (not shown) that supplies low-pressure boosted gas to the pressing cylinder 40; and a pneumatic control element 44 disposed between the booster pump and the pressing cylinder 40 to control the gas supply of the booster pump to the pressing cylinder 40. In the present disclosure, since the pressure of the detected water is relatively low, for example, not higher than 7 bar, the air pressure used to provide the pressing force can also be relatively low, and the gas pressure provided by the booster pump can be not higher than 10 bar, for example, only 7 bar.

[0043] However, in the present disclosure, the pressure values involved in the "low-pressure water circuit", "low-pressure pneumatic circuit" and "booster pump" are not limited by the exemplary values provided in the above specific embodiments, but are based on the general knowledge of those skilled in the art. The pressure ranges that are relatively low or significantly reduced compared to the prior art all belong to the "low-pressure" range of the present disclosure.

[0044] Therefore, the present disclosure can ensure the detection of the flow resistance of the blade air film holes by using low-pressure detected water and a low-pressure boosting device, reduces the requirements for the device performance, and has significant advantages over the prior art in terms of cost savings, operation simplicity, structural simplification, result reliability, etc.

[0045] As an example, the pneumatic control element 44 can be a pneumatic foot valve. This pneumatic foot valve has a pedal 45 and an air inlet pipe 46 and an air outlet pipe 47 connected to the pressing cylinder 40, and it also has an air inlet pipeline connected to the booster pump. The pneumatic foot valve is configured to control the gas supply of the booster pump to the pressing cylinder 40 in response to the pressing or stepping operation on the pedal 45, so as to realize the control of the gas supply and exhaust of the pressing cylinder 40. The use of the pneumatic foot valve is simple. Before the detection starts, by pressing or stepping on the pedal 45, the pressing cylinder 40 can be switched from the non-gas supply state to the gas supply state, that is, the piston rod 42 is switched from the retracted state to the extended state, so as to press the water tank 30 against the sealing surface 16 of the blade 10; when the detection is completed, pressing or stepping on the pedal 45 again can switch the pressing cylinder 40 from the gas supply state to the exhaust state (non-gas supply state), that is, the piston rod 42 is switched from the extended state to the retracted state, so as to release the pressing force applied to the water tank 30.

[0046] The pneumatic foot valve has the advantages of convenient operation and flexible setting. However, the type of the pneumatic control element 44 is not limited to this, but other types of elements can be used to replace it according to actual needs.

[0047] To further ensure a good seal between the top opening of the water tank 30 and the sealing surface 16 of the blade 10, an elastic seal 34 is also provided at the top opening of the water tank 30, such asFigure 2 As shown, the elastic seal 34 is embedded in the upper surface with an open top. During the detection process, the pressing force provided by the connecting seat 20 and the pressing cylinder 40 enables it to closely fit the sealing surface 16 at the air inlet end of the blade. The combined action of the elastic seal 34, the connecting seat 20, and the pressing cylinder 40 ensures effective fluid sealing between the water tank 30 and the air inlet end, thereby enhancing the stability and reliability of the detection fixture.

[0048] However, the above-described embedded elastic seal 34 is merely an example. According to actual requirements, other types of seals can also be used, which may not be embedded but coated or adhered to the top opening of the water tank 30.

[0049] In addition, as Figure 1 and Figure 2 shown, the water inlet control valve 32 can be provided on the side wall of the water tank 30. This further makes the detection fixture have a more compact and simple structure, and facilitates operating the water inlet control valve 32 to control the supply of detection water during the detection process.

[0050] Furthermore, although not shown, in actual applications, the detection water path can further include: a water collecting tank for collecting the detection water discharged from the air film holes 15. The detection process can be implemented on a test platform, and the water collecting tank can be integrally provided with the test platform. When the detection water is discharged from the air film holes 15, it can automatically flow into the water collecting tank for collection; a filter for filtering the detection water collected by the water collecting tank for reuse; and a circulation pump that can transport the detection water filtered by the filter to the water supply device. Through this setting, the low-pressure detection water path according to the present disclosure forms a complete closed-loop circuit, and the detection water can be recycled, which not only avoids waste of water resources and saves costs, but also avoids environmental pollution caused by wastewater discharge.

[0051] Summary: The blade air film hole flow resistance detection fixture of the present disclosure generally includes a connecting seat, a detection water path where the water tank is located, and a pneumatic circuit where the pressing cylinder is located. The main improvement lies in that the present disclosure can ensure effective detection of the flow resistance of the blade air film hole by using low-pressure detection water and a low-pressure boosting device, reducing the requirements for the device performance, and having significant advantages over the prior art in terms of cost savings, operational simplicity, structural simplification, and result reliability.

[0052] The advantages of the blade air film hole flow resistance detection fixture of the present disclosure are as follows:

[0053] ① By adopting a low-pressure detection water path, the requirements for the device performance are greatly reduced, thereby saving costs and being easy to implement.

[0054] ②Using only a clamping device with a low-pressure pneumatic circuit can ensure the tight fit between the water tank and the blade, reducing the requirements for the structure and performance of the clamping device. Moreover, it has significant advantages over the prior art in terms of cost savings, operational simplicity, and operational safety.

[0055] ③The pressing cylinder is detachably mounted at the bottom of the connecting seat by bolts. The bottom wall of the water tank is fixedly connected to the top end of the piston rod of the pressing cylinder through bolts passing through the bottom plate of the connecting seat. The detection fixture with this structure is convenient to assemble, cost-saving, and easy to implement. It can achieve effective sealing and testing through a simple structure, and ensures the safety of the testing process and the reliability of the test results.

[0056] ④A buffer member that abuts against the bottom wall of the water tank is provided on the bottom plate of the connecting seat. On the one hand, it can avoid the collision between the bottom plate of the connecting seat and the water tank, thereby avoiding deformation or damage caused by the collision. On the other hand, it can reduce the requirements for the dimensional design, machining accuracy, installation accuracy, etc. of the structures such as the connecting seat, the water tank, and the clamping groove of the blade.

[0057] ⑤The pneumatic control element uses a pneumatic foot valve, which has the advantages of convenient operation and flexible setting.

[0058] ⑥An elastic seal is also provided at the top opening of the water tank. The elastic seal, together with the pressing force provided by the fixture and the pressing cylinder, jointly ensures effective fluid sealing between the water tank and the air inlet end of the blade, thereby enhancing the stability and reliability of the detection fixture.

[0059] ⑦The water inlet control valve is provided on the side wall of the water tank, making the detection fixture have a more compact and simple structure and facilitating the control of the supply of the detection water.

[0060] ⑧The detection water circuit can also include a water collecting tank, a filter, and a circulation pump, so that the low-pressure detection water circuit forms a complete closed-loop circuit, and the detection water can be recycled. This not only avoids waste of water resources and saves costs, but also avoids environmental pollution caused by wastewater discharge.

[0061] The above has specifically described various embodiments and variations of the present invention. However, those skilled in the art should understand that the present invention is not limited to the above specific embodiments and variations, but can include other various possible combinations and associations. Other variations and variants can be implemented by those skilled in the art without departing from the essence and scope of the present invention. All these variations and variants fall within the scope of the present invention. Moreover, all the components described herein can be replaced by other technically equivalent components.

Claims

1. A fixture for detecting the flow resistance of film holes on a blade, comprising: A detection water circuit, the detection water circuit being connected to the air inlet (14) of the blade (10) so that the detection water flows through the film holes (15) in the blade (10) from the air inlet (14). The detection water circuit includes: A water tank (30), the top opening of the water tank (30) being fluid-sealedly connected to the air inlet (14) of the blade (10), A water supply pipe, the water supply pipe connecting a water supply device and the water tank (30), and An inlet control valve (32), the inlet control valve (32) being arranged on the water supply pipe to control the water supply to the water tank (30); and A pressing device, the pressing device pressing the water tank (30) against the air inlet end of the blade (10); Characterized in that, The detection water circuit is a low-pressure detection water circuit; and The pressing device includes a connecting seat (20) fixedly arranged relative to the blade (10) and a pressing cylinder (40) installed at the bottom of the connecting seat (20). The piston rod (42) of the pressing cylinder (40) is fixedly connected to the bottom wall of the water tank (30) to provide a pressing force towards the blade (10) for the water tank (30) during the detection process.

2. The leaf air film hole flow resistance detection fixture according to claim 1, wherein The connecting seat (20) includes a bottom plate (22) and a pair of side walls (24) arranged opposite to each other perpendicular to the bottom plate (22). The top end of each side wall (24) includes a claw (25) extending towards the inside of the connecting seat (20). Wherein, the water tank (30) is arranged on the bottom plate (22) such that when the claw (25) is clamped on the blade (10), the bottom plate (22) of the connecting seat (20) presses the water tank (30) against the air inlet end of the blade (10).

3. The leaf air film hole flow resistance detection fixture according to claim 2, wherein The bottom wall of the water tank (30) is fixedly connected to the top end of the piston rod (42) of the pressing cylinder (40) via a connecting member (50) passing through the bottom plate (22) of the connecting seat (20), so that the water tank (30) can approach or move away from the blade (10) relative to the piston rod (42) as the piston rod (42) expands and contracts, Wherein, the bottom plate (22) of the connecting seat (20) has a through hole for the connecting member (50) to pass through unobstructed.

4. The leaf air film hole flow resistance detection fixture according to claim 2, characterized in that, A buffer member (60) abutting against the bottom wall of the water tank is arranged on the bottom plate (22) of the connecting seat (20).

5. The leaf air film hole flow resistance detection fixture according to any one of claims 1 to 4, characterized in that The pressing device further includes a low-pressure pneumatic circuit, the pressing cylinder (40) being connected in the low-pressure pneumatic circuit. The low-pressure pneumatic circuit further includes: A booster pump for providing boosted gas for the pressing cylinder (40); and A pneumatic control element (44), the pneumatic control element (44) being arranged between the booster pump and the pressing cylinder (40) to control the gas supply of the booster pump to the pressing cylinder (40).

6. The leaf air film hole flow resistance detection fixture according to claim 5, characterized in that The gas pressure provided by the booster pump is not higher than 10 bar.

7. The leaf air film hole flow resistance detection fixture according to claim 5, characterized in that, The pneumatic control element (44) is a pneumatic foot valve which has a pedal (45) and an intake pipe (46) and an exhaust pipe (47) connected to the pressing cylinder (40), and is configured to supply air to and exhaust air from the pressing cylinder (40) in response to a pressing operation on the pedal (45).

8. The leaf air film hole flow resistance detection fixture according to any one of claims 1 to 4, characterized in that An elastic seal (34) is provided at the top opening of the water tank (30), and the elastic seal (34) is configured to closely fit to the sealing surface (16) at the intake port end of the blade during the detection process, so as to enhance the fluid seal between the water tank (30) and the intake port end.

9. The leaf air film hole flow resistance detection fixture according to any one of claims 1 to 4, characterized in that The water inlet control valve (32) is provided on the side wall of the water tank (30).

10. The leaf gas film hole flow resistance detection fixture according to any one of claims 1 to 4, characterized in that, The detection water path further includes: A water collecting tank for collecting the detection water discharged from the air film holes (15); A filter for filtering the detection water collected by the water collecting tank; and A circulation pump for transporting the detection water filtered by the filter to the water supply device.

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