Cascade inlet flow field adjusting device applied to compressor

Abstract

The embodiment of the present disclosure discloses a cascade inlet flow field adjusting device applied to a compressor, which comprises an end wall, a support positioning plate, a brass graphite shaft sleeve, an adjusting device, the end wall comprises an upper arc-shaped end wall and a lower arc-shaped end wall; the adjusting device comprises the brass graphite shaft sleeve, a combined blade, a leading edge connecting rod, a leading edge driving shaft, a trailing edge connecting rod and a trailing edge driving shaft; the driving device comprises a leading edge driving ring and a trailing edge driving ring; the combined blade comprises a leading edge blade and a trailing edge blade, the trailing edge driving ring adjusts the angle of the trailing edge blade, and the leading edge driving ring adjusts the angle of the leading edge blade; the gap between the end wall mounting hole and the brass graphite shaft sleeve meets the preset gap mounting condition, and the driving shaft is provided with an elastic sealing ring in contact with the brass graphite shaft sleeve. The embodiment can reduce the angle deviation of blade rotation adjustment, reduce the leakage flow caused by the gap, and avoid the situation of destroying the simulation reality, thereby improving the experimental effect.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of compressor blade cascade testing applications, specifically to a compressor blade cascade inlet flow field adjustment device. Background Technology

[0002] In aerodynamic experimental research, blade cascade testing is an important experimental method, mainly used to test the aerodynamic performance of turbine blades. It involves replacing a complete annular blade cascade with a partial blade cascade, simulating a real flow environment in a wind tunnel or aerodynamic test rig. Currently, adjustable guide vanes are frequently used in constructing simulated flow environments to accommodate different angles of attack. These adjustable guide vanes typically employ a traditional single-blade structure, rotating as a whole via a rotating shaft.

[0003] However, in practice, the following technical problems often arise when using adjustable guide vanes:

[0004] When the angle changes significantly, a large gap needs to be reserved between the adjustable guide vane and the endwall to reduce friction between the adjustable guide vane and the endwall during rotation. This can lead to increased flow leakage due to gap, resulting in non-physical abrupt changes in the flow field, which undermines the simulation's realism and leads to poor experimental results. Since the adjustable guide vane is adjusted by rotating as a whole using a single-piece structure and a rotating shaft, the angle of the entire adjustable guide vane needs to be adjusted. This results in a large deviation in the angle of overall rotation adjustment, leading to poor experimental results and requiring repeated adjustments to the experimental angle of attack. The experimental procedures are cumbersome and time-consuming.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background of the inventive 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 flow field adjustment device for the inlet of a compressor blade cascade to solve one or more of the technical problems mentioned in the background section above.

[0008] In a first aspect, some embodiments of this disclosure provide a flow field adjustment device for the inlet of a compressor blade cascade, characterized in that the flow field adjustment device includes an end wall, a support and positioning plate, a driving device, and a predetermined number of adjustment devices, wherein the end wall includes an upper arc-shaped end wall and a lower arc-shaped end wall, and the support and positioning plate is connected to the left and right sides of the end wall; each of the predetermined number of adjustment devices includes a combined blade, a leading edge connecting rod, a leading edge drive shaft, a trailing edge connecting rod, and a trailing edge drive shaft; the driving device includes a leading edge drive ring and a trailing edge drive ring; the combined blade includes a leading edge blade and a trailing edge blade. The aforementioned trailing edge drive ring adjusts the angle of the trailing edge blade via the aforementioned trailing edge drive shaft and the aforementioned trailing edge connecting rod. The aforementioned leading edge drive ring adjusts the angle of the aforementioned leading edge blade via the aforementioned leading edge drive shaft and the aforementioned leading edge connecting rod. Both the aforementioned upper arc-shaped end wall and the aforementioned lower arc-shaped end wall are provided with end wall mounting holes. Brass graphite bushings are provided in the provided end wall mounting holes. The gap between the aforementioned end wall mounting holes and the aforementioned brass graphite bushings meets the preset gap installation conditions. The aforementioned adjusting device includes an elastic sealing ring in the middle of both the trailing edge drive shaft and the leading edge drive shaft. The provided elastic sealing rings are in contact with the brass graphite bushings in the end wall mounting holes.

[0009] Optionally, the upper arc-shaped end wall, the lower arc-shaped end wall, the support positioning plate connected to the left side of the end wall, and the support positioning plate connected to the right side of the end wall form a closed flow channel.

[0010] Optionally, the trailing edge drive ring is mounted on the top of the upper arcuate end wall, and the leading edge drive ring is mounted on the bottom of the lower arcuate end wall.

[0011] Optionally, both the trailing edge drive shaft and the leading edge drive shaft are provided with mounting grooves, and elastic sealing rings are installed in the mounting grooves. The elastic sealing rings are in extrusion contact with the brass graphite bushing in the mounting hole of the end wall. The trailing edge drive shaft and the brass graphite bushing in the mounting hole of the end wall, as well as the leading edge drive shaft and the brass graphite bushing in the mounting hole of the end wall, are in sealed contact.

[0012] Optionally, the trailing edge drive shaft and the leading edge drive shaft are collinear in vertical space to form a central axis, and one side of the trailing edge blade is offset from the central axis by a range of 0.1 to 0.5 mm.

[0013] Optionally, the shaft body located in the closed flow channel after the trailing edge drive shaft passes through the upper arc-shaped end wall is the first fixed shaft body, and the shaft body protruding after the first fixed shaft body passes through the fixing hole of the trailing edge blade is the first limiting shaft body. The first limiting shaft body is inserted into the limiting hole of the leading edge blade, and the middle part of the trailing edge drive shaft is embedded in the brass graphite bushing in the upper arc-shaped end wall.

[0014] Optionally, the shaft of the aforementioned trailing edge drive shaft located outside the aforementioned closed flow channel is connected to one end of the aforementioned trailing edge connecting rod, and the other end of the aforementioned trailing edge connecting rod is connected to the aforementioned trailing edge drive ring. Any of the aforementioned preset number of adjusting devices has a trailing edge drive shaft connected to one end of the trailing edge connecting rod and then connected to a trailing edge angle disc.

[0015] Optionally, the shaft body located in the closed flow channel after the leading edge drive shaft passes through the lower arc-shaped end wall is the second fixed shaft body, the shaft body protruding after the second fixed shaft body passes through the limiting hole of the trailing edge blade is the second limiting shaft body, the second limiting shaft body passes into the fixing hole of the leading edge blade, and the middle part of the leading edge drive shaft is embedded in the brass graphite bushing in the lower arc-shaped end wall.

[0016] Optionally, the aforementioned leading edge drive shaft is located outside the aforementioned closed flow channel and is connected to one end of the aforementioned leading edge connecting rod, the other end of the aforementioned leading edge connecting rod is connected to the aforementioned leading edge drive ring, and any one of the aforementioned preset number of adjustment devices is connected to a leading edge angle plate after being connected to one end of the leading edge connecting rod.

[0017] Optionally, both the trailing edge drive ring and the leading edge drive ring are connected to a drive assembly. Both the trailing edge drive ring and the leading edge drive ring rotate circumferentially through the connected drive assembly. The circumferential rotation of the trailing edge drive ring can adjust the angle of each trailing edge blade in the preset number of adjustment devices. The circumferential rotation of the leading edge drive ring can adjust the angle of each leading edge blade in the preset number of adjustment devices. The leading edge drive ring can rotate each leading edge blade included in the preset number of adjustment devices to the same angle. The trailing edge drive ring can rotate each trailing edge blade included in the preset number of adjustment devices to the same angle. The angle of each leading edge blade included in the preset number of adjustment devices is the same as or different from the angle of each trailing edge blade included.

[0018] Optionally, the inner wall of each end wall mounting hole of the upper arc-shaped end wall and the lower arc-shaped end wall is semi-permanently fitted with a wear-resistant substrate; the wear-resistant substrate is a hardened steel bushing; the outer surface of the hardened steel bushing is connected to the end wall mounting hole by an interference fit; the brass graphite bushing is embedded in the wear-resistant substrate, and the gap between the wear-resistant substrate and the brass graphite bushing meets the target gap installation conditions; both the brass graphite bushing and the combined blade are detachable; adjustable mechanical blocks are installed at both ends of the circumferential rotation track of the trailing edge drive ring and the leading edge drive ring; the material of the installed adjustable mechanical blocks is hardened steel; the installed adjustable mechanical blocks are bolted to the reserved threaded holes of the upper arc-shaped end wall or bolted to the reserved threaded holes of the lower arc-shaped end wall; the contact surface of the installed adjustable mechanical blocks is embedded with a polytetrafluoroethylene gasket.

[0019] Optionally, the metal mesh cover is disposed at the air inlet end of the closed flow channel. The metal mesh cover is connected to the support positioning plate, upper arc-shaped end wall and lower arc-shaped end wall at the air inlet of the closed flow channel. The mesh aperture of the metal mesh cover is in the range of 0.5 to 1 mm, and is used to filter particles with a particle size greater than 0.5 mm in the airflow flowing into the closed flow channel. Both sides of the metal mesh cover are sprayed with a polyurethane coating containing microcapsules. The thickness of the polyurethane coating is in the range of 0.05 to 0.1 mm. The microcapsules are made of polyurea-formaldehyde shell material and encapsulate liquid polyurethane inside. The microcapsules are uniformly dispersed in the coating and have a particle size of 10 to 50 μm.

[0020] Optionally, a pressure sensor group is installed inside the aforementioned closed flow channel, and an angle sensor group, a drive ring controller group, a switchable permanent magnet locker group, an electromagnetic attractor group, a circuit breaker, and a processor are installed outside the aforementioned closed flow channel. The pressure sensor group, angle sensor group, drive ring controller group, switchable permanent magnet locker group, electromagnetic attractor group, circuit breaker, and processor are all communicatively connected, and the processor is further configured to perform the following detection steps: receiving pressure information of the aforementioned closed flow channel collected by the pressure sensor group, and receiving current angle information of the leading edge blade and the trailing edge blade collected by the angle sensor group; determining the flow state information of the aforementioned closed flow channel based on the pressure information. In this process, the aforementioned flow state characteristics include airflow velocity and airflow rate; based on the current angle information of the leading edge blade and the trailing edge blade, the current angular position information of the combined blade is determined; based on the current angular position information of the combined blade and the aforementioned flow state information, the target angle value of the combined blade is determined; in response to determining that the current angular position information differs from the target angle value, the switchable permanent magnet lock group is controlled to release the drive device, and based on the target angle value of the combined blade, the drive ring controller group is controlled to rotate the combined blade; in response to detecting a rotation end signal of the drive ring controller group, the switchable permanent magnet lock group is controlled to lock the drive device, and the aforementioned detection steps are executed again.

[0021] Secondly, 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 implementation of the first aspect above.

[0022] The various embodiments of this disclosure have the following beneficial effects: The flow field adjustment device applied to the compressor blade inlet of some embodiments of this disclosure can reduce the angular deviation of the overall rotation adjustment, thereby improving experimental results, reducing the need for repeated adjustments to the experimental angle of attack, shortening the time consumed, and reducing the occurrence of non-physical abrupt changes in the flow field caused by increased flow leakage, which could damage the simulation's realism, thus improving the accuracy of experimental data and enhancing experimental results. Specifically, the reason for the numerous technical problems of existing flow field adjustment devices applied to compressor blade inlets is that: when large angle changes occur, a large gap needs to be reserved between the adjustable guide vane and the end wall to reduce friction between the adjustable guide vane and the end wall during rotation, causing increased flow leakage and resulting in non-physical abrupt changes in the flow field, damaging the simulation's realism and leading to poor experimental results; since the adjustable guide vane is adjusted by rotating as a whole through a single-piece structure and a rotating shaft, the angle of the single-piece adjustable guide vane needs to be adjusted by overall rotation, resulting in a large angular deviation in the overall rotation adjustment, leading to poor experimental results, requiring repeated adjustments to the experimental angle of attack, making the experimental steps cumbersome and time-consuming. Based on this, some embodiments of this disclosure provide a flow field adjustment device for the inlet of a compressor blade cascade. The device comprises an end wall, a support and positioning plate, a drive device, and a predetermined number of adjustment devices. The end wall includes an upper arc-shaped end wall and a lower arc-shaped end wall, with the support and positioning plate connected to both the left and right sides of the end wall. Each of the predetermined number of adjustment devices includes a combined blade, a leading-edge connecting rod, a leading-edge drive shaft, a trailing-edge connecting rod, and a trailing-edge drive shaft. The drive device includes a leading-edge drive ring and a trailing-edge drive ring. The combined blade includes a leading-edge blade and a trailing-edge blade. The trailing edge drive ring adjusts the angle of the trailing edge blade via the trailing edge drive shaft and the trailing edge connecting rod. The leading edge drive ring adjusts the angle of the leading edge blade via the leading edge drive shaft and the leading edge connecting rod. Both the upper and lower arc-shaped end walls are provided with end wall mounting holes, and brass graphite bushings are installed in the end wall mounting holes. The gap between the end wall mounting holes and the brass graphite bushings meets the preset gap installation conditions. The middle of both the trailing edge drive shaft and the leading edge drive shaft included in the adjustment device is provided with elastic sealing rings, and the elastic sealing rings are in contact with the brass graphite bushings in the end wall mounting holes.Because the trailing edge drive ring can adjust the angle of the trailing edge blades via the trailing edge drive shaft and the trailing edge connecting rod, and the leading edge drive ring can adjust the angle of the leading edge blades via the leading edge drive shaft and the leading edge connecting rod, the trailing edge blades and the leading edge blades can rotate independently to change and adjust the angle of attack. This allows for small-scale adjustments to the angles of the trailing and leading edge blades to adjust the inflow angle of attack, rather than large-scale adjustments to the overall rotation angle of a single-piece adjustable guide vane. This reduces the overall rotation angle deviation and improves the flexibility of angle adjustment. Furthermore, because the leading and trailing edge blades are adjusted independently at small angles, the clearance between the blades and the endwall can be reduced during large angle changes. Also, because the clearance between the endwall mounting hole and the brass-graphite bushing meets the preset clearance installation conditions, which allow for a micro-clearance assembly between the endwall mounting hole and the brass-graphite bushing. Therefore, the smaller gaps between the blade and the endwall, as well as between the endwall mounting hole and the brass-graphite bushing, reduce the likelihood of non-physical abrupt changes in the flow field caused by increased flow due to gap leakage, which could compromise the simulation's realism. This improves the accuracy of experimental data and enhances experimental results. Furthermore, it reduces the overall rotation adjustment angle deviation, thereby improving experimental performance, reducing the need for repeated adjustments to the angle of attack, shortening the time required, and minimizing the risk of non-physical abrupt changes in the flow field caused by increased flow due to gap leakage, thus improving the accuracy of experimental data and enhancing experimental results. Attached Figure Description

[0023] 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.

[0024] Figure 1 This is a front structural schematic diagram of some embodiments of a compressor blade inlet flow field regulating device according to the present disclosure;

[0025] Figure 2 This is a side structural schematic diagram of some embodiments of the compressor blade inlet flow field adjustment device according to the present disclosure;

[0026] Figure 3 This is a schematic diagram of the assembly structure of the various combined blades included in the compressor blade inlet flow field adjustment device according to this disclosure;

[0027] Figure 4This is a schematic diagram of the combined blades included in the blade inlet flow field regulating device for a compressor according to the present disclosure;

[0028] Figure 5 This is a schematic diagram of the structure of an electronic device suitable for implementing some embodiments of the present disclosure. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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".

[0033] 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.

[0034] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Figure 1 This is a structural schematic diagram of some embodiments of a flow field adjustment device for a compressor blade inlet, based on the present disclosure. Figure 1 It may include an upper arc-shaped end wall 1, a lower arc-shaped end wall 2, a trailing edge blade 3, a leading edge blade 4, a trailing edge drive shaft 5, a leading edge drive shaft 6, a trailing edge drive ring 7, a leading edge drive ring 8, a trailing edge angle disc 9, a leading edge angle disc 10, a support positioning plate 11, a trailing edge connecting rod 12, and a leading edge connecting rod 13.

[0036] Figure 2 This is a side view structural schematic diagram of a flow field adjustment device for a compressor blade inlet, based on the present disclosure. Figure 2 It may include a trailing edge drive shaft 5, a trailing edge drive ring 7, a trailing edge angle disc 9, a trailing edge connecting rod 12, and a brass graphite bushing 14.

[0037] Figure 3 This is a schematic diagram of the assembly structure of the various combined blades included in the blade inlet flow field adjustment device for a compressor, based on the present disclosure. Figure 3 It may include trailing edge blade 3, leading edge blade 4, leading edge drive shaft 6, leading edge angle disk 10, and leading edge connecting rod 13.

[0038] Figure 4 This is a schematic diagram of the disassembled structure of the combined blades for a compressor inlet flow field regulation device, based on the present disclosure. Figure 4 It may include trailing edge blade 3, leading edge blade 4, trailing edge drive shaft 5, and leading edge drive shaft 6.

[0039] In some embodiments, such as Figure 1 and Figure 2 As shown, the aforementioned blade inlet flow field adjustment device may include an end wall, a support positioning plate 11, a brass graphite bushing 14, and a preset number of adjustment devices. The end wall and the support positioning plate 11 can both be made of 304 stainless steel. The end wall can be arc-shaped. Here, the materials and shapes of the end wall and support positioning plate 11 are not specifically limited and can be adjusted according to actual needs. The brass graphite bushing 14 is made of a brass matrix to provide strength and wear resistance. The graphite particles in the brass graphite bushing 14 are uniformly embedded in the brass matrix. The graphite particles have lubricating properties, giving the brass graphite bushing 14 self-lubricating properties, improving the flexibility of the drive shaft rotation, reducing gaps, and improving sealing.

[0040] In some embodiments, such as Figure 1 As shown, the aforementioned end wall may include an upper arc-shaped end wall 1 and a lower arc-shaped end wall 2. The aforementioned support positioning plate 11 can be connected to both the left and right sides of the aforementioned end wall. The connection method between the left and right sides of the aforementioned end wall and the aforementioned support positioning plate 11 can be welding or bolting. Here, the connection method between the left and right sides of the aforementioned end wall and the aforementioned support positioning plate 11 is not specifically limited and can be adjusted according to actual needs.

[0041] In some embodiments, such as Figure 1As shown, each of the aforementioned preset number of adjusting devices may include a combined blade, a leading-edge connecting rod 13, a leading-edge drive shaft 6, a trailing-edge connecting rod 12, and a trailing-edge drive shaft 5. The combined blade, leading-edge connecting rod 13, leading-edge drive shaft 6, trailing-edge connecting rod 12, and trailing-edge drive shaft 5 may all be made of 304 stainless steel. The materials of these components are not specifically limited and can be adjusted according to actual needs. The preset number may be 13. The specific value of this preset number is not specifically limited and can be adjusted according to actual needs.

[0042] In some embodiments, such as Figure 2 As shown, the aforementioned driving device may include the leading edge driving ring 8 and the trailing edge driving ring 7. Both the leading edge driving ring 8 and the trailing edge driving ring 7 can be arc-shaped, and both can be made of 304 stainless steel. Here, the shape and material of the leading edge driving ring 8 and the trailing edge driving ring 7 are not specifically limited and can be adjusted according to actual needs.

[0043] In some embodiments, such as Figure 4 As shown, the aforementioned combined blade may include a leading-edge blade 4 and a trailing-edge blade 3. The trailing-edge drive ring 7 can adjust the angle of the trailing-edge blade 3 via the trailing-edge drive shaft 5 and the trailing-edge connecting rod 12. The leading-edge drive ring 8 can adjust the angle of the leading-edge blade 4 via the leading-edge drive shaft 6 and the leading-edge connecting rod 13. The connection between the trailing-edge connecting rod 12 and the trailing-edge drive ring 7, and between the leading-edge connecting rod 13 and the leading-edge drive ring 8, can both be achieved using bolt connections. The trailing-edge drive shaft 5 can be embedded in one end of the trailing-edge connecting rod 12, and the leading-edge drive shaft 6 can be embedded in one end of the leading-edge connecting rod 13. The specific connection methods between the trailing-edge connecting rod 12 and the trailing-edge drive ring 7, the leading-edge connecting rod 13 and the leading-edge drive ring 8, the trailing-edge connecting rod 12 and the trailing-edge drive shaft 5, and the leading-edge connecting rod 13 and the leading-edge drive shaft 6 are not specifically limited and can be adjusted according to actual needs. The trailing edge blade 3 can be an arc-shaped thin plate with connecting lugs. Its shape can adapt to changes in the inlet flow angle of attack, contributing to the construction of the inlet flow field. The leading edge blade 4 can be a coaxially nested semi-cylinder. Its shape can adjust the outlet airflow angle and throat area, thus optimizing flow field quality. Here, the shapes of both the trailing edge blade 3 and the leading edge blade 4 are not specifically limited and can be adjusted according to actual needs.

[0044] In some embodiments, such as Figure 1and Figure 2 As shown, both the upper arc-shaped end wall 1 and the lower arc-shaped end wall 2 can be provided with end wall mounting holes, and brass graphite bushings 14 can be installed in the provided end wall mounting holes. The gap between the end wall mounting holes and the brass graphite bushings 14 can meet the preset gap installation conditions. The middle of the tail-edge drive shaft and the front-edge drive shaft included in the above-mentioned adjustment device can be provided with elastic sealing rings. The provided elastic sealing rings contact the brass graphite bushings 14 in the end wall mounting holes. The connection method between the end wall mounting holes and the brass graphite bushings 14 can be embedded, and is not specifically limited here. It should be noted that the above-mentioned preset gap installation conditions can be that the end wall mounting holes and the brass graphite bushings are assembled with a micro-gap. Here, the range of the micro-gap assembly gap is not limited; for example, the gap range of the micro-gap assembly can be 0.01 to 0.05 mm. The connection between the aforementioned elastic sealing ring and the aforementioned trailing edge drive shaft 5 and the aforementioned leading edge drive shaft 6 can be an embedded method, which is not specifically limited here and can be adjusted according to actual needs. The connection between the aforementioned elastic sealing ring and the aforementioned trailing edge drive shaft 5, and the connection between the aforementioned elastic sealing ring and the aforementioned leading edge drive shaft 6, can both be interference fits, effectively reducing gas leakage in the flow field.

[0045] Optionally, such as Figure 1 As shown, the upper arc-shaped end wall 1, the lower arc-shaped end wall 2, the support positioning plate 11 connected to the left side of the end wall, and the support positioning plate 11 connected to the right side of the end wall can form a closed flow channel. The connected support positioning plate 11 can be convex in shape to mate with the upper arc-shaped end wall 1 and the lower arc-shaped end wall 2. The closed flow channel represents the flow path enclosed by the upper arc-shaped end wall 1, the lower arc-shaped end wall 2, the support positioning plate 11 connected to the left side of the end wall, and the support positioning plate 11 connected to the right side of the end wall. The closed flow channel can be used to install a preset number of adjustment devices to construct the basic space for simulating a flow field. Here, the shape of the support positioning plate 11 is not specifically limited and can be adjusted according to actual needs.

[0046] Optionally, such as Figure 1 As shown, the trailing edge drive ring 7 can be installed on the top of the upper arc-shaped end wall 1. The leading edge drive ring 8 can be installed on the bottom of the lower arc-shaped end wall 2. The top of the upper arc-shaped end wall 1 is located outside the closed flow channel, and the bottom of the lower arc-shaped end wall 2 is located outside the closed flow channel.

[0047] Optionally, both the trailing edge drive shaft 5 and the leading edge drive shaft 6 may be provided with mounting grooves. An elastic sealing ring can be installed in the mounting groove. The elastic sealing ring can make contact with the brass graphite bushing 14 in the end-wall mounting hole. A sealing contact can be established between the trailing edge drive shaft 5 and the brass graphite bushing 14 in the end-wall mounting hole, and between the leading edge drive shaft 6 and the brass graphite bushing 14 in the end-wall mounting hole. The elastic sealing ring can be made of rubber, and the mounting groove can be machined. No specific limitations are placed on the material of the elastic sealing ring or the method of setting the mounting groove; adjustments can be made according to actual needs. It should be noted that the sealing contact method can further reduce the occurrence of gaps, thereby reducing the possibility of gas leakage from the blade inlet flow field adjustment device.

[0048] Optionally, the trailing edge drive shaft and the leading edge drive shaft can be collinear in vertical space to form a central axis. The offset of one side of the trailing edge blade towards the central axis can be 0.1–0.5 mm. Setting the offset of one side of the trailing edge blade 3 towards the central axis to 0.1–0.5 mm can reduce the formation of a protrusion at the junction between the leading edge blade 4 and the trailing edge blade 3, thus reducing its impact on the flow field stability at the gap between the combined blades. Here, the offset range is not specifically limited and can be adjusted according to actual needs. One side of the trailing edge blade 3 can refer to the edge of one side of the trailing edge blade 3, rather than the entire trailing edge blade 3 or other parts. It should be noted that the protrusion formed at the junction between the leading edge blade 4 and the trailing edge blade 3 can be the portion of the trailing edge blade 3 that protrudes relative to the leading edge blade 4 during rotation.

[0049] Optionally, the shaft body of the trailing edge drive shaft 5, which passes through the upper arc-shaped end wall 1 and is located within the closed flow channel, can be a first fixed shaft body. The shaft body protruding after passing through the fixing hole of the trailing edge blade 3 can be a first limiting shaft body. The first limiting shaft body can be inserted into the limiting hole of the leading edge blade 4. The middle part of the trailing edge drive shaft 5 can be embedded in the brass-graphite bushing 14 within the upper arc-shaped end wall 1. The first fixed shaft body can be square in shape to restrict rotation after sealing contact with the fixing hole of the trailing edge blade 3. The first limiting shaft body can be cylindrical in shape to not affect the rotation of the overall structure after sealing contact with the limiting hole. The specific shape of the middle part of the trailing edge drive shaft 5 can be cylindrical. Here, the specific shapes of the first fixed shaft body, the first limiting shaft body, and the middle part of the trailing edge drive shaft 5 are not specifically limited and can be adjusted according to actual needs.

[0050] Optionally, such as Figure 3As shown, the shaft of the trailing edge drive shaft 5 located outside the closed flow channel can be connected to one end of the trailing edge connecting rod 12. The other end of the trailing edge connecting rod 12 can be connected to the trailing edge drive ring 7. Any of the preset number of adjusting devices can be connected to a trailing edge angle disk 9 after being connected to one end of the trailing edge connecting rod 12. The trailing edge drive shaft 5 is embedded in the trailing edge angle disk 9. Here, the connection method between any of the trailing edge drive shafts 5 and the trailing edge angle disk 9 is not specifically limited and can be adjusted according to actual needs. The number of trailing edge angle disks 10 can be one. The shape of the shaft of the trailing edge drive shaft 5 located outside the closed flow channel can be square, the shape of the trailing edge angle disk 9 can be disc-shaped, and the minimum scale value of the trailing edge angle disk 9 can be 0.5° to detect the blade angle value. Here, the specific shape of the shaft body of the trailing edge drive shaft 5 located outside the closed flow channel, the specific shape of the trailing edge angle disk 9, the minimum scale of the trailing edge angle disk 9, and the number of the trailing edge angle disks 9 are not specifically limited and can be adjusted according to actual needs. It should be noted that since the trailing edge drive shaft 5 is connected to the trailing edge drive ring 7 through the trailing edge connecting rod 12, the angle of the trailing edge blade 3 can be adjusted by the trailing edge drive ring 7. It should be noted that in use, the trailing edge angle disk 9 can display the rotation angle of the trailing edge blade 3 in real time.

[0051] Optionally, the shaft body of the aforementioned leading edge drive shaft 6, which passes through the aforementioned lower arc-shaped end wall 2 and is located within the closed flow channel, can be a second fixed shaft body. The shaft body protruding after the aforementioned second fixed shaft body passes through the limiting hole of the aforementioned trailing edge blade 3 can be a second limiting shaft body. The aforementioned second limiting shaft body can pass through the fixing hole of the aforementioned leading edge blade 4. The middle part of the aforementioned leading edge drive shaft 6 can be embedded in the brass-graphite bushing 14 within the aforementioned lower arc-shaped end wall 2. The shape of the aforementioned second fixed shaft body can be square, to restrict rotation after sealing contact with the fixing hole of the aforementioned leading edge blade 4. The shape of the aforementioned second limiting shaft body can be cylindrical, so that it does not affect the rotation of the overall structure after sealing contact with the limiting hole. The specific shape of the middle part of the aforementioned leading edge drive shaft 5 can be cylindrical. Here, the specific shapes of the aforementioned second fixed shaft body, the aforementioned second limiting shaft body, and the middle part of the aforementioned leading edge drive shaft 6 are not specifically limited and can be adjusted according to actual needs.

[0052] Optionally, such as Figure 3As shown, the shaft of the aforementioned leading-edge drive shaft 6 located outside the aforementioned closed flow channel can be connected to one end of the aforementioned leading-edge connecting rod 13. The other end of the aforementioned leading-edge connecting rod 13 can be connected to the aforementioned leading-edge drive ring 8. Any of the aforementioned preset number of adjusting devices, including the leading-edge drive shaft 6, is connected to one end of the trailing-edge connecting rod 13 and then connected to a leading-edge angle disk 10. The aforementioned leading-edge drive shaft 6 is embedded in the aforementioned leading-edge angle disk 10. Here, the connection method between the aforementioned leading-edge drive shaft 6 and the aforementioned leading-edge angle disk 10 is not specifically limited and can be adjusted according to actual needs. The number of the aforementioned leading-edge angle disk 10 can be one. The shape of the shaft of the aforementioned leading-edge drive shaft 6 located outside the aforementioned closed flow channel can be square, the shape of the aforementioned leading-edge angle disk 10 can be disc-shaped, and the minimum scale value of the aforementioned leading-edge angle disk 10 can be 0.5° to detect the angle value of the blade. Here, the specific shape of the shaft body of the leading edge drive shaft 6 located outside the closed flow channel, the specific shape of the leading edge angle disk 10, the minimum scale of the leading edge angle disk 10, and the number of the leading edge angle disks 10 are not specifically limited and can be adjusted according to actual needs. It should be noted that since the leading edge drive shaft 6 is connected to the leading edge drive ring 8 through the leading edge connecting rod 13, the angle of the leading edge blade 4 can be adjusted by the leading edge drive ring 8. It should also be noted that in use, the leading edge angle disk 10 can display the rotation angle of the leading edge blade 4 in real time.

[0053] Optionally, such as Figure 1 As shown, both the trailing edge drive ring 7 and the leading edge drive ring 8 can be connected to drive components. Both the trailing edge drive ring 7 and the leading edge drive ring 8 can rotate circumferentially through the connected drive components. The circumferential rotation of the trailing edge drive ring 7 can adjust the angle of each trailing edge blade 3 in the preset number of adjustment devices. The circumferential rotation of the leading edge drive ring 8 can adjust the angle of each leading edge blade 4 in the preset number of adjustment devices. The leading edge drive ring 8 can rotate each leading edge blade 4 included in the preset number of adjustment devices to the same angle. The trailing edge drive ring 7 can rotate each trailing edge blade 3 included in the preset number of adjustment devices to the same angle. The angles of the leading edge blade 4 and the trailing edge blade 3 included in the preset number of adjustment devices can be the same or different. Specifically, the circumferential rotation of the trailing edge drive ring 7 can simultaneously adjust the angle of each trailing edge blade 3 in the preset number of adjustment devices, and the circumferential rotation of the leading edge drive ring 8 can simultaneously adjust the angle of each leading edge blade 4 in the preset number of adjustment devices. The aforementioned drive component can be a stepper motor. Here, the specific type of drive component is not specifically limited and can be adjusted according to actual needs. This allows for the same angle for all leading-edge blades and the same angle for all trailing-edge blades.

[0054] In the process of adopting technical solutions to address the aforementioned technical problems, the following technical problem two often arises: In wind farm testing scenarios, the compressor blade inlet flow field adjustment device, after long-term use in wind farm testing, has experienced wear on some blades, resulting in poor accuracy of the overall wind farm test data; in multi-condition rapid scanning scenarios, motor failure can cause the drive ring to misjudge the angle dial scale and exceed the limit blade angle threshold, leading to equipment damage and flow field distortion. The conventional solution to this technical problem two is generally to either replace the entire blade inlet adjustment device or set an angle threshold to trigger an emergency stop. However, considering the drawbacks of replacing the entire blade inlet adjustment device and setting an angle threshold to trigger an emergency stop, and leveraging the advantages of our organization in the research and development of compressor blade inlet flow field adjustment devices, we have decided to adopt the following solution:

[0055] Optionally, the inner wall of each end wall mounting hole of the upper arc-shaped end wall 1 and the lower arc-shaped end wall 2 can be semi-permanently fitted with a wear-resistant substrate. The wear-resistant substrate can be a hardened steel bushing. The outer surface of the hardened steel bushing and the end wall mounting hole can be connected by an interference fit. The brass graphite bushing 14 can be embedded in the wear-resistant substrate. The gap between the wear-resistant substrate and the brass graphite bushing 14 can meet the target gap installation conditions. Both the brass graphite bushing 14 and the combined blade are detachable. Adjustable mechanical stops can be installed at both ends of the circumferential rotation track of the trailing edge drive ring 7 and the leading edge drive ring 8. The material of the installed adjustable mechanical stops can be hardened steel. The installed adjustable mechanical stops can be bolted to the reserved threaded hole of the upper arc-shaped end wall 1 or bolted to the reserved threaded hole of the lower arc-shaped end wall 2. The adjustable mechanical stop contact surface can be embedded with a PTFE gasket to reduce metal-on-metal collision damage to the trailing edge drive ring 7 and the leading edge drive ring 8. The wear-resistant substrate can be made of fully hardened steel. The specific material of the wear-resistant substrate is not specifically limited and can be adjusted according to actual needs. The connection between the outer surface of the hardened steel bushing and the end-wall mounting hole can be an interference fit to improve the stability of the wear-resistant substrate within the end-wall mounting hole. The target clearance installation condition can be a micro-clearance assembly between the wear-resistant substrate and the brass-graphite bushing 14 to reduce gas flow leakage caused by the presence of gaps. The range of the micro-clearance assembly is not limited; for example, the gap range can be 0.01–0.05 mm. The design of the wear-resistant substrate allows for replacement of only the damaged blade without damaging the end-wall mounting hole when blade damage occurs. The pre-drilled threaded hole can be used for bolt fixing of the adjustable mechanical stop. The aforementioned circumferential rotation trajectory represents the motion trajectory of the trailing edge drive ring 7 reciprocating to adjust the trailing edge blade angle, and the motion trajectory of the leading edge drive ring 8 reciprocating to adjust the leading edge blade angle. The adjustable mechanical stop can be square in shape. Here, the specific shape of the adjustable mechanical stop is not specifically limited and can be adjusted according to actual needs. It should be noted that the material of the adjustable mechanical stop and the connection method between the adjustable mechanical stop and the end wall are not specifically limited and can be adjusted according to actual needs. A polytetrafluoroethylene (PTFE) gasket is embedded in the contact surface of the adjustable mechanical stop, which can reduce metal-on-metal collision damage to the trailing edge drive ring 7 and the leading edge drive ring 8. It should be noted that the material of the embedded gasket is not specifically limited and can be adjusted according to actual needs. The adjustable mechanical stop can directly and physically intercept the overtravel of the drive ring, limiting the rotation of the entire blade, and reducing the possibility of the drive ring exceeding the limit blade angle threshold, thus reducing equipment damage and flow field distortion.

[0056] The above optional embodiments, as an inventive point of this disclosure, solve the technical problem of "causing some damage to some blades, resulting in affecting the overall wind field test data; causing the drive ring to break through the limit blade angle threshold, leading to equipment damage and flow field distortion." The specific factors causing some damage to some blades and affecting the overall wind field test data are as follows: In wind field testing scenarios, the compressor blade inlet flow field adjustment device is used for a long time, causing some blades to wear, resulting in poor accuracy of the overall wind field test data; in multi-condition rapid scanning scenarios, due to motor failure, the drive ring misjudges the angle dial scale and breaks through the limit blade angle threshold, leading to equipment damage and flow field distortion. If the above factors are resolved, the need to completely replace the inlet flow field adjustment device of the blade cascade can be reduced, and the occurrence of the drive ring exceeding the limit blade angle threshold can be decreased. To achieve this effect, the inner wall of the end wall mounting hole used in this embodiment is provided with a wear-resistant substrate to reduce wear on the equipment when replacing components. The material is hardened steel to improve the long-term performance of the wear-resistant substrate. The interference fit setting can increase the stability of the wear-resistant substrate installation and reduce the risk of falling off. Adjustable mechanical blocks can be installed at both ends of the circumferential rotation track of the aforementioned trailing edge drive ring and the aforementioned leading edge drive ring. These blocks can directly and physically intercept the overtravel of the drive ring, limit the rotation of the entire blade, reduce the occurrence of the drive ring exceeding the limit blade angle threshold, and reduce the occurrence of flow field distortion caused by equipment damage.

[0057] In the process of adopting technical solutions to address the aforementioned technical problems, the following technical problem three often arises: In compressor adaptability tests simulating dusty environments, the lack of a dedicated filtration structure at the inlet of traditional compressor blade cascade test devices allows impurities such as pipe debris and dust agglomerates carried in the airflow to directly enter the closed flow channel, causing test interruptions, affecting the continuity of test data, and consequently resulting in poor experimental results. The conventional solution to this technical problem three is generally to use an unprotected grid design. However, considering the drawbacks of an unprotected grid design and leveraging the advantages of our organization in developing compressor blade cascade inlet flow field adjustment devices, we have decided to adopt the following solution:

[0058] Optionally, the aforementioned metal mesh cover can be disposed at the air inlet end of the aforementioned closed flow channel. The metal mesh cover can be connected to the support positioning plate, upper arc-shaped end wall, and lower arc-shaped end wall at the air inlet of the aforementioned closed flow channel. The mesh aperture of the aforementioned metal mesh cover can be in the range of 0.5 to 1 mm, used to filter particles with a diameter greater than 0.5 mm in the airflow flowing into the aforementioned closed flow channel. Both sides of the aforementioned metal mesh cover can be sprayed with a polyurethane coating containing microcapsules. The thickness of the aforementioned polyurethane coating can be in the range of 0.05 to 0.1 mm. The aforementioned microcapsules can be made of polyurea-formaldehyde shell material, encapsulating liquid polyurethane inside. The aforementioned microcapsules are uniformly dispersed in the coating and have a particle size of 10 to 50 μm. The aforementioned air inlet end can be the side where the gas flows into the aforementioned closed flow channel. The material of the aforementioned metal mesh cover can be 304 stainless steel. The thickness range of the aforementioned polyurethane coating is such that it does not block the mesh aperture of the aforementioned metal mesh cover and does not change the outline of the aforementioned metal mesh cover. The particle size of the aforementioned microcapsules is sufficient to allow for the self-healing of the metal mesh coating, while also not interfering with the flow field or clogging the mesh openings of the metal mesh. Here, no specific limitations are placed on the material of the metal mesh, the thickness of the polyurethane coating, or the particle size of the microcapsules; these can be adjusted according to actual needs.

[0059] The above optional embodiments, as an inventive point of this disclosure, solve the technical problem of "impurities such as pipe debris and dust agglomerates carried in the airflow directly entering the closed flow channel, causing test interruption, affecting the continuity of test data, and thus resulting in poor experimental results." The specific factors causing impurities in the airflow, leading to test interruption, affecting the continuity of test data, and resulting in poor experimental results are as follows: In compressor adaptability tests simulating dusty environments, because the inlet of traditional compressor blade test devices lacks a dedicated filtration structure, impurities such as pipe debris and dust agglomerates carried in the airflow directly enter the closed flow channel, causing test interruption, affecting the continuity of test data, and thus resulting in poor experimental results. If the above factors are resolved, the occurrence of test interruptions can be reduced, and the impact on the continuity of test data can be decreased. To achieve this effect, the embodiments of this disclosure design a metal mesh cover to reduce the intrusion of impurity particles into the closed flow channel, and design a polyurethane coating containing microcapsules on the metal mesh cover. When cracks appear in the metal mesh cover, the cracks will squeeze and puncture the microcapsules on the path of crack propagation during the crack propagation process. The liquid polyurethane inside the microcapsules flows out and solidifies within 30 to 60 seconds after contact with air, automatically filling the crack gaps, restoring the structural integrity and filtration sealing of the metal mesh cover, and reducing the entry of impurity particles into the closed flow channel through the cracks.

[0060] In the process of adopting technical solutions to address the aforementioned technical problems, the following technical problem often arises: In high-precision angle-of-attack simulation tests, due to mechanical motor transmission clearances and airflow pulsations, deviations occur between the actual blade angle and the set angle value, leading to an increase in the angle-of-attack error of the outlet flow field. This severely affects the reliability of the blade aerodynamic data, necessitating repeated simulation tests and resulting in prolonged simulation time. The conventional solution to this fourth technical problem is to measure all blade angles using a laser tracker before the test and manually adjust them to forcibly eliminate the deviation. However, considering the drawbacks of manually adjusting the preload of the plug screws to forcibly eliminate the deviation, and leveraging the advantages of our organization in developing compressor blade inlet flow field adjustment devices, we have decided to adopt the following solution:

[0061] Optionally, a pressure sensor group can be installed inside the aforementioned closed flow channel. An angle sensor group, a drive ring controller group, a switchable permanent magnet lock group, an electromagnetic engager group, a circuit breaker, and a processor can be installed outside the aforementioned closed flow channel. The pressure sensor group, angle sensor group, drive ring controller group, switchable permanent magnet lock group, electromagnetic engager group, circuit breaker, and processor can all be communicatively connected. The pressure sensor group can include up to four pressure sensors. Two pressure sensors in the pressure sensor group can be installed on the upper arc-shaped end wall inside the aforementioned closed flow channel, and two pressure sensors can be installed on the lower arc-shaped end wall inside the aforementioned closed flow channel, forming a sensor group capable of detecting the pressure data generated by the fluid within the closed flow channel. The pressure sensor group can be embedded, which does not affect the flow field stability inside the closed flow channel. The angle sensor group can include an angle sensor installed on the leading edge angle disk and an angle sensor installed on the trailing edge angle disk. The aforementioned angle sensor group can be used to monitor in real time the angles displayed on the leading edge angle disk and the trailing edge angle disk at the current moment. The angle sensor group can contain two angle sensors. The drive ring controller group can be installed outside the aforementioned closed flow channel. The drive ring controller group can be a controller that controls the circumferential rotation of the leading edge drive ring and the trailing edge drive ring. The drive ring controller group can include a leading edge drive ring controller and a trailing edge drive ring controller. The leading edge drive ring controller and the leading edge drive ring are embedded and fixed, and the trailing edge drive ring controller and the trailing edge drive ring are also embedded and fixed.

[0062] For example, the drive ring controller can be a stepper motor controller, capable of receiving angle signals output by the processor, converting electrical pulse signals into angular displacement of the stepper motor, controlling the rotation angle of the drive ring, and then driving the combined blades through the connecting rod and drive shaft to achieve angle adjustment. The number of drive ring controllers in the aforementioned drive ring controller group can be two. The processor can be located on the side of the upper arc-shaped end wall 1 located outside the closed flow channel. Here, the number and model of the aforementioned pressure sensor group, angle sensor group, and drive ring controller group are not specifically limited and can be adjusted according to actual needs. The aforementioned circuit breaker can be adjacent to the aforementioned electromagnetic attractor group. The switchable permanent magnet locker in the aforementioned switchable permanent magnet locker group can be a switchable permanent magnet locker that locks when energized and releases when de-energized. One switchable permanent magnet locker in the aforementioned switchable permanent magnet locker group is fixed to the aforementioned leading edge drive ring with screws, and the other switchable permanent magnet locker is fixed to the aforementioned trailing edge drive ring with screws. When the aforementioned switchable permanent magnet locker group is connected to the aforementioned drive device, a working distance needs to be maintained between them. The working distance can be in the range of 0.5 to 2 cm. Here, the connection method between the switchable permanent magnet locking assembly and the drive device, and the gap range, are not specifically limited. The electromagnetic actuator in the electromagnetic actuator assembly can be an electromagnetic actuator that locks when energized and releases when de-energized. The switchable permanent magnet locking assembly can be installed on the drive device so that it rotates with the drive device during blade adjustment and locks the drive device after adjustment. The electromagnetic actuator assembly can be installed on the side of the support positioning plate outside the closed flow channel to attract it, so that when the drive device needs to be fixed during adjustment, the switchable permanent magnet locking assembly can work together with the switchable permanent magnet locking assembly to lock and fix the angle of the combined blades. One electromagnetic actuator in the electromagnetic actuator assembly is fixed with screws to the side of the support positioning plate outside the closed flow channel, and the other electromagnetic actuator is fixed with screws to the side of the other support positioning plate outside the closed flow channel. When the aforementioned electromagnetic actuator is connected to the aforementioned support positioning plate assembly, a preset distance must be maintained between them. This preset distance can range from 0.5 to 2 cm. No specific limitations are made regarding the connection method or the preset distance range between the electromagnetic actuator and the support positioning plate. The aforementioned circuit breaker can be energized and locked when the angle of the combined blades needs to be fixed, and de-energized and released when locking is not required, thereby releasing the angle of the combined blades. The number of the aforementioned switchable permanent magnet locking assembly can be two. The number of the aforementioned electromagnetic actuator assembly can be two. No specific limitations are made regarding the installation position and model of the aforementioned switchable permanent magnet locking assembly, the aforementioned circuit breaker, and the aforementioned electromagnetic actuator; adjustments can be made according to actual needs.For example, the switchable permanent magnet lock can be an e-magnetsukLN031A / B switchable permanent magnet lock; the circuit breaker can be a miniature circuit breaker (MCB); the aforementioned electromagnetic actuator can be a KLFD4.25 electromagnetic actuator. For example, the angle sensor can be a TMR3110 angle sensor. The aforementioned processor can be an instrument for processing various information. For example, the processor can be a central processing unit. The aforementioned pressure sensor group, the aforementioned angle sensor group, the aforementioned drive ring controller group, and the aforementioned processor are all communicatively connected. It should be noted that the aforementioned communication connections can include, but are not limited to, 3G / 4G connections, WiFi connections, Bluetooth connections, WiMAX connections, Zigbee connections, UWB (ultrawideband) connections, and other currently known or future developed communication methods. Here, the specific locations of the aforementioned pressure sensor group, the aforementioned angle sensor group, the aforementioned drive ring controller group, the aforementioned switchable permanent magnet lock group, the aforementioned electromagnetic actuator group, the aforementioned circuit breaker, and the aforementioned processor are not limited and can be adjusted according to actual needs.

[0063] The first step involves receiving pressure information from the aforementioned pressure sensor group regarding the closed flow channel, and receiving current angle information from the aforementioned angle sensor group regarding the leading-edge blade and the trailing-edge blade. The pressure information represents the pressure values ​​of the upper and lower arc-shaped endwalls at the current moment. The current angle information represents the angles of the leading-edge blade and the trailing-edge blade included in the combined blade assembly at the current moment.

[0064] The second step is to determine the flow state information of the closed flow channel based on the aforementioned pressure information. The flow state characteristics may include gas velocity and gas flow rate. The gas velocity characterizes the speed of the gas, and the gas flow rate characterizes the flow rate. In practice, the processor can determine the preset fluid characteristic correspondence information corresponding to the aforementioned pressure information from a preset fluid characteristic correspondence information set. Then, the flow state information included in the determined preset fluid characteristic correspondence information is used as the flow state information corresponding to the closed flow channel. The preset fluid characteristic correspondence information in the aforementioned preset fluid characteristic correspondence information set can characterize the correspondence between pressure information and fluid state information. For example, the preset fluid characteristic correspondence information could be: "Pressure information: Upper arc-shaped end wall pressure can be 520 Pa, lower arc-shaped end wall pressure can be 510 Pa; Fluid state information: Gas flow rate can be 0.024 m³ / s." 3 / s, the gas flow rate can be 1.2m / s.

[0065] The third step involves determining the current angular position information of the combined blade based on the current angle information of the leading-edge blade and the trailing-edge blade. The current angular position information of the combined blade represents the angle between the leading-edge blade and the trailing-edge blade included in the combined blade at the current moment. In practice, the processor can input the current angle information into a sensor calibration and angle analysis model to obtain the current angular position information of the combined blade. This sensor calibration and angle analysis model can be a model that takes the current angle information of the leading-edge blade and the trailing-edge blade collected by the angle sensor group as input and the current angular position information of the combined blade as output. This sensor calibration and angle analysis model can be trained based on the correspondence between the current angle information collected by the angle sensor group and the current angular position information of the combined blade. For example, the sensor calibration and angle analysis model can be a linear regression model.

[0066] The fourth step involves determining the target angle value of the combined blades based on the current angular position information and the flow state information. The target angle value represents the required angle between the leading-edge blade and the trailing-edge blade of the combined blade. The processor can determine the corresponding preset target angle value information from a preset target angle value correspondence information set. Then, the target angle value included in the determined preset target angle value correspondence information is used as the target angle value for the combined blade. The preset target angle value correspondence information in the preset target angle value correspondence information set represents the correspondence between the current angular position information, the flow state information, and the target angle value of the combined blades. For example, the preset target angle value correspondence information could be: "Current angular position information: the angle of the leading-edge blade can be 45°, and the angle of the trailing-edge blade can be 30°; fluid state information: the gas flow rate can be 0.024 m³ / s." 3 / s, the gas flow rate can be 1.2m / s; the target angle value can be 15°.

[0067] Fifth, in response to determining that the current angular position information differs from the target angular value, the processor controls the switchable permanent magnet lock group to release the drive device, and controls the drive ring controller group to rotate the combined blade according to the target angular value of the combined blade. In practice, firstly, in response to determining that the current angular position information differs from the target angular value, the processor can control the circuit breaker to disconnect the power, so that the electromagnetic attractor and the switchable permanent magnet lock group no longer restrict the drive device, thus not restricting the adjustment of the drive device. Then, the processor can send the target angular value of the combined blade to the drive ring controller group, so that the drive ring controller group controls the trailing edge drive ring 7 and the leading edge drive ring 8 to rotate the combined blade according to the target angular value, thereby adjusting the angle of the combined blade.

[0068] Step six: In response to detecting the rotation end signal of the aforementioned drive ring controller group, control the aforementioned switchable permanent magnet lock group to lock the aforementioned drive device, and execute the aforementioned detection step again. The aforementioned rotation end signal indicates that the aforementioned drive ring controller group has stopped rotating the aforementioned combined blades. In practice, in response to detecting the rotation end signal of the aforementioned drive ring controller group, the aforementioned processor can control the aforementioned circuit breaker to be energized, so that the aforementioned electromagnetic attractor and the aforementioned switchable permanent magnet lock group restrict the aforementioned drive device, thereby limiting the rotation of the aforementioned drive device.

[0069] The above-described optional embodiments, as an inventive point of this disclosure, solve the technical problem of "a deviation between the actual blade angle and the preset angle value, leading to an increase in the angle of attack error of the outlet flow field, which seriously affects the reliability of the blade aerodynamic data". The specific factors causing the deviation between the actual blade angle and the preset angle value, leading to an increase in the angle of attack error of the outlet flow field, and seriously affecting the reliability of the blade aerodynamic data are as follows: In high-precision angle of attack simulation tests, due to mechanical motor transmission clearance and airflow pulsation, a deviation between the actual blade angle and the set angle value occurs, leading to an increase in the angle of attack error of the outlet flow field, seriously affecting the reliability of the blade aerodynamic data, thus requiring repeated simulation tests, resulting in a long simulation test time. If the above factors are addressed, the deviation between the actual blade angle and the preset angle value can be reduced, leading to an increase in the angle of attack error of the outlet flow field. To achieve this effect, the compressor blade inlet flow field adjustment device disclosed herein first uses the aforementioned pressure sensor group to collect pressure information inside the aforementioned closed flow channel. Based on the pressure information, it can be determined whether the pressure information of the current combined blade is within the target flow field state. Based on the current angle information and the preset sensor calibration and angle analysis model, the current angle position information of the combined blade is determined. Based on the current angle position information and the flow state characteristics of the fluid inside the aforementioned closed flow channel, the target angle value of the combined blade can be determined, so as to adjust the angle of the combined blade. Based on the target angle value, the drive ring controller group is controlled to adjust the angle of the combined blade, thereby achieving the optimal adjustment angle of the combined blade. After the adjustment is completed, it is also necessary to check whether the angle of the combined blade is the same as the target angle value. If they are different, a second adjustment will be made. The device will continuously monitor the pressure information and current angle position information of the combined blade, and adjust the angle of the combined blade in real time. This reduces the transmission backlash and airflow pulsation in the mechanical motor, thus mitigating deviations between the actual and preset blade angles. It also reduces the expansion of the exit flow field angle of attack error and improves the reliability of the blade aerodynamic data. The aforementioned flow field adjustment device also includes the switchable permanent magnet lock group, the electromagnetic actuator group, and the circuit breaker. When blade angle adjustment is not required, the circuit breaker can be energized, locking the drive device with the switchable permanent magnet lock group and the electromagnetic actuator group. When blade angle adjustment is required, the circuit breaker can be de-energized, releasing the drive device with the switchable permanent magnet lock group and the electromagnetic actuator group.

[0070] The various embodiments of this disclosure have the following beneficial effects: The flow field adjustment device applied to the compressor blade inlet of some embodiments of this disclosure can reduce the angular deviation of the overall rotation adjustment, thereby improving experimental results, reducing the need for repeated adjustments to the experimental angle of attack, shortening the time consumed, and reducing the occurrence of non-physical abrupt changes in the flow field caused by increased flow leakage, which could damage the simulation's realism, thus improving the accuracy of experimental data and enhancing experimental results. Specifically, the reason for the numerous technical problems of existing flow field adjustment devices applied to compressor blade inlets is that: when large angle changes occur, a large gap needs to be reserved between the adjustable guide vane and the end wall to reduce friction between the adjustable guide vane and the end wall during rotation, causing increased flow leakage and resulting in non-physical abrupt changes in the flow field, damaging the simulation's realism and leading to poor experimental results; since the adjustable guide vane is adjusted by rotating as a whole through a single-piece structure and a rotating shaft, the angle of the single-piece adjustable guide vane needs to be adjusted by overall rotation, resulting in a large angular deviation in the overall rotation adjustment, leading to poor experimental results, requiring repeated adjustments to the experimental angle of attack, making the experimental steps cumbersome and time-consuming. Based on this, some embodiments of this disclosure provide a flow field adjustment device for the inlet of a compressor blade cascade. The device comprises an end wall, a support and positioning plate, a drive device, and a predetermined number of adjustment devices. The end wall includes an upper arc-shaped end wall and a lower arc-shaped end wall, with the support and positioning plate connected to both the left and right sides of the end wall. Each of the predetermined number of adjustment devices includes a combined blade, a leading-edge connecting rod, a leading-edge drive shaft, a trailing-edge connecting rod, and a trailing-edge drive shaft. The drive device includes a leading-edge drive ring and a trailing-edge drive ring. The combined blade includes a leading-edge blade and a trailing-edge blade. The trailing edge drive ring adjusts the angle of the trailing edge blade via the trailing edge drive shaft and the trailing edge connecting rod. The leading edge drive ring adjusts the angle of the leading edge blade via the leading edge drive shaft and the leading edge connecting rod. Both the upper and lower arc-shaped end walls are provided with end wall mounting holes, and brass graphite bushings are installed in the end wall mounting holes. The gap between the end wall mounting holes and the brass graphite bushings meets the preset gap installation conditions. The middle of both the trailing edge drive shaft and the leading edge drive shaft included in the adjustment device is provided with elastic sealing rings, and the elastic sealing rings are in contact with the brass graphite bushings in the end wall mounting holes.Because the trailing edge drive ring can adjust the angle of the trailing edge blades via the trailing edge drive shaft and the trailing edge connecting rod, and the leading edge drive ring can adjust the angle of the leading edge blades via the leading edge drive shaft and the leading edge connecting rod, the trailing edge blades and the leading edge blades can rotate independently to change and adjust the angle of attack. This allows for small-scale adjustments to the angles of the trailing and leading edge blades to adjust the inflow angle of attack, rather than large-scale adjustments to the overall rotation angle of a single-piece adjustable guide vane. This reduces the overall rotation angle deviation and improves the flexibility of angle adjustment. Furthermore, because the leading and trailing edge blades are adjusted independently at small angles, the clearance between the blades and the endwall can be reduced during large angle changes. Also, because the clearance between the endwall mounting hole and the brass-graphite bushing meets the preset clearance installation conditions, which allow for a micro-clearance assembly between the endwall mounting hole and the brass-graphite bushing. Therefore, the smaller gaps between the blade and the endwall, as well as between the endwall mounting hole and the brass-graphite bushing, reduce the likelihood of non-physical abrupt changes in the flow field caused by increased flow due to gap leakage, which could compromise the simulation's realism. This improves the accuracy of experimental data and enhances experimental results. Furthermore, it reduces the overall rotation adjustment angle deviation, thereby improving experimental performance, reducing the need for repeated adjustments to the angle of attack, shortening the time required, and minimizing the risk of non-physical abrupt changes in the flow field caused by increased flow due to gap leakage, thus improving the accuracy of experimental data and enhancing experimental results.

[0071] The following is for reference. Figure 5 It shows a schematic diagram of the structure of an electronic device 500 (e.g., a computing device) suitable for implementing some embodiments of the present disclosure.

[0072] Figure 5 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.

[0073] like Figure 5 As shown, the electronic device 500 may include a processing unit 501 (e.g., a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 502 or a program loaded from a storage device 508 into a random access memory (RAM) 503. The RAM 503 also stores various programs and data required for the operation of the electronic device 500. The processing unit 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0074] Typically, the following devices can be connected to I / O interface 505: input devices 506 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 507 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 508 including, for example, magnetic tapes, hard disks, etc.; and communication devices 509. Communication device 509 allows electronic device 500 to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 5 An electronic device 500 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 5 Each box shown can represent a device or multiple devices as needed.

[0075] 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 communication device 509, or installed from storage device 508, or installed from ROM 502. When the computer program is executed by processing device 501, it performs the functions defined in the methods of some embodiments of this disclosure.

[0076] 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.

[0077] 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.

[0078] 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, which, when executed by the electronic device, cause the electronic device to: further configure the processor to perform the following steps: receiving pressure information of the closed flow channel collected by the pressure sensor group, and receiving current angle information of the leading edge blade and the trailing edge blade collected by the angle sensor group; determining flow state information of the closed flow channel based on the pressure information, wherein the flow state characteristics include airflow velocity and airflow rate; determining current angle position information of the combined blade based on the current angle information of the leading edge blade and the trailing edge blade; determining a target angle value of the combined blade based on the current angle position information of the combined blade and the flow state information; controlling the switchable permanent magnet lock group to release the drive device in response to determining that the current angle position information is different from the target angle value, and controlling the drive ring controller group to rotate the combined blade based on the target angle value of the combined blade; controlling the switchable permanent magnet lock group to lock the drive device in response to detecting a rotation end signal of the drive ring controller group, and re-executing the detection step.

[0079] 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).

[0080] 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.

[0081] 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.

[0082] 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 flow field adjustment device for the inlet of a compressor blade cascade, characterized in that, The blade inlet flow field adjustment device includes an end wall, a support and positioning plate, a drive device, and a preset number of adjustment devices, wherein... The end wall includes an upper arc-shaped end wall and a lower arc-shaped end wall, and the support positioning plate is connected to the left and right sides of the end wall; Each of the predetermined number of adjusting devices includes a combined blade, a leading edge connecting rod, a leading edge drive shaft, a trailing edge connecting rod, and a trailing edge drive shaft. The drive device includes a leading-edge drive ring and a trailing-edge drive ring; The combined blade includes a leading edge blade and a trailing edge blade. The trailing edge drive ring adjusts the angle of the trailing edge blade through the trailing edge drive shaft and the trailing edge connecting rod. The leading edge drive ring adjusts the angle of the leading edge blade through the leading edge drive shaft and the leading edge connecting rod. Both the upper arc-shaped end wall and the lower arc-shaped end wall are provided with end wall mounting holes, and brass graphite bushings are provided in the end wall mounting holes. The gap between the end wall mounting holes and the brass graphite bushings meets the preset gap installation conditions. The middle part of the tail edge drive shaft and the front edge drive shaft of the adjustment device are provided with elastic sealing rings, and the elastic sealing rings are in contact with the brass graphite bushings in the end wall mounting holes.

2. The flow field adjustment device for the inlet of a compressor blade cascade according to claim 1, characterized in that, The upper arc-shaped end wall, the lower arc-shaped end wall, the support positioning plate connected to the left side of the end wall, and the support positioning plate connected to the right side of the end wall form a closed flow channel.

3. The flow field adjustment device for the inlet of a compressor blade cascade according to claim 1, characterized in that, The trailing edge drive ring is mounted on the top of the upper arc-shaped end wall, and the leading edge drive ring is mounted on the bottom of the lower arc-shaped end wall.

4. The flow field adjustment device for the inlet of a compressor blade cascade according to claim 1, characterized in that, Both the trailing edge drive shaft and the leading edge drive shaft are provided with mounting grooves, and elastic sealing rings are installed in the mounting grooves. The elastic sealing rings are in extrusion contact with the brass graphite bushings in the mounting holes of the end walls. The trailing edge drive shaft and the brass graphite bushings in the mounting holes of the end walls are in sealed contact, as are the leading edge drive shaft and the brass graphite bushings in the mounting holes of the end walls.

5. The flow field adjustment device for the inlet of a compressor blade cascade according to claim 1, characterized in that, The trailing edge drive shaft and the leading edge drive shaft are collinear in vertical space to form a central axis, and one side of the trailing edge blade is offset from the central axis by 0.1 to 0.5 mm.

6. The flow field adjustment device for the inlet of a compressor blade cascade according to claim 2, characterized in that, The shaft body located in the closed flow channel after the trailing edge drive shaft passes through the upper arc-shaped end wall is the first fixed shaft body. The shaft body protruding after the first fixed shaft body passes through the fixing hole of the trailing edge blade is the first limiting shaft body. The first limiting shaft body is inserted into the limiting hole of the leading edge blade. The middle part of the trailing edge drive shaft is embedded in the brass graphite bushing in the upper arc-shaped end wall.

7. The compressor blade inlet flow field adjustment device according to claim 6, characterized in that, The trailing edge drive shaft is located outside the closed flow channel and is connected to one end of the trailing edge connecting rod. The other end of the trailing edge connecting rod is connected to the trailing edge drive ring. Any one of the preset number of adjustment devices is connected to one end of the trailing edge connecting rod and then connected to a trailing edge angle plate.

8. The flow field adjustment device for the inlet of a compressor blade cascade according to claim 2, characterized in that, The shaft body located in the closed flow channel after the leading edge drive shaft passes through the lower arc-shaped end wall is the second fixed shaft body. The shaft body protruding after the second fixed shaft body passes through the limiting hole of the trailing edge blade is the second limiting shaft body. The second limiting shaft body passes into the fixing hole of the leading edge blade. The middle part of the leading edge drive shaft is embedded in the brass graphite bushing in the lower arc-shaped end wall.

9. The flow field adjustment device for the inlet of a compressor blade cascade according to claim 8, characterized in that, The leading edge drive shaft is located outside the closed flow channel and is connected to one end of the leading edge connecting rod. The other end of the leading edge connecting rod is connected to the leading edge drive ring. Any one of the preset number of adjustment devices is connected to one end of the leading edge connecting rod and then connected to a leading edge angle plate.

10. The flow field adjustment device for the inlet of a compressor blade cascade according to claim 1, characterized in that, Both the trailing edge drive ring and the leading edge drive ring are connected to a drive assembly. Both the trailing edge drive ring and the leading edge drive ring rotate circumferentially through the connected drive assembly. The circumferential rotation of the trailing edge drive ring can adjust the angle of each trailing edge blade in the preset number of adjustment devices. The circumferential rotation of the leading edge drive ring can adjust the angle of each leading edge blade in the preset number of adjustment devices. The leading edge drive ring can rotate each leading edge blade included in the preset number of adjustment devices to the same angle. The trailing edge drive ring can rotate each trailing edge blade included in the preset number of adjustment devices to the same angle. The angle of each leading edge blade included in the preset number of adjustment devices is the same as or different from the angle of each trailing edge blade included in the preset number of adjustment devices.

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