Suction device for boundary layer in compressor cascade test

Abstract

The application discloses a suction device applied to boundary layer of a compressor cascade test, which comprises a suction position adjusting structure group, a suction flow control assembly and a blade group, and each side of the blade group is connected with one suction position adjusting structure in the suction position adjusting structure group. Each suction position adjusting structure in the suction position adjusting structure group comprises a grid plate, a suction cover, a suction conduit group and a gas tank suction conduit, and the grid plate is provided with a blade mounting groove group and a suction gap groove group. The suction cover is internally provided with a closed chamber, and a steady flow plate is arranged at a preset height of the closed chamber. The suction flow control assembly comprises a confluence tank, a flow meter, an adjusting valve and a vacuum suction pump. The embodiment can reduce the difficulty of adjusting the boundary layer suction position, reduce the complexity of a test bench structure, the manufacturing cost and the test maintenance difficulty, improve the aerodynamic performance of the blade and reduce the difference of test data.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of turbomachinery testing technology, and more specifically to a suction device for the boundary layer of a compressor blade cascade test. Background Technology

[0002] The suction device applied to the suction surface layer in compressor blade tests can actively control boundary layer flow to optimize the aerodynamic performance of the blades. Currently, the common approach is as follows: the traditional suction device is fixed to the test bench with an integrated welded frame. The vacuum chamber and pipes mounted on the frame are not removable, and additional small holes and gaps need to be made in the blades or end walls, a vacuum chamber needs to be set inside the blades, and fixed pipelines need to be installed in the connection channel between the suction device and the external suction equipment.

[0003] However, in practice, it has been found that the following technical problems are frequently encountered when using traditional suction devices:

[0004] Because traditional suction devices are fixed to the test bench by integrated welding, the grid plates cannot be disassembled according to the geometric parameters of different blades or test requirements. This makes it difficult to adjust the suction slots, thus increasing the difficulty of the experiment. In addition, the additionally designed small holes, gaps, vacuum chambers and pipelines are easily blocked by particles, which increases the maintenance difficulty of the test bench and the manufacturing cost of the test bench. When faced with high suction flow requirements, there are many suction holes in ineffective suction positions, resulting in low accuracy of experimental data, poor suction effect, and excessive energy consumption during the operation of the suction equipment.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background of the present disclosure concept, and therefore may contain information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0006] The summary portion of this disclosure is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description portion that follows. This summary portion is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0007] Some embodiments of this disclosure propose a suction device for the boundary layer of a compressor blade cascade test to solve the technical problems mentioned in the background section above.

[0008] In a first aspect, some embodiments of this disclosure provide a suction device for the boundary layer of a compressor blade cascade test, characterized in that the suction device includes a suction position adjustment structure group, a suction flow control component, and a blade group, wherein each side of the blade group is connected to a suction position adjustment structure in the suction position adjustment structure group; each suction position adjustment structure in the suction position adjustment structure group includes a grid plate, a suction hood, a suction conduit group, and a gas collecting tank suction conduit; the grid plate is provided with a blade mounting groove group and a suction slot groove group; the suction slot groove group... The position of the assembly is variable. The number of the blade mounting slot assembly and the suction slot assembly are the same. The grid plate, the suction hood, the suction conduit assembly, and the gas collecting tank suction conduit are all detachable. The suction hood has a sealed chamber inside. A flow stabilizing plate is provided at a preset height in the sealed chamber. The flow stabilizing plate has a first preset number of through holes for dispersing airflow. The suction flow control assembly includes a manifold, a flow meter, a regulating valve, and a vacuum suction pump. The suction flow control assembly is used to control the suction flow of the suction device.

[0009] Optionally, the suction device further includes a gas collecting tank, one side of the grid plate is connected to one side of the blade assembly, the other side of the grid plate is connected to one side of the suction hood, the other side of the suction hood is connected to one end of the suction conduit assembly, the other end of the suction conduit assembly is connected to one side of the gas collecting tank, and the other side of the gas collecting tank is connected to one end of the gas collecting tank suction conduit.

[0010] Optionally, a second preset number of pneumatic connectors are provided on the side of the gas collecting tank connected to the suction conduit assembly. The second preset number of pneumatic connectors are used to connect the gas collecting tank and the suction conduit assembly. In use, the suction conduit assembly is used to guide the gas drawn from the suction slit groove assembly from the suction hood to the gas collecting tank.

[0011] Optionally, a flange is provided at the connection between the gas collecting tank and the gas collecting tank suction pipe. The gas collecting tank is used to collect the gas flow from the component flow in the suction pipe. The gas collecting tank suction pipe is used to transport the pressure-equalized gas flow in the gas collecting tank to the manifold. The flange is used to connect the gas collecting tank and the gas collecting tank suction pipe.

[0012] Optionally, the other end of the gas collecting tank suction conduit is connected to the manifold, and the manifold is connected to the vacuum suction pump through a flow-adjustable pipe. The flow-adjustable pipe is equipped with a flow meter and a regulating valve. The flow meter is adjacent to the manifold, and the regulating valve is adjacent to the vacuum suction pump.

[0013] Optionally, the aforementioned grid plate, the aforementioned suction hood, the aforementioned suction conduit assembly, and the aforementioned gas collecting tank suction conduit are used to adjust the suction position and suction flow rate of the aforementioned suction device.

[0014] Optionally, the outer wall of the suction shroud is provided with a second preset number of threaded holes, the second preset number of threaded holes are connected to one end of a second preset number of quick-connect connectors, and the other end of the quick-connect connectors are connected to one end of the suction conduit assembly, the suction conduit assembly including the second preset number of suction conduits.

[0015] Optionally, the suction slot group and the blade mounting slot group are equally spaced on the grid plate. One side of the blade group is embedded in the blade mounting slot group. Each blade in the blade group includes a suction surface and a pressure surface. The suction surface is the convex surface of the blade, and the pressure surface is the concave surface of the blade. Each suction slot in the suction slot group has adjacent blades on its left and right sides. The distance between the suction slot and the pressure surface of the adjacent blade on the left is a first preset distance. The suction slot and the adjacent blade on the right are... The distance between the suction surfaces is a second preset distance. The left side of each suction slot in the suction slot group is adjacent to the pressure surface of one of the blades in the blade group, and the right side of the suction slot is adjacent to the suction surface of one of the blades in the blade group. The distance between the suction slot and the suction surface is a first preset distance, and the distance between the suction slot and the suction surface is a second preset distance. The second preset distance is greater than the first preset distance. The shape of the suction slot is the same as the shape of the suction surface profile of the suction surface.

[0016] Optionally, a sealed pressure chamber is provided on the right side of the aforementioned suction slit groove. A pressure guiding hole is provided on the front wall of the sealed pressure chamber. A gas channel is provided between each pair of adjacent blades in the aforementioned blade group. The sealed pressure chamber is connected to the gas channel through the provided pressure guiding hole. A primary piston and a secondary piston are provided in the sealed pressure chamber. The right end face of the primary piston is connected to the left end face of the secondary piston. In the initial state, the left end face of the primary piston is directly opposite the pressure guiding hole. The distance between the left end face and the pressure guiding hole is a third preset distance. A spring is connected to the right end face of the secondary piston. The spring is made of shape memory alloy. The spring is initially in a compressed state. The surface of the spring is coated with a graphene coating. A detachable ceramic heating element is embedded in the side wall of the sealed pressure chamber. The distance between the ceramic heating element and the spring is a fourth preset distance.

[0017] Optionally, the aforementioned suction device further includes an ultraviolet light-emitting diode, a spectrometer, an angle-of-attack sensor, a pressure sensor group, and a processor. The surface of each blade in the blade group is coated with a fluorescent coating, and the processor is further configured to perform the following steps: in response to determining that the vacuum suction pump is in a start-up state, receiving angle-of-attack information collected by the angle-of-attack sensor, suction surface pressure distribution information collected by the pressure sensor group, and a set of fluorescence intensity information collected by the spectrometer; determining pressure gradient information based on the angle-of-attack information and the suction surface pressure distribution information; and determining pressure gradient information based on the set of fluorescence intensity information and... A pre-trained degradation coefficient model is used to determine the degradation coefficient information of the corresponding fluorescent coating. Based on the aforementioned angle of attack information, suction surface pressure distribution information, and degradation coefficient information, the multimodal flow field characteristics of the corresponding flow field are determined. Based on the aforementioned pressure gradient information, degradation coefficient information, and multimodal flow field characteristics, key flow rate information is determined. Based on the aforementioned key flow rate information, angle of attack information, pressure gradient information, and degradation coefficient information, a nonlinear mapping function is determined. Based on the aforementioned nonlinear mapping function, target flow rate information is determined. Based on the aforementioned target flow rate information, the aforementioned regulating valve is controlled to adjust the flow rate.

[0018] In a second aspect, some embodiments of this disclosure provide an electronic device, including: one or more processors; and a storage device having one or more programs stored thereon, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method described in any of the implementations of the first aspect above.

[0019] The above-described embodiments of this disclosure have the following beneficial effects: the suction device applied to the boundary layer of compressor blade test according to some embodiments of this disclosure can reduce the difficulty of adjusting the boundary layer suction position, reduce the complexity of the test bench structure, manufacturing cost and test maintenance difficulty, improve the aerodynamic performance of the blade, thereby reducing the occurrence of poor test data and reducing the energy consumption during the operation of the suction equipment. The existing technologies suffer from difficulties in adjusting the boundary layer suction position, complex test bench structures, high manufacturing costs and maintenance difficulties, and low blade aerodynamic performance, resulting in poor experimental data and high energy consumption during suction equipment operation. These issues arise because traditional suction devices are integrally welded to the test bench, making it impossible to disassemble the grid plates according to different blade geometry or experimental requirements. This makes adjusting the suction slot difficult, thus increasing experimental complexity. Furthermore, the additionally designed small holes, gaps, vacuum chambers, and pipelines are easily clogged by particles, increasing the maintenance difficulty of the test bench and raising its manufacturing cost. When facing high suction flow requirements, many suction holes are in ineffective suction positions, leading to low experimental data accuracy, poor suction performance, and excessive energy consumption during operation. Based on this, some embodiments of the present disclosure describe a suction device applied to the boundary layer of a compressor blade cascade test. The suction device comprises a suction position adjustment structure group, a suction flow control component, and a blade group. Each side of the blade group is connected to a suction position adjustment structure in the suction position adjustment structure group. Each suction position adjustment structure in the suction position adjustment structure group includes a grid plate, a suction hood, a suction conduit group, and a gas collecting tank suction conduit. The grid plate has a blade mounting groove group and a suction slot groove group. The positions of the groups are variable, and the number of the blade mounting slot groups and the suction slot groups are the same. The grid plate, the suction hood, the suction conduit group, and the gas collecting tank suction conduit are all detachable. The suction hood has a sealed chamber inside, and a flow stabilizing plate is provided at a preset height in the sealed chamber. The flow stabilizing plate has a preset number of through holes for dispersing the airflow. The suction flow control component includes a manifold, a flow meter, a regulating valve, and a vacuum suction pump. The suction flow control component is used to control the suction flow of the suction device. Because each suction position adjustment structure in the above-mentioned suction position adjustment structure group includes a grid plate, and the grid plate has a blade mounting groove group and a suction slit groove group, and since the grid plate, the suction hood, the suction conduit group and the gas collecting tank suction conduit are all detachable, the position of the suction slit groove group is variable. Therefore, the opening position of the suction slit groove can be adjusted by replacing the grid plate, reducing the difficulty of adjusting the suction slit groove and thus reducing the difficulty of experimental operation. The position of the suction slit groove can be adjusted, thereby improving the accuracy of experimental data, improving the suction effect, and reducing the energy consumption of the suction equipment during operation.Furthermore, since the aforementioned suction flow control assembly includes a manifold, flow meter, regulating valve, and vacuum suction pump, and is used to control the suction flow of the aforementioned suction device, different suction flow rates can be allocated at different suction positions, reducing excessive energy consumption during the operation of the suction equipment unit. Also, because each suction position adjustment structure in the aforementioned suction position adjustment structure group, including the grid plate, suction hood, suction conduit assembly, and gas collection tank suction conduit, is detachable, the difficulty of test maintenance can be reduced, and it can be flexibly used on different test benches. It is not necessary to have a suction device fixedly connected to each test bench, reducing the number of required suction devices and lowering the manufacturing cost of the test benches. Attached Figure Description

[0020] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and elements are not necessarily drawn to scale.

[0021] Figure 1 This is a schematic diagram of the structure of the suction device applied to the boundary layer of a compressor blade cascade test according to the present disclosure;

[0022] Figure 2 This is a schematic diagram of the internal grid plate of the suction device applied to the boundary layer of a compressor blade test according to the present disclosure;

[0023] Figure 3 This is a schematic diagram of the suction hood inside the suction device used in the boundary layer test of a compressor blade cascade according to the present disclosure;

[0024] Figure 4 This is a schematic diagram of the flow stabilizer plate inside the suction device applied to the boundary layer of a compressor blade test according to the present disclosure;

[0025] Figure 5 This is a schematic diagram of the internal gas collection tank of the suction device used in the boundary layer test of a compressor blade cascade according to the present disclosure.

[0026] Figure 6 This is a schematic diagram of the structure of an electronic device suitable for implementing some embodiments of the present disclosure.

[0027] In the diagram: 1. Blade; 2. Grid plate; 3. Suction hood; 4. Quick connector; 5. Suction conduit; 6. Quick connector; 7. Gas collection tank; 8. Gas collection tank suction conduit; 9. Manifold; 10. Flow meter; 11. Regulating valve; 12. Vacuum pump; 13. Blade mounting slot; 14. Suction slot; 15. Flow stabilizer. Detailed Implementation

[0028] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0029] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0030] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0031] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0032] The names of messages or information exchanged between multiple devices in the embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

[0033] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] Figure 1 This is a structural schematic diagram of a suction device for use in the boundary layer of a compressor blade test, based on the present disclosure. Figure 1 The system may include a suction position adjustment structure assembly, a suction flow control assembly, and a blade assembly. The suction position adjustment structure assembly may include a grid plate 2, a suction hood 3, a suction conduit assembly, and a gas collection tank suction conduit 8. The suction flow control assembly may include a manifold 9, a flow meter 10, a regulating valve 11, and a vacuum pump 12. The blade assembly may include blades 1.

[0035] Figure 2 It may include a covered area A of a grid plate 2, a blade mounting groove 13, a suction slot groove 14, and a suction hood 3.

[0036] Figure 3 It may include a suction cover 3, a quick-connect plug 4, and a flow stabilizer 15.

[0037] Figure 4 It may include a flow stabilizer 15.

[0038] Figure 5 It may include a quick-connect fitting 6 and a gas collection tank 7.

[0039] In some embodiments, such as Figure 1 As shown, the above-mentioned suction device may include a suction position adjustment structure group, a suction flow control component, and a blade group.

[0040] In some embodiments, each side of the blade assembly is connected to a suction position adjustment structure in the suction position adjustment structure assembly.

[0041] In some embodiments, each suction position adjustment structure in the suction position adjustment structure group may include a grid plate 2, a suction hood 3, a suction conduit group, and a gas collection tank suction conduit 8. The grid plate 2 may have a blade mounting groove group and a suction slot group. The position of the suction slot group may be variable. The number of blade mounting groove groups and suction slot groups may be the same. The grid plate 2, the suction hood 3, the suction conduit group, and the gas collection tank suction conduit 8 are all detachable. The number of blade mounting grooves 13 in the blade mounting groove group and the number of suction slots 14 in the suction slot group may both be eight. The type and number of blade groups can be adjusted according to different experimental requirements. Here, the type and number of blade groups are not specifically limited. Each blade 1 in the blade group may be fixed to one blade mounting groove 13 in the blade mounting groove group by tenon and mortise. The grid plate 2 and the suction hood 3 may both be made of stainless steel. Here, the materials of the aforementioned grid plate 2 and suction hood 3 are not specifically limited, nor is the connection method between the aforementioned blade 1 and the aforementioned blade mounting groove 13, and can be adjusted according to actual conditions. The position of the aforementioned suction slot 14 within the aforementioned suction slot can be preset. Here, the specific position of the aforementioned suction slot 14 within the aforementioned suction slot is not limited, and can be adjusted according to actual needs. It should be noted that since the aforementioned grid plate 2, the aforementioned suction hood 3, the aforementioned suction conduit assembly, and the aforementioned gas collecting tank suction conduit 8 are all detachable, the position of the aforementioned suction slot assembly is variable, and the position of the suction slot 14 can be adjusted by replacing the aforementioned grid plate 2. Here, the specific method for determining the position of the aforementioned suction slot within the aforementioned suction slot is not limited, and can be adjusted according to actual needs. For example, the position of the suction slot within the aforementioned suction slot can be pre-researched using fluid dynamics numerical simulation software.

[0042] In some embodiments, the interior of the suction hood 3 is a sealed chamber. A flow stabilizing plate 15 is provided at a predetermined height within the sealed chamber. The flow stabilizing plate 15 has a first predetermined number of through holes. These first predetermined number of through holes can be used to disperse the airflow. The suction hood 3 and the grid plate 2 can be connected by bolts. Figure 2As shown in the figure, the area A covered by the suction hood 3 represents the region covered by the suction hood 3 and the suction slot group. The connection method between the suction hood 3 and the grid plate 2 is not specifically limited and can be adjusted according to specific circumstances. The mounting surfaces connecting the suction hood 3 and the grid plate 2 can be sealed with sealant to form a closed chamber. The sealant can be silicone sealant, which can achieve vacuum sealing under conditions of large vibration and temperature fluctuations. The type of sealant is not specifically limited and can be adjusted according to actual conditions. The closed chamber provides a stable and uniform airflow input to the suction device, improving the accuracy of suction flow control and the reliability of the suction device operation. The preset height of the closed chamber represents the distance between the flow stabilizer 15 and the bottom of the suction hood 3. The preset height can be in the range of 40-60 mm. The bottom of the aforementioned suction hood 3 can be the side where the suction hood 3 is connected to the aforementioned suction conduit assembly. The aforementioned preset height range allows for a more uniform airflow velocity distribution within the suction device. Here, the preset height of the aforementioned flow stabilizer 15 is not specifically limited and can be adjusted according to specific circumstances. The aforementioned flow stabilizer 15 can be made of stainless steel, a material that ensures long-term structural stability. Here, the material of the aforementioned flow stabilizer 15 is not specifically limited and can be adjusted according to specific circumstances. The aforementioned first preset number of through holes can be evenly distributed on the aforementioned flow stabilizer 15. The range of the first preset number of through holes can be 500 to 1000. Setting the number of through holes to the first preset number can improve flow field uniformity and match dynamic flow requirements. The diameter of the aforementioned through holes can be in the range of 3 to 5 mm. This diameter range can balance airflow dispersion and pressure loss. If the through holes are too small, it will increase the resistance encountered during airflow; if the through holes are too large, it will reduce the flow stabilization effect. The thickness of the aforementioned through holes can range from 3 to 6 mm. This thickness range can improve structural rigidity and reduce resonance caused by airflow vibration. No specific limitations are placed on the diameter, number, or thickness of the through holes; adjustments can be made according to specific circumstances.

[0043] In some embodiments, the suction flow control component may include a manifold 9, a flow meter 10, a regulating valve 11, and a vacuum pump 12. This component can be used to control the suction flow rate of the suction device. The manifold 9 may be a horizontal manifold. The flow meter 10 may be a thermal mass flow meter. The regulating valve 11 may be an electrically operated regulating valve. The vacuum pump 12 may be a rotary vane vacuum pump. The types of the manifold 9, flow meter 10, regulating valve 11, and vacuum pump 12 are not specifically limited and can be adjusted according to actual conditions.

[0044] Optionally, the suction device may further include a gas collecting tank 7. One side of the grid plate 2 may be connected to one side of the blade assembly. The other side of the grid plate 2 may be connected to one side of the suction hood 3. The other side of the suction hood 3 may be connected to one end of the suction conduit assembly. The other end of the suction conduit assembly may be connected to one side of the gas collecting tank 7. The other side of the gas collecting tank 7 may be connected to one end of the gas collecting tank suction conduit 8. The gas collecting tank 7 may be a horizontal gas collecting tank. The type of gas collecting tank 7 is not specifically limited and can be adjusted according to actual needs. The diameter of the gas collecting tank suction conduit 8 may be 8 mm. The type of gas collecting tank suction conduit 8 may be a nylon flexible hose. The diameter of the gas collecting tank suction conduit 8 is not limited and can be adjusted according to actual requirements.

[0045] Optionally, the gas collecting tank 7 may have a second preset number of pneumatic connectors on the side connected to the suction conduit assembly. These second preset number of pneumatic connectors can be used to connect the gas collecting tank 7 and the suction conduit assembly. In use, the suction conduit assembly guides the gas drawn from the suction slot assembly from the suction hood 3 to the gas collecting tank 7. Setting the number of pneumatic connectors helps to ensure uniform suction and reduce dead zones in the airflow. The type of pneumatic connector can be a quick-connect pneumatic connector, and the material of the pneumatic connector can be polyurethane. Here, the type and material of the pneumatic connector are not specifically limited and can be adjusted according to specific circumstances.

[0046] Optionally, a flange may be provided at the connection between the gas collecting tank 7 and the gas collecting tank suction conduit 8. The gas collecting tank 7 can be used to collect the gas streams diverted by the suction conduit. The gas collecting tank suction conduit 8 can be used to transport the pressure-equalized gas stream in the gas collecting tank 7 to the manifold 9. The flange can be used to connect the gas collecting tank 7 and the gas collecting tank suction conduit 8. The flange may be a necked flat-welded flange, which can distribute welding stress and reduce thin-wall deformation of the gas collecting tank. The type of flange is not specifically limited and can be adjusted according to specific circumstances.

[0047] Optionally, the other end of the gas collecting tank suction conduit 8 can be connected to the manifold 9. The manifold 9 and the vacuum suction pump 12 can be connected via a flow-adjustable pipeline. The flow-adjustable pipeline can be equipped with a flow meter 10 and a regulating valve 11. The flow meter 10 can be adjacent to the manifold 9. The regulating valve 11 can be adjacent to the vacuum suction pump 12. The flow meter 10 can be connected to the flow-adjustable pipeline via a flange. The regulating valve 11 can be connected to the flow-adjustable pipeline via a flange. Here, the connection method of the flow meter 10, the regulating valve 11, and the flow-adjustable pipeline is not specifically limited and can be adjusted according to specific circumstances. The diameter of the flow-adjustable pipeline can be in the range of 60-90 mm. The diameter range of the flow-adjustable pipeline can provide sufficient flow capacity within the required flow range of the suction device, while reducing the situation where the flow rate is too low due to excessive diameter. The aforementioned flow-adjustable pipe can be made of stainless steel, and its type can be corrugated. No specific limitations are placed on the diameter, material, and type of the aforementioned flow-adjustable pipe; adjustments can be made according to actual conditions.

[0048] Optionally, the aforementioned grid plate 2, suction hood 3, suction conduit assembly, and gas collecting tank suction conduit 8 can be used to adjust the suction position and suction flow rate of the suction device. Specifically, the suction position of the suction device can be adjusted by replacing the grid plate 2 to change the opening position of the suction slot 14; the suction flow rate can be adjusted by replacing the suction conduit assembly and gas collecting tank suction conduit 8 with different diameters, thereby adjusting the suction rate.

[0049] Optionally, the outer wall surface of the suction shroud 3 may be provided with a second preset number of threaded holes. These second preset number of threaded holes may be connected to one end of a second preset number of quick-connect fittings 6. The other end of the second preset number of quick-connect fittings 6 may be connected to one end of the suction conduit assembly. The suction conduit assembly may include a second preset number of suction conduits 5. Each threaded hole in the second preset number of threaded holes is connected to a quick-connect fitting 6. Each suction conduit 5 in the suction conduit assembly is connected to a quick-connect fitting 6. The threaded holes in the second preset number of threaded holes, the quick-connect fittings 4 in the second preset number of quick-connect fittings 6, and the suction conduits 5 in the suction conduit assembly are in one-to-one correspondence. The threaded holes may be evenly distributed on the outer wall surface of the suction shroud 3. The second preset number may be 56. The number of threaded holes helps to ensure even suction and reduce dead zones in the airflow. The quick-connect plug 4 mentioned above can be a quick-connect pneumatic connector, and its material can be stainless steel. The type of quick-connect connector 6 reduces the need for complex threaded connections or welding, simplifying the setup and adjustment process of the test apparatus. Here, the type of quick-connect plug 4 is not specifically limited and can be adjusted according to specific circumstances. The suction tube 5 in the suction tube assembly can be made of rubber, and its material supports quick connection and disassembly, adapting to the need for frequent gas path adjustments. The diameter of the suction tube 5 can be in the range of 8–15 mm, balancing flow rate, pressure loss, and ease of installation. Here, the number, material, and diameter of the suction tubes 5 are not specifically limited and can be adjusted according to specific circumstances.

[0050] Optionally, the suction slot group and the blade mounting slot group are equally spaced on the grid plate 2. One side of the blade group is embedded in the blade mounting slot group. Each blade 1 in the blade group includes a suction surface and a pressure surface. The suction surface is the convex surface of the blade 1, and the pressure surface is the concave surface of the blade 1. Each suction slot 14 in the suction slot group has adjacent blades on its left and right sides. The distance between the suction slot 14 and the pressure surface of the adjacent blade on the left is a first preset distance, and the distance between the suction slot 14 and the suction surface of the adjacent blade on the right is a second preset distance. The second preset distance is greater than the first preset distance. The shape of the suction slot 14 is the same as the shape of the suction surface profile of the suction surface. The distance between any two adjacent suction slots in the suction slot group is equal. The distance between any two adjacent blade mounting slots in the blade mounting slot group is equal. The first preset distance can be in the range of 1 to 5 mm. If the first preset distance is too small, it may cause friction between the blade 1 and the groove, resulting in vibration or wear. If the first preset distance is too large, it may reduce the suction efficiency, leading to airflow leakage or flow field turbulence. The width of the suction slot 14 can be in the range of 4 to 6 mm. The width of the suction slot 14 can reduce the occurrence of blockage and airflow disturbance. The second preset distance can be in the range of 10 to 30 mm. If the second preset distance is too small, it may cause interference between the suction shroud 3 and the compressor or affect the thermal expansion space of the blade 1. If the distance is too large, it may reduce the suction efficiency and increase pressure loss. The shape of the suction surface profile can be arc-shaped. In operation, the vacuum pump 12 starts and forms a negative pressure source. The negative pressure source is sequentially connected to the suction slot 14, the suction hood 3, the gas collection tank 7, the manifold tank 9, and the vacuum pump 12 to form a negative pressure link. When the airflow flows between each pair of adjacent blades in the blade group, the blade group performs boundary layer separation on the flowing airflow. The separated low-energy airflow is sucked into the sealed chamber by the suction slot group. The airflow in the sealed chamber passes through the flow stabilizer 15 and is then diverted to the gas collection tank 7 via the suction conduit group. The collected airflow is then circulated to the manifold tank 9 via the suction conduit 8 of the gas collection tank. The airflow in the manifold tank 9 flows to the vacuum pump 12 through the flow-adjustable pipe. The flow meter 10 installed on the flow-adjustable pipe can monitor the flow rate of the flow-adjustable pipe in real time, so that the flow rate of the flow-adjustable pipe can be adjusted by the regulating valve 11.

[0051] In the process of adopting technical solutions to address the aforementioned technical problems, the following technical problem two often arises: In the scenario of high-load compressor design verification, traditional fixed-size suction slots are difficult to adapt to the variable operating conditions of the compressor. Under low angle of attack or low flow rate conditions, excessively large suction slots will draw in too much mainstream fluid, leading to a decrease in the aerodynamic performance of the blades. Conversely, under high angle of attack or stall conditions, excessively small suction slots cannot effectively suppress separation, resulting in increased total pressure loss and poor suction performance. To address this second technical problem, the conventional solution is to pre-install suction slot grids of various specifications, which are then disassembled and replaced during shutdown to match different operating conditions. However, considering the shortcomings of simply disassembling and replacing them to match different operating conditions, and leveraging the advantages of our company in developing suction devices for the boundary layer of compressor blade testing, we have decided to adopt the following solution:

[0052] Optionally, a sealed pressure chamber is provided on the right side of the aforementioned suction slit groove. A pressure guiding hole is provided on the front wall of the sealed pressure chamber. A gas channel exists between each pair of adjacent blades in the aforementioned blade assembly. The sealed pressure chamber communicates with the gas channel through the pressure guiding hole. A primary piston and a secondary piston are provided within the sealed pressure chamber. The right end face of the primary piston is connected to the left end face of the secondary piston. Initially, the left end face of the primary piston faces the pressure guiding hole, and the distance between the left end face and the pressure guiding hole is a third preset distance. A spring is connected to the right end face of the secondary piston. The spring is made of shape memory alloy and is initially in a compressed state. The surface of the spring is coated with a graphene coating. A detachable ceramic heating element is embedded in the side wall of the sealed pressure chamber, and the distance between the ceramic heating element and the spring is a fourth preset distance. The sealed pressure chamber can be a closed cavity structure that can accommodate the primary and secondary pistons and transmit gas pressure. The aforementioned pressure guiding hole can be a small hole opened on the front wall of the aforementioned sealed pressure chamber, used to connect the aforementioned sealed pressure chamber with the aforementioned gas passage. The connection method between the aforementioned primary piston and the aforementioned secondary piston can be a bolt connection. The aforementioned third preset distance can be in the range of 1 to 2 mm. The connection method between the aforementioned primary piston and the aforementioned secondary piston is not specifically limited and can be adjusted according to the actual situation. The aforementioned spring type can be a shape memory alloy, and the type of the spring can drive the piston to reset through temperature changes, achieving adaptive adjustment. The aforementioned graphene coating can be graphene material coated on the surface of the spring. The aforementioned graphene coating can be used to quickly transfer the heat generated by the ceramic heating element, accelerating the spring temperature response. The aforementioned ceramic heating element can be a heating element made of a positive temperature coefficient ceramic material, whose resistance increases with increasing temperature. The aforementioned ceramic heating element can control the spring temperature through controllable heating to achieve piston position control. The aforementioned fourth preset distance can be in the range of 3 to 5 mm. Here, the aforementioned fourth preset distance is not specifically limited and can be adjusted according to the actual situation. In operation, when the compressor is running, gas enters the pressure guide hole through the aforementioned suction slot, pushing the first-stage piston to the right. The first-stage piston then drives the second-stage piston to the right, compressing the spring. When the pressure within the sealed pressure chamber reaches a set value, the ceramic heating element is energized and heats up. The spring expands due to the heat, pushing the second-stage piston to the left, which in turn pushes the first-stage piston to the left, closing the pressure guide hole. When the pressure decreases, the ceramic heating element stops heating, the spring cools and contracts, and the first-stage piston moves to the right, reopening the pressure guide hole and restoring the suction function of the sealed pressure chamber. The specific value of the aforementioned set value is not limited and can be adjusted according to actual needs. For example, the set value can be 83000 Pa.

[0053] The above-described technical solution, as an inventive point of this disclosure, solves technical problem two: traditional fixed-size suction slots are difficult to adapt to the variable operating conditions of compressors. Under different operating conditions, fixed-size suction slots can lead to a decrease in blade aerodynamic performance or an increase in total pressure loss. The reasons for the decrease in blade aerodynamic performance or the increase in total pressure loss are as follows: In the scenario of high-load compressor design verification, traditional fixed-size suction slots are difficult to adapt to the variable operating conditions of compressors. Under low angle of attack or low flow rate conditions, suction slots that are too large will draw in too much mainstream fluid, resulting in a decrease in blade aerodynamic performance. Under high angle of attack or stall conditions, suction slots that are too small cannot effectively suppress separation, resulting in an increase in total pressure loss and poor suction effect. To achieve this effect, the suction device disclosed herein includes a sealed pressure chamber located behind the aforementioned suction slit groove. A pressure guiding hole is provided on the front wall of the sealed pressure chamber. A primary piston and a secondary piston are provided within the sealed pressure chamber, rigidly connected. A spring is connected to the right end face of the secondary piston. The spring is made of shape memory alloy and coated with a graphene layer. A removable ceramic heating element is embedded in the side wall of the sealed pressure chamber. Thus, the pressure guiding hole can capture the dynamic static pressure value within the blade channel in real time. When the pressure remains high, the ceramic heating element is energized, the graphene coating accelerates heat conduction, the shape memory alloy spring heats up, the piston moves to the right, and the suction slit groove increases in opening. This allows for automatic adjustment of the suction slit groove opening, reducing the decrease in aerodynamic performance of the blades or the increase in total pressure loss.

[0054] In the process of adopting technical solutions to address the aforementioned technical problems, the following technical problem three often arises: In scenarios where the suction device simulates aircraft takeoff and climb, the airflow impacts the blades at a large angle of attack, easily leading to severe airflow separation on the suction surface of the blades. This results in boundary layer thickening and the generation of large vortices in the separation zone. Furthermore, when operating conditions change and the angle of attack decreases, the suction capacity of the suction device weakens, causing backflow. The conventional solution to this technical problem three is generally to optimize the blade profile. However, considering the shortcomings of optimizing the blade profile and leveraging the advantages of our company in developing suction devices for the boundary layer of compressor blade tests, we have decided to adopt the following solution:

[0055] Optionally, a flexible valve is provided on the upstream side of the aforementioned suction slit groove. One end of the flexible valve is a fixed end, which is fixed to the aforementioned grid plate. The other end of the flexible valve is a free end, which is perpendicular to the surface of the aforementioned grid plate. The flexible valve is used to bend inward towards the suction slit groove in response to a change in the pressure difference between the gas in the suction slit groove and the gas in the aforementioned gas channel, thereby forming an angle between the flexible valve and the surface of the aforementioned grid plate. The upstream side of the suction slit groove can characterize the side where the airflow enters the suction slit groove. The flexible valve can be a metal foil with good elasticity and fatigue resistance. For example, the metal foil can be 301 stainless steel. The fixed end of the flexible valve can be fixed to the aforementioned grid plate using micro-screws. In a natural, pressure-free initial state, the free end of the flexible valve is perpendicular to the upper surface of the aforementioned grid plate, forming a baffle adjacent to the aforementioned suction slit groove. In practice, when the aforementioned vacuum pump operates, a low pressure is formed downstream of the aforementioned suction slot, while a high pressure is formed in the gas channel between the blades. When the angle of attack is greater than the target angle of attack, the pressure difference between the gas pressure in the aforementioned suction slot and the pressure in the gas channel between the blades increases. The free end of the aforementioned flexible valve bends inward towards the suction slot to form a smooth angle. This angle guides the low-energy airflow of the boundary layer smoothly into the aforementioned suction slot, reducing airflow separation at the corner of the suction slot inlet, thereby reducing the generation of large vortices in the separation zone. When the angle of attack is less than the target angle of attack, the pressure difference between the gas pressure in the aforementioned suction slot and the pressure in the gas channel between the blades decreases. The free end of the aforementioned flexible valve will rebound, reducing the angle, thus further blocking backflow of airflow when the suction capacity weakens. Here, the specific value of the aforementioned target angle of attack is not limited; for example, the target angle of attack can be +5°.

[0056] The above-described technical solution, as an inventive point of this disclosure, solves technical problem three: the situation where airflow impacts the blades at a large angle of attack, leading to thickening of the airflow boundary layer and the generation of large vortices in the airflow separation zone; and the situation where, when operating conditions change and the angle of attack decreases, the suction capacity of the suction device weakens, causing airflow backflow. The reasons for the airflow impacting the blades at different angles of attack, resulting in large vortices in the airflow separation zone or airflow backflow, are as follows: In scenarios simulating aircraft takeoff and climb, the airflow impacting the blades at a large angle of attack easily causes severe airflow separation on the blade's suction surface, leading to boundary layer thickening and the generation of large vortices in the separation zone. Furthermore, when operating conditions change and the angle of attack decreases, the suction capacity of the suction device weakens, causing airflow backflow. To achieve this effect, the flexible valve of the suction device disclosed herein can form an angle that guides the airflow into the suction slot based on the pressure difference between the gas passage between the blades and the suction slot. When the angle of attack is greater than the target angle of attack, the free end of the flexible valve bends inward toward the suction slot to form a smooth angle. This angle can guide the low-energy airflow of the boundary layer smoothly into the suction slot, thus reducing the separation of airflow at the inlet corner of the suction slot, which leads to boundary layer thickening and the generation of large vortices in the separation zone. Also, when the angle of attack is less than the target angle of attack, the free end of the flexible valve will rebound inward, reducing the angle, thereby further preventing backflow of airflow when the suction capacity of the suction device weakens.

[0057] In the process of adopting technical solutions to address the aforementioned technical problems, the following technical problem four often arises: In scenarios involving design verification under varying operating conditions, the linear control strategy employed by traditional suction devices cannot adapt to sudden changes in operating conditions, leading to control instability and inaccurate experimental data; because the test conditions need to be dynamically adjusted during the experiment, the speed of manual flow adjustment cannot keep up with the rate of change in operating conditions, resulting in a limited test range; due to the inability to sense the wear state of the blades, the system continuously applies standard suction intensity to the wear zone, leading to increased fluctuations in suction flow and increased flow control deviation. Regarding the aforementioned technical problem three, conventional solutions generally rely on human experience, manually adjusting the valve opening according to changes in operating conditions. However, considering the shortcomings of manually adjusting the valve opening according to changes in operating conditions, and combining the advantages of the inventor's company in developing suction devices applied to the boundary layer of compressor blade tests, we decided to adopt the following solution:

[0058] Optionally, the suction device further includes an ultraviolet light-emitting diode (UV LED), a spectrometer, an angle-of-attack sensor, a pressure sensor assembly, and a processor. Each blade in the blade assembly is coated with a fluorescent coating. The angle-of-attack sensor can be a five-hole pressure probe, embedded at the leading edge of the blade, with the distance from the blade's leading edge along the blade's chord length being 1.5 times the blade's chord length. The UV LED is positioned along the length of the grid plate in the region directly opposite the blade's suction surface at the top edge of the grid plate. The UV LED is configured to operate in a pulsed manner, with its pulse frequency synchronized with the spectrometer's sampling frequency. The pressure sensor assembly can consist of five units. All pressure sensors can be piezoresistive pressure sensors, embedded at 5mm intervals along the chord length of the suction surface, with the probe tips flush with the blade's profile. The processor can be an instrument for processing various information, such as a central processing unit (CPU). The processor can communicate with the angle-of-attack sensor, the pressure sensor, the flow meter, and the regulating valve. It should be noted that the aforementioned communication connections may include, but are not limited to, 3G / 4G connections, WiFi connections, Bluetooth connections, WiMAX connections, Zigbee connections, UWB (ultra-wideband) connections, and other currently known or future-developed communication methods. The fluorescent coating material may be a high-temperature resistant paint doped with rare-earth fluorescent materials, and this material can maintain fluorescence stability under high-temperature environments. The wavelength range of the aforementioned ultraviolet light-emitting diode may be 360–370 nm, and the wavelength range of the ultraviolet light-emitting diode has a high degree of matching with the material of the aforementioned fluorescent coating. The spectrometer may be a fluorescence spectrometer. The spectrometer may be integrated into the top edge of the aforementioned grid plate, near the leading edge of the aforementioned blade.

[0059] The processor described above is further configured to perform the following steps:

[0060] The first step, in response to determining that the vacuum pump is in the start-up state, is to receive the angle of attack information collected by the angle of attack sensor, the suction surface pressure distribution information acquired by the pressure sensor group, and the fluorescence intensity information collected by the spectrometer. The angle of attack information characterizes the angle between the incoming flow direction of the airflow in each gas channel, measured in real time by the five-hole pressure probe, and the chord line of any blade on either side of the gas channel. The suction surface pressure distribution information characterizes the pressure value of the suction surface of each blade in the blade group. The fluorescence intensity information in the fluorescence intensity information set characterizes the brightness value of the fluorescence emitted by the fluorescent coating when the surface of each blade in the blade group is irradiated by the ultraviolet light-emitting diode within a preset time period. The start-up state indicates that the vacuum pump has been started. The specific value of the preset time period is not limited; for example, the preset time period can be May 1st to May 3rd.

[0061] The second step is to determine the pressure gradient information based on the aforementioned angle-of-attack information and the suction surface pressure distribution information. This pressure gradient information characterizes the rate of change of pressure value on the suction surface of each blade within the blade group. In practice, the processor can determine the pressure gradient information using a forward difference formula and a correction formula, based on the angle-of-attack information and the suction surface pressure distribution information.

[0062] The third step involves determining the degradation coefficient information of the corresponding fluorescent coating based on the aforementioned fluorescence intensity information set and the pre-trained degradation coefficient model. This degradation coefficient information characterizes the decay rate of the fluorescence lifetime of the fluorescent coating relative to an initially set fluorescence lifetime. The specific value of the initially set fluorescence lifetime is not limited. For example, the fluorescence lifetime could be 8.5 ns. The decay rate could be 50%. In practice, firstly, the processor can acquire the time series of the fluorescence intensity information set, the environmental factors of the fluorescent coating, and the physical properties of the fluorescent coating using the spectrometer. Then, the acquired time series, the environmental factors of the fluorescent coating, and the physical properties of the fluorescent coating are input into the pre-trained degradation coefficient model to obtain the degradation coefficient information. The environmental factors of the fluorescent coating can be the irradiance of the ultraviolet light emitted by the ultraviolet light-emitting diode. The physical properties of the fluorescent coating can characterize the thickness of the fluorescent coating. The time series can characterize each time point within the preset time period when the spectrometer acquires the fluorescence intensity information set. For example, if the preset time period is May 1st to May 3rd, then the time series could include 6 PM on May 1st, 6 PM on May 2nd, and 6 PM on May 3rd, with a 24-hour interval between any two adjacent time points. The time points in the time series can correspond one-to-one with the fluorescence intensity information in the fluorescence intensity information set. The pre-trained degradation coefficient model can be a model that takes the time series of fluorescence intensity information obtained from the spectrometer, the environmental factors of the fluorescent coating, and the physical properties of the fluorescent coating as input, and the degradation coefficient information as output. The pre-trained degradation coefficient model can be a gradient boosting decision tree model. The training method for the gradient boosting decision tree model can be batch training. For example, the gradient boosting decision tree model could be LightGBM.

[0063] The fourth step involves determining the multimodal flow field characteristics of the corresponding flow field based on the aforementioned angle of attack information, suction surface pressure distribution information, and degradation coefficient information. These multimodal flow field characteristics can characterize the feature vectors of the flow field within the suction device. For example, the multimodal flow field characteristics can characterize a 16-dimensional feature vector. In practice, the processor can input the aforementioned angle of attack information, suction surface pressure distribution information, and fluorescence intensity information set into a fully connected autoencoder to obtain the corresponding feature vectors as multimodal flow field characteristics.

[0064] The fifth step involves determining the key flow rate information based on the aforementioned pressure gradient information, degradation coefficient information, and multimodal flow field characteristics. This key flow rate information characterizes the suction flow rate that the suction device needs to maintain under the current operating conditions. In practice, the processor can input the aforementioned pressure gradient information, degradation coefficient information, and multimodal flow field characteristics into the XGBoost regression model to obtain the key flow rate information.

[0065] Step 6: Based on the aforementioned key flow rate information, angle of attack information, pressure gradient information, and degradation coefficient information, determine the nonlinear mapping function. In practice, the executing entity can input the aforementioned key flow rate information, angle of attack information, pressure gradient information, and degradation coefficient information into the aforementioned XGBoost regression model to obtain the nonlinear mapping function.

[0066] Step 7: Determine the target flow rate information based on the aforementioned nonlinear mapping function. This target flow rate information represents the predicted flow rate that the suction device needs to pump at the current moment. In practice, firstly, the processor can determine the target mapping information as representing the key flow rate information, angle of attack information, pressure gradient information, and degradation coefficient information. Then, based on the target mapping information, the target flow rate information is obtained using the aforementioned nonlinear mapping function. This nonlinear mapping function represents a piecewise nonlinear function between the target flow rate information and the target mapping information.

[0067] Step 8: Based on the aforementioned target flow rate information, control the regulating valve to adjust the flow rate. In practice, firstly, the processor can determine the preset adjustment angle information corresponding to the target flow rate information from a preset adjustment angle information set. The preset adjustment angle information in the preset adjustment angle information set represents the correspondence between the adjustment angle of the regulating valve and the target flow rate information. For example, the preset adjustment angle information could be: "Target flow rate: 20 g / s, regulating valve adjustment angle: 60 degrees". Then, the adjustment angle of the regulating valve in the determined preset adjustment angle information is set as the rotation angle of the regulating valve. Finally, based on the rotation angle, control the regulating valve to adjust the flow rate.

[0068] The above-described technical solution, as an inventive point of this disclosure, solves technical problem four: the linear control strategy used in traditional suction devices causes inaccurate experimental data due to control instability; the experimental range is limited because the speed of manually adjusting the flow rate cannot keep up with the rate of change in operating conditions; and the flow control deviation increases because the system continuously applies standard suction intensity to the wear zone. The reasons for inaccurate experimental data, limited experimental range, and increased flow control deviation are as follows: in the scenario of design verification under varying operating conditions, the linear control strategy used in traditional suction devices cannot adapt to sudden changes in operating conditions, resulting in inaccurate experimental data due to control instability; the experimental range is limited because the experimental conditions need to be dynamically adjusted, and the speed of manually adjusting the flow rate cannot keep up with the rate of change in operating conditions; and the system continuously applies standard suction intensity to the wear zone because it cannot sense the wear state of the blades, leading to increased fluctuations in the suction flow rate and increased flow control deviation. To achieve this effect, the suction device of this disclosure determines the target flow rate information based on the angle of attack information collected by the angle of attack sensor, the suction surface pressure distribution information obtained by the pressure sensor group, and the fluorescence intensity information collected by the spectrometer, according to the nonlinear mapping function. Therefore, the aforementioned suction device can employ a nonlinear control strategy to reduce inaccuracies in the experimental data of the suction test. Furthermore, based on the angle-of-attack information collected by the angle-of-attack sensor, the pressure distribution information of the suction surface obtained by the pressure sensor group, and the fluorescence intensity information collected by the spectrometer, key flow information can be determined according to the pressure gradient information, degradation coefficient information, and multimodal flow field characteristics. This allows for dynamic adjustment of the suction flow rate, reducing the limitation of the experimental range caused by manual flow adjustment failing to keep pace with changes in operating conditions. Also, since the suction device includes an ultraviolet light-emitting diode, a spectrometer, an angle-of-attack sensor, a pressure sensor group, and a processor, and each blade in the blade group is coated with a fluorescent coating, the flow rate can be adjusted by controlling the regulating valve based on the target flow rate information. The degradation coefficient information of the corresponding fluorescent coating can be determined based on the fluorescence intensity information and a pre-trained degradation coefficient model. This allows for the perception of the blade coating state, reducing the standard suction intensity continuously applied to the wear zone and minimizing the risk of high-speed airflow accelerating the shedding of debris from the blade surface, which could lead to increased suction flow fluctuations and flow control deviations.

[0069] The above-described embodiments of this disclosure have the following beneficial effects: the suction device applied to the boundary layer of compressor blade test according to some embodiments of this disclosure can reduce the difficulty of adjusting the boundary layer suction position, reduce the complexity of the test bench structure, manufacturing cost and test maintenance difficulty, improve the aerodynamic performance of the blade, thereby reducing the occurrence of poor test data and reducing the energy consumption during the operation of the suction equipment. The existing technologies suffer from difficulties in adjusting the boundary layer suction position, complex test bench structures, high manufacturing costs and maintenance difficulties, and low blade aerodynamic performance, resulting in poor experimental data and high energy consumption during suction equipment operation. These issues arise because traditional suction devices are integrally welded to the test bench, making it impossible to disassemble the grid plates according to different blade geometry or experimental requirements. This makes adjusting the suction slot difficult, thus increasing experimental complexity. Furthermore, the additionally designed small holes, gaps, vacuum chambers, and pipelines are easily clogged by particles, increasing the maintenance difficulty of the test bench and raising its manufacturing cost. When facing high suction flow requirements, many suction holes are in ineffective suction positions, leading to low experimental data accuracy, poor suction performance, and excessive energy consumption during operation. Based on this, some embodiments of the present disclosure describe a suction device applied to the boundary layer of a compressor blade cascade test. The suction device comprises a suction position adjustment structure group, a suction flow control component, and a blade group. Each side of the blade group is connected to a suction position adjustment structure in the suction position adjustment structure group. Each suction position adjustment structure in the suction position adjustment structure group includes a grid plate, a suction hood, a suction conduit group, and a gas collecting tank suction conduit. The grid plate has a blade mounting groove group and a suction slot groove group. The positions of the groups are variable, and the number of the blade mounting slot groups and the suction slot groups are the same. The grid plate, the suction hood, the suction conduit group, and the gas collecting tank suction conduit are all detachable. The suction hood has a sealed chamber inside, and a flow stabilizing plate is provided at a preset height in the sealed chamber. The flow stabilizing plate has a preset number of through holes for dispersing the airflow. The suction flow control component includes a manifold, a flow meter, a regulating valve, and a vacuum suction pump. The suction flow control component is used to control the suction flow of the suction device. Because each suction position adjustment structure in the above-mentioned suction position adjustment structure group includes a grid plate, and the grid plate has a blade mounting groove group and a suction slit groove group, and since the grid plate, the suction hood, the suction conduit group and the gas collecting tank suction conduit are all detachable, the position of the suction slit groove group is variable. Therefore, the opening position of the suction slit groove can be adjusted by replacing the grid plate, reducing the difficulty of adjusting the suction slit groove and thus reducing the difficulty of experimental operation. The position of the suction slit groove can be adjusted, thereby improving the accuracy of experimental data, improving the suction effect, and reducing the energy consumption of the suction equipment during operation.Furthermore, since the aforementioned suction flow control assembly includes a manifold, flow meter, regulating valve, and vacuum suction pump, and is used to control the suction flow of the aforementioned suction device, different suction flow rates can be allocated at different suction positions, reducing excessive energy consumption during the operation of the suction equipment unit. Also, because each suction position adjustment structure in the aforementioned suction position adjustment structure group, including the grid plate, suction hood, suction conduit assembly, and gas collection tank suction conduit, is detachable, the difficulty of test maintenance can be reduced, and it can be flexibly used on different test benches. It is not necessary to have a suction device fixedly connected to each test bench, reducing the number of required suction devices and lowering the manufacturing cost of the test benches.

[0070] The following is for reference. Figure 6 It shows a schematic diagram of the structure of an electronic device 600 (e.g., a computing device) suitable for implementing some embodiments of the present disclosure. Figure 6 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of this disclosure.

[0071] like Figure 6 As shown, electronic device 600 may include processing unit 601 (e.g., central processing unit, graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 602 or a program loaded from storage device 608 into random access memory (RAM) 603. RAM 603 also stores various programs and data required for the operation of electronic device 600. Processing unit 601, ROM 602, and RAM 603 are interconnected via bus 604. Input / output (I / O) interface 605 is also connected to bus 604.

[0072] Typically, the following devices can be connected to I / O interface 605: input devices 606 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 607 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 608 including, for example, magnetic tapes, hard disks, etc.; and communication devices 609. Communication device 609 allows electronic device 600 to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 6 An electronic device 600 with various devices is shown; however, it should be understood that it is not required to implement or possess all of the devices shown. More or fewer devices may be implemented or possessed alternatively. Figure 6 Each box shown can represent a device or multiple devices as needed.

[0073] In particular, according to some embodiments of this disclosure, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, some embodiments of this disclosure include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 609, or installed from a storage device 608, or installed from a ROM 602. When the computer program is executed by the processing device 601, it performs the functions defined above in the methods of some embodiments of this disclosure.

[0074] It should be noted that, in some embodiments of this disclosure, the computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium may be, for example,—but not limited to—an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In some embodiments of this disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In some embodiments of this disclosure, a computer-readable signal medium may include a data signal propagated in baseband or as part of a carrier wave, carrying computer-readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium can be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to: wires, optical fibers, RF (radio frequency), etc., or any suitable combination thereof.

[0075] In some implementations, clients and servers can communicate using any currently known or future-developed network protocol such as HTTP (Hypertext Transfer Protocol) and can interconnect with digital data communication (e.g., communication networks) of any form or medium. Examples of communication networks include local area networks (“LANs”), wide area networks (“WANs”), the Internet (e.g., the Internet of Things), and peer-to-peer networks (e.g., ad hoc peer-to-peer networks), as well as any currently known or future-developed networks.

[0076] The aforementioned computer-readable medium may be included in the aforementioned electronic device; or it may exist independently and not assembled into the electronic device. The aforementioned computer-readable medium carries one or more programs. When the aforementioned one or more programs are executed by the electronic device, the electronic device causes the following actions in response to determining that the vacuum pump is in a start-up state: receiving angle-of-attack information collected by the angle-of-attack sensor, suction surface pressure distribution information collected by the pressure sensor group, and fluorescence intensity information collected by the spectrometer; determining pressure gradient information based on the angle-of-attack information and the suction surface pressure distribution information; determining the degradation coefficient information of the corresponding fluorescent coating based on the fluorescence intensity information set and a pre-trained degradation coefficient model; determining multimodal flow field characteristics of the corresponding flow field based on the angle-of-attack information, the suction surface pressure distribution information, and the degradation coefficient information; determining key flow rate information based on the pressure gradient information, the degradation coefficient information, and the multimodal flow field characteristics; determining a nonlinear mapping function based on the key flow rate information, the angle-of-attack information, the pressure gradient information, and the degradation coefficient information; determining target flow rate information based on the nonlinear mapping function; and controlling the regulating valve to adjust the flow rate based on the target flow rate information.

[0077] Computer program code for performing operations of some embodiments of this disclosure can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0078] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0079] The functions described above in this document can be performed, at least in part, by one or more hardware logic components. For example, exemplary types of hardware logic components that can be used, without limitation, include: Field Programmable Gate Arrays (FPGAs), Application-Specific Integrated Circuits (ASICs), Application Standard Products (ASSPs), System-on-Chip (SoCs), Complex Programmable Logic Devices (CPLDs), and so on.

[0080] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A suction device for the boundary layer in compressor blade cascade testing, characterized in that, The suction device includes a suction position adjustment structure assembly, a suction flow control component, and a blade assembly, wherein... Each side of the blade assembly is connected to a suction position adjustment structure in the suction position adjustment structure assembly. Each suction position adjustment structure in the suction position adjustment structure group includes a grid plate, a suction hood, a suction conduit group, and a gas collection tank suction conduit. The grid plate has a blade mounting groove group and a suction slot group. The position of the suction slot group is variable. The number of blade mounting groove groups and suction slot groups is the same. The grid plate, the suction hood, the suction conduit group, and the gas collection tank suction conduit are all detachable. The suction hood has a sealed chamber inside, and a flow stabilizing plate is provided at a preset height in the sealed chamber. The flow stabilizing plate has a first preset number of through holes, which are used to disperse the airflow. The suction flow control component includes a manifold, a flow meter, a regulating valve, and a vacuum pump. The suction flow control component is used to control the suction flow of the suction device. The suction device also includes a gas collection tank. One side of the grid plate is connected to one side of the blade assembly, the other side of the grid plate is connected to one side of the suction hood, the other side of the suction hood is connected to one end of the suction conduit assembly, the other end of the suction conduit assembly is connected to one side of the gas collection tank, and the other side of the gas collection tank is connected to one end of the gas collection tank suction conduit. The other end of the gas collecting tank suction pipe is connected to the manifold. The manifold is connected to the vacuum suction pump through a flow-adjustable pipe. The flow-adjustable pipe is equipped with a flow meter and a regulating valve. The flow meter is adjacent to the manifold, and the regulating valve is adjacent to the vacuum suction pump. The suction slot group and the blade mounting slot group are equally spaced on the grid plate. One side of the blade group is embedded in the blade mounting slot group. Each blade in the blade group includes a suction surface and a pressure surface. The suction surface is the convex surface of the blade, and the pressure surface is the concave surface of the blade. Each suction slot in the suction slot group has adjacent blades on its left and right sides. The distance between the suction slot and the pressure surface of the adjacent blade on the left is a first preset distance, and the distance between the suction slot and the suction surface of the adjacent blade on the right is a second preset distance. The second preset distance is greater than the first preset distance. The shape of the suction slot is the same as the shape of the suction surface profile of the suction surface.

2. The suction device for the boundary layer of a compressor blade test according to claim 1, characterized in that, The gas collecting tank is provided with a second preset number of pneumatic connectors on the side connected to the suction conduit assembly. The second preset number of pneumatic connectors are used to connect the gas collecting tank and the suction conduit assembly. In use, the suction conduit assembly is used to guide the gas drawn from the suction slot group from the suction hood to the gas collecting tank.

3. The suction device for the boundary layer of a compressor blade test according to claim 1, characterized in that, A flange is provided at the connection between the gas collecting tank and the gas collecting tank suction conduit. The gas collecting tank is used to collect the gas flow from the grouped flow in the suction conduit. The gas collecting tank suction conduit is used to transport the pressure-equalized gas flow in the gas collecting tank to the manifold. The flange is used to connect the gas collecting tank and the gas collecting tank suction conduit.

4. The suction device for the boundary layer of a compressor blade test according to claim 1, characterized in that, The grid plate, the suction hood, the suction conduit assembly, and the gas collection tank suction conduit are used to adjust the suction position and suction flow rate of the suction device.

5. The suction device for the boundary layer of a compressor blade test according to claim 1, characterized in that, The outer wall of the suction shroud is provided with a second preset number of threaded holes. The second preset number of threaded holes are connected to one end of a second preset number of quick-connect fittings. The other end of the second preset number of quick-connect fittings is connected to one end of the suction conduit assembly. The suction conduit assembly includes a second preset number of suction conduits.

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