A variable seam height constant blowing flow control device and processing method

Abstract

The present invention provides a variable slot height constant blowing flow control device and a processing method, which relates to the technical field of wind tunnel test jet control. The variable slot height constant blowing flow control device of the present invention comprises a bottom plate and a cover plate, the bottom plate comprises a recessed portion and a fitting portion, the recessed portion is concavely arranged, and the fitting portion is arranged at the top opening edge of the recessed portion; the cover plate and the fitting portion are detachably connected, and after the cover plate and the fitting portion are connected, a jet cavity is formed between the cover plate and the recessed portion; one side wall of the recessed portion has an air inlet, and a spray seam is formed between the other side of the recessed portion away from the air inlet and the cover plate, and the jet cavity is connected to the air inlet and the spray seam. The present invention can solve the technical problem of high cost and difficulty when the spray seam height is changed in the related art.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel test jet control, and in particular to a variable-slot-height steady-state air blowing flow control device and a processing method thereof. Background Art

[0002] At present, steady blowing in wind tunnel tests refers to continuously providing a jet with a constant speed and direction to the test object in the wind tunnel to simulate the flight or motion state of the object in a stable airflow. In the active flow control technology of aircraft, the jet control technology has great application prospects due to its stable input and significant flow control effect.

[0003] The basic principle of this technology is to inject momentum into the specific flow field around the aircraft through a narrow nozzle, and the steady jet interacts with the local flow, so as to suppress flow separation and improve the aerodynamic performance of the aircraft. This technology mainly includes boundary layer suction, boundary layer blowing, combined blowing and suction, etc. Numerical calculations and wind tunnel test studies based on the Common Research Model (CRM) show that the application of jet control technology can make the hinged simple flap achieve the aerodynamic performance of the traditional high-lift configuration. At present, the technical maturity of this technology is not high, and its engineering application and promotion process requires a large number of wind tunnel tests and flight verifications, and the nozzle height and its distribution are important research parameters of jet control technology.

[0004] In related technologies, wind tunnel tests need to consider changing the nozzle height to study the effect of its parameters. However, in practice, it is found that changing the nozzle height is both costly and difficult. Summary of the invention

[0005] The present application discloses a variable seam height constant blowing flow control device and a processing method, so as to solve the technical problems in the related art that the cost and difficulty are high when the spray seam height is changed.

[0006] In the first aspect, the present application provides a variable-height constant-blowing flow control device, which adopts the following technical solution:

[0007] A variable seam height constant blowing flow control device comprises: a base plate, the base plate comprises a recessed portion and a fitting portion, the recessed portion is concavely arranged, and the fitting portion is arranged at the top opening edge of the recessed portion; a cover plate, the number of cover plates is multiple, and the thicknesses of the multiple cover plates are different from each other, so that when it is necessary to change the height of the spray seam, it is only necessary to replace different cover plates to adjust the spray seams of different heights, one of the multiple cover plates is detachably connected to the fitting portion, and after the cover plate is connected to the fitting portion, a jet cavity is formed between the cover plate and the recessed portion; one side wall of the recessed portion has an air inlet, and a spray seam is formed between the other side of the recessed portion facing away from the air inlet and the cover plate, and the jet cavity is connected to both the air inlet and the spray seam.

[0008] Preferably, it also includes a fixing member, which is located in the spray gap and has two ends connected to the recessed portion and the cover plate respectively, and the fixing member is used to limit the position of the recessed portion and the cover plate when compressed gas is introduced into the spray gap.

[0009] Preferably, there are multiple fixing parts, which are distributed along the length direction of the spray seam; the fixing parts are arranged on the recessed part and the cover plate, the fixing part located on one of the recessed part and the cover plate has a first through hole, and the fixing part located on the other of the recessed part and the cover plate has a first threaded hole, and a first threaded rod is passed between the first through hole and the first threaded hole.

[0010] Preferably, one end of the first through hole away from the first threaded hole is expanded, and a sealing ring is embedded in the expanded portion of the first through hole.

[0011] Preferably, the fixing member includes a first fixing portion and a second fixing portion, and the second fixing portion is arranged on a side of the first fixing portion close to the spray outlet; the outer surface of the first fixing portion is cylindrical, and the second fixing portion is straight bar-shaped, and along the length direction of the spray, the width of the first fixing portion is greater than the width of the second fixing portion.

[0012] Preferably, the spray seam includes an arc seam segment and a straight seam segment connected along the jet moving direction, the arc seam segment is arc-shaped and smoothly connected to the jet cavity, and the straight seam segment is smoothly connected to the side of the arc seam segment away from the jet cavity and connected to the outside.

[0013] Preferably, the flow length of the arc slit segment is at least 1 to 3 times that of the straight slit segment, and the flow length of the straight slit segment is at least 2 to 6 times the height of the spray slit.

[0014] Preferably, one of the cover plate and the fitting portion has a plurality of second through holes, and the other has second threaded holes corresponding to the plurality of second through holes one by one, and a second threaded rod is provided between the second through holes and the second threaded holes.

[0015] Preferably, at least one of the fitting portion and the cover plate has a sealing groove, the extension direction of the sealing groove is consistent with the extension direction of the fitting portion, and a sealing strip is embedded in the sealing groove, and the sealing strip is used to seal the gap between the cover plate and the fitting portion.

[0016] In a second aspect, the present application provides a method for processing a variable-slit high-constant air blowing flow control device, which adopts the following technical solution:

[0017] A method for manufacturing a variable seam height constant air blowing flow control device, which is used to manufacture a variable seam height constant air blowing flow control device of the above technical solution, comprises the following steps:

[0018] The cover plate and the bottom plate are cut by the alloy tool, the alloy tool is fed during cutting, and a new alloy tool is replaced each time a cover plate or bottom plate is processed;

[0019] Heat treatment is performed at least twice on the cut cover plate or base plate;

[0020] During processing, the thickness of the cover plate near the spray seam is adjusted according to test requirements so that multiple cover plates have different thicknesses.

[0021] The present invention has the following advantages and beneficial effects:

[0022] During wind tunnel tests, compressed gas is generated by a pressure source and injected into the air inlet. The compressed gas forms a jet in the jet cavity and is ejected from the nozzle, thereby interacting with the specific flow field around the aircraft, ultimately achieving the effect of suppressing flow separation and improving the aerodynamic performance of the aircraft.

[0023] If it is necessary to study the effects of different spray gap heights and their distribution on the jet, the cover plate can be removed from the fitting portion on the base plate, replaced with a cover plate of different thickness and then reinstalled on the fitting portion, so that the height of the spray gap can be adaptively changed; that is, the cover plate can be pre-made into multiple different models to suit different spray gap heights.

[0024] After such arrangement, when the height of the spray seam needs to be changed, it is only necessary to replace different cover plates to adjust the spray seams of different heights. Compared with the prior art, the spray seams of the present application only need to replace different cover plates when changing the height, and the cost and difficulty of height adjustment are lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic diagram of the structure of some embodiments of the present application Figure 1 ;

[0027] Figure 2 yes Figure 1 Explosion diagram in ;

[0028] Figure 3 This is a schematic diagram of the structure of some embodiments of the present application Figure 2 ;

[0029] Figure 4 is a partial cross-sectional view of some embodiments of the present application;

[0030] Figure 5 yes Figure 4 A magnified view of part A in FIG.

[0031] Figure 6 yes Figure 2 A magnified view of part B in FIG.

[0032] Figure 7 is a schematic diagram of the structure of a cover plate for displaying some embodiments of the present application;

[0033] Figure 8 yes Figure 7 The enlarged view of the C part in FIG.

[0034] Fig. 9 yes Figure 4 The enlarged view of the D part in FIG.

[0035] Fig.10 It is a schematic structural diagram for showing that a sealing strip is arranged on a fitting portion in some embodiments of the present application.

[0036] The markings in the figure are:

[0037] 100, bottom plate; 110, recessed portion; 111, air inlet; 120, fitting portion; 200, cover plate; 300, spray seam; 310, arc seam section; 320, straight seam section; 400, fixing piece; 410, first fixing portion; 420, second fixing portion; 430, first through hole; 431, sealing ring; 500, first threaded hole; 510, first threaded rod; 600, second through hole; 700, second threaded hole; 710, second threaded rod; 800, sealing groove; 810, sealing strip; 900, jet cavity. DETAILED DESCRIPTION

[0038] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0039] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0040] In related technologies, wind tunnel testing is an important means of studying the aerodynamic characteristics of aircraft. Steady air blowing refers to injecting airflow of a certain speed and direction into certain parts of the test model in the wind tunnel to simulate the flight state of the aircraft under the control of steady air blowing. In recent years, active flow control technology for aircraft has gradually received attention, and the jet control technology has shown broad application prospects with its advantages such as significant flow control effect and stable input.

[0041] The basic principle of jet control technology is to inject momentum through the narrow nozzles around the aircraft. The jet interacts with the surrounding airflow to suppress flow separation and improve the aerodynamic performance of the aircraft. Common control methods include boundary layer suction, boundary layer blowing, and combined blowing and suction. Wind tunnel tests and numerical calculation studies based on general civil aircraft standard models have shown that the application of jet control technology can significantly improve aerodynamic performance, especially hinged simple flaps can achieve the effect of traditional high-lift configurations.

[0042] In wind tunnel tests, the height and distribution of the nozzles are important parameters that affect the jet control effect. By adjusting the nozzle height, the jet control effect on the airflow can be optimized. However, the applicant has found in practice that the cost and difficulty of changing the nozzle height are high, which is a key problem in the current engineering application of jet control technology, which is specifically reflected in the following situations:

[0043] 1. High cost: Changing the nozzle height usually involves mechanical adjustment or reconstruction of the nozzle structure, which requires physical modification of the aircraft model. Especially in wind tunnel tests, model modification not only requires precise manufacturing processes, but may also require recalibration of the entire test system, thereby increasing the material, labor and time costs of the test.

[0044] 2. High technical difficulty: The change of nozzle height is not just a simple mechanical adjustment, but also requires ensuring that the flow characteristics are not destroyed. This involves complex flow field simulation, re-verification of test data, and precise control of nozzle structure. At the same time, the change of nozzle height will affect the uniformity of the jet and the momentum injection effect, requiring extremely high engineering precision and technical support.

[0045] For example, in the wind tunnel test of jet control technology and the flight verification of scaled models, the height of the spray seam is generally taken as 0.2‰~0.6‰ of the characteristic chord length of the aircraft. Due to the small size of the scaled model, the spray seam used in the test will become very small. Even if the test is carried out in a larger wind tunnel of 4m~8m, the equivalent chord length of the aircraft is unlikely to exceed 1500mm, and the height of the spray seam is 1mm or even sub-millimeter, with an accuracy requirement of ±0.05mm. The difficulty and cost of processing such a narrow spray seam are high.

[0046] In the above scenario, if the test needs to consider changing the nozzle height to study the influence of its parameters, the cost and difficulty of the change will be higher. At the same time, how to change the nozzle height at low cost, conveniently and quickly while taking into account the sealing of the jet cavity, the rigidity of the nozzle structure and the nozzle height accuracy, there is currently no better solution.

[0047] In summary, the difficulties of jet control technology in wind tunnel testing are mainly reflected in the design and implementation of the spray seam of the jet device in the scaled model test. The most prominent feature of the jet device is that the length-to-width (height) ratio of the spray seam is very large, generally greater than 200:1, which leads to low stiffness of the spray seam and large relative deformation during processing. It is quite difficult to ensure the structural stiffness and dimensional accuracy of the spray seam while taking into account the sealing of the jet cavity. In addition, the spray seam height itself is a very important parameter of the jet control technology. How to change the spray seam height conveniently and quickly, improve test efficiency, and reduce test costs, puts forward more stringent requirements for its device design. Therefore, for the variable spray seam height jet device based on replacing the cover plate, it is necessary to comprehensively consider many aspects such as component design, processing technology, assembly, and airtightness.

[0048] In view of this, in the first aspect, some embodiments of the present application provide a variable-slot-height constant-blowing flow control device. The device comprises a bottom plate and a cover plate, the bottom plate and the cover plate are detachably connected, a jet cavity is formed between the bottom plate and the cover plate, and an air inlet is provided at one end of the jet cavity, and a spray slot is provided at the other end of the jet cavity, and the spray slot is formed by connecting the cover plate to the bottom plate. Therefore, the height of the spray slot can be changed by simply replacing a cover plate of a different model, which not only reduces the cost but also makes replacement easier.

[0049] See also Figures 1 to 10 In some embodiments, the variable seam height constant blowing flow control device includes a bottom plate 100 and a cover plate 200, wherein the bottom plate 100 includes a recessed portion 110 and a fitting portion 120, the recessed portion 110 is concavely arranged, and the fitting portion 120 is arranged at the top opening edge of the recessed portion 110. Exemplarily, the recessed portion 110 is concavely arranged to form a cavity, and the inner surface of the cavity is smoothly transitioned. In this way, when the compressed gas enters the cavity, the resistance encountered by the compressed gas will be smaller, thereby reducing the loss of the compressed gas entering the cavity.

[0050] At the same time, combined Figure 1 , Figure 2, the number of cover plates 200 is multiple, the thicknesses of the multiple cover plates 200 are different from each other, one of the multiple cover plates 200 is detachably connected to the fitting portion 120, and after the cover plate 200 is connected to the fitting portion 120, a jet cavity 900 is formed between the cover plate 200 and the recessed portion 110. Exemplarily, the surface width of the fitting portion 120 and the cover plate 200 is greater than the thickness of the recessed portion 110. The reason for such a setting is that after the cover plate 200 and the fitting portion 120 are fitted, the contact area between the cover plate 200 and the fitting portion 120 is increased to improve the fitting stability of the cover plate 200 and the fitting portion 120. In addition, after the cover plate 200 and the fitting portion 120 are fitted, the cavity in the recessed portion 110 is covered by the cover plate 200 to form a jet cavity 900.

[0051] Furthermore, refer to Figure 2-Figure 4 , one side wall of the recessed portion 110 has an air inlet 111, and a spray seam 300 is formed between the other side of the recessed portion 110 away from the air inlet 111 and the cover plate 200, and the jet cavity 900 is connected with the air inlet 111 and the spray seam 300. Exemplarily, the recessed portion 110 includes a bottom portion and a side portion, the three bottom edges of the bottom portion are vertically connected in sequence, the other bottom edge extends upward at an angle, and the side portion is vertically connected at the three bottom edges of the bottom portion to form three vertical side surfaces that are vertical in sequence, and the fitting portion 120 is extended to the top of the three vertical side surfaces. The air inlet 111 is opened on the middle vertical side surface among the three vertical side surfaces, the length direction of the air inlet 111 is consistent with the length direction of the middle vertical side surface, the height direction of the air inlet 111 is consistent with the height direction of the middle vertical side surface, and the shape of the air inlet 111 is a long strip. In this way, compressed gas can be more conveniently poured into the air inlet 111. It is worth noting that the compressed gas will form the jet in the present application when it reaches the spray gap.

[0052] Exemplarily, the shape of the spray seam 300 is also long strip, and the spray seam 300 and the air inlet 111 are opposite to each other on the moving path of the jet, so that the compressed gas can enter the jet cavity 900 through the air inlet 111 and then be ejected immediately through the spray seam 300, so as to reduce the energy loss of the jet and improve the ejection effect of the spray seam 300. Furthermore, the side of the cover plate 200 facing the jet cavity 900 is a plane, and the outer surface of the cover plate 200 facing away from the jet cavity 900 is the shell of the test model, so the plate edge of the cover plate 200 is also straight. In the recessed portion 110, a bottom edge of the recessed portion 110 extends obliquely upward to the straight plate edge close to the cover plate 200, and the edge of the bottom plate 100 of the recessed portion 110 is also straight. Therefore, a narrow spray seam 300 is formed by the plate edge of the cover plate 200 and the plate edge of the recessed portion 110 approaching each other. It is worth noting that the total area of ​​the air inlet 111 is greater than the total area of ​​the spray slot 300 .

[0053] On this basis, during the wind tunnel test, compressed gas is generated by the air source and blown toward the air inlet 111. The compressed gas forms a jet in the jet cavity 900 and is ejected from the nozzle 300, and then interacts with the specific flow field around the aircraft, and finally suppresses flow separation and improves the aerodynamic performance of the aircraft. If it is necessary to study the influence of different nozzle 300 heights and their distribution on the jet, the cover plate 200 can be removed from the fitting part 120 on the bottom plate 100, and the cover plate 200 of different thicknesses can be replaced and reinstalled on the fitting part 120, so that the height of the nozzle 300 can be adaptively changed; that is, the cover plate 200 can be pre-made into multiple different models to be suitable for different nozzle 300 heights. After such arrangement, when the height of the spray seam 300 needs to be changed, it is only necessary to replace different cover plates 200 to adjust the spray seam 300 of different heights. Compared with the prior art, when the height of the spray seam 300 of the present application needs to be changed, it is only necessary to replace different cover plates 200 to achieve adjustment, and the cost of height adjustment is lower and the difficulty is also lower.

[0054] In some embodiments, Figure 3 , Figure 4 As shown, it also includes a fixing member 400, which is located in the spray slot 300 and has two ends connected to the recessed portion 110 and the cover plate 200 respectively. The fixing member 400 is used to limit the positions of the recessed portion 110 and the cover plate 200 when the spray slot 300 passes through the jet.

[0055] Before setting the fixing part 400, since there is no support between the recessed portion 110 and the cover plate 200 and at the position of the spray seam 300, if compressed gas is injected into the air inlet 111, when the compressed gas reaches the spray seam 300 through the jet cavity 900, the edge of the cover plate 200 and the edge of the recessed portion 110 near the spray seam 300 are likely to be affected by the compressed gas and shifted, so that the height of the spray seam 300 changes in the process of spraying compressed gas, which makes it difficult to maintain a good stability of the height of the spray seam 300 under the current test state. Based on this, after the fixing member 400 is set between the recessed portion 110 and the cover plate 200, the fixing member 400 can effectively limit the distance between the cover plate 200 and the recessed portion 110 at the spray seam 300, so that the height of the spray seam 300 can maintain good stability when the compressed gas passes through, so as to improve the stability of the spray seam 300 during the current wind tunnel test to a certain extent, that is, the height of the spray seam 300 can always be maintained at the height required for the wind tunnel test, thereby ultimately improving the accuracy of the parameters of the wind tunnel test.

[0056] In some embodiments, Figure 4 , Figure 5As shown, there are multiple fixing members 400, and the fixing members 400 are distributed along the length direction of the spray seam 300; the fixing members 400 are arranged on the recessed portion 110 and the cover plate 200, and the fixing member 400 located on one of the recessed portion 110 and the cover plate 200 has a first through hole 430, and the fixing member 400 located on the other of the recessed portion 110 and the cover plate 200 is provided with a first threaded hole 500, and a first threaded rod 510 is inserted between the first through hole 430 and the first threaded hole 500.

[0057] Exemplarily, the fixing member 400 is arranged on the recessed portion 110, and a first through hole 430 is provided at a position corresponding to the fixing member 400 on the cover plate 200, a first threaded hole 500 is provided on the fixing member 400 along its own axial direction, and a first threaded rod 510 is inserted between the first through hole 430 and the first threaded hole 500; or, the fixing member 400 is arranged on the cover plate 200, and a first through hole 430 is provided at a position corresponding to the fixing member 400 on the recessed portion 110, a first threaded hole 500 is provided on the fixing member 400 along its own axial direction, and a first threaded rod 510 is inserted between the first through hole 430 and the first threaded hole 500; or, the fixing member 400 is provided with one on the cover plate 200 and the recessed portion 110 respectively, the fixing member 400 located on the cover plate 200 has a first through hole 430, and the fixing member 400 located on the recessed portion 110 has a first threaded hole 500, and a first threaded rod 510 is inserted between the first through hole 430 and the first threaded hole 500.

[0058] After such arrangement, when fixing the position of the recessed portion 110 and the cover plate 200 at the spray seam 300, the first through hole 430 is directly aligned with the first threaded hole 500, and then the first threaded rod 510 is directly inserted through the first through hole 430 until the first threaded rod 510 reaches the first threaded hole 500, and then the first threaded rod 510 is rotated so that the first threaded rod 510 is threadedly connected to the first threaded hole 500. At this time, the nut at the end of the first threaded rod 510 will be pressed against the wall outside the opening of the first through hole 430, thereby stably connecting the cover plate 200 and the bonding plate, and the connection is also more convenient. Similarly, when disassembling, the first threaded rod 510 can be removed from the first threaded hole 500 to achieve disassembly, so that the disassembly of the cover plate 200 and the bonding portion 120 is also more convenient. In this case, when compressed gas passes through the spray gap 300, the positions of the cover plate 200 and the recessed portion 110 at the spray gap 300 are not easily affected by the compressed gas and fluctuate, thereby improving the stability of the spray gap 300 when it is maintained at the current height.

[0059] In some embodiments, in combination Figure 5, the end of the first through hole 430 away from the first threaded hole 500 is expanded, and a sealing ring 431 is embedded in the expanded part of the first through hole 430. In this way, since the first through hole 430 and the first threaded hole 500 are provided at the position where the fixing member 400 is provided, after the fixing member 400 is installed in place, there is still a gap between the first through hole 430 and the first threaded hole 500, that is, the compressed gas moving in the jet cavity 900 is likely to flow to the outside through the gap between the first threaded rod 510 and the first through hole 430, thereby causing leakage of the compressed gas when it moves in the jet cavity 900. And since the leakage position is close to the spray seam 300, it is also likely that the compressed gas sprayed from the spray seam 300 cannot reach the preset parameter value in the wind tunnel test, thereby causing deviation in the wind tunnel test. It is worth noting that, in the wind tunnel test, the momentum of the compressed gas ejected from the nozzle 300 is a high-precision value, so it is necessary to ensure as much as possible that the compressed gas does not generate excessive momentum loss when ejected from the nozzle 300. Based on this, after the sealing ring 431 is embedded at the expanded opening of the first through hole 430, the leakage of the compressed gas at the first through hole 430 will be greatly reduced.

[0060] In some embodiments, reference Figure 2 , Figure 6 The fixing member 400 includes a first fixing portion 410 and a second fixing portion 420. The second fixing portion 420 is disposed on a side of the first fixing portion 410 close to the outlet of the spray slot 300. The outer surface of the first fixing portion 410 is cylindrical. Exemplarily, in other embodiments, the first fixing portion 410 may also be other smooth blunt-headed shapes, such as arc-shaped, streamlined, etc. The second fixing portion 420 is in a straight strip shape. Along the length direction of the spray slot 300, the width of the first fixing portion 410 is greater than the width of the second fixing portion 420.

[0061] After such arrangement, since the fixing member 400 is arranged in the spraying slot 300, the fixing member 400 will have a certain influence on the spraying of the compressed gas at the spraying slot 300. Based on this, considering the high stability of the spraying slot 300, the fixing member 400 is set as a first fixing part 410 and a second fixing part 420, and the outer surface of the first fixing part 410 is cylindrical, so when the compressed gas passes through the front of the first fixing part 410, the disturbance forced to be generated by the airflow will be greatly reduced, and the flow separation caused by sharp edges or sudden shape changes can also be avoided.

[0062] It is worth noting that flow separation refers to the situation that when the airflow moves along the surface of the fixing member 400, the airflow cannot adhere to the surface due to sudden shape changes or excessive surface roughness, forming eddies or turbulent areas. The cylindrical outer surface of the first fixing portion 410 can make the airflow adhere to the surface of the first fixing portion 410 smoothly, reduce the generation of separation areas, and thus reduce the jet non-uniformity caused by this.

[0063] Furthermore, the outer surface of the first fixing portion 410 is cylindrical, so that the compressed gas has a smooth transition at the first fixing portion 410, which can effectively reduce the turbulence of the jet, making it easier for the compressed gas to maintain a laminar state, thereby reducing friction resistance. When the compressed gas moves along the surface of the first fixing portion 410 to the second fixing portion 420, the second fixing portion 420 is a straight strip that can guide the compressed gas so that the compressed gas is ejected toward the open end of the spray seam 300. And the existence of the second fixing portion 420 will not affect the compressed gas too much, but can play a certain guiding role in the movement of the compressed gas. At the same time, the second fixing portion 420 can also increase the support strength of the fixing member 400 for the spray seam 300, further improving the structural stability at the spray seam 300.

[0064] In summary, based on cost and the effect of reducing jet non-uniformity, multiple fixing members 400 are arranged in the spray slot 300 to support the spray slot 300, and the shape of the first fixing member 400 and the second fixing member 400 can further reduce the interference with the compressed gas and improve the ejection effect of the compressed gas. This arrangement can not only improve the support stability of the spray slot 300, but also reduce the non-uniformity of the compressed gas ejected from the spray slot 300.

[0065] In some embodiments, reference Figure 7-Figure 8 The spray slot 300 includes an arc slot segment 310 and a straight slot segment 320 connected along the jet moving direction, the arc slot segment 310 is arc-shaped and smoothly connected to the jet cavity 900, and the straight slot segment 320 is smoothly connected to the side of the arc slot segment 310 away from the jet cavity 900 and connected to the outside. Exemplarily, the arc slot segment 310 and the straight slot segment 320 form a transition curved surface at the spray slot 300.

[0066] Through the above scheme, the design combining arcs and straight lines can reduce the processing difficulty brought by complex curved surfaces. Compared with completely irregular curved surfaces, the combination of transition arcs and straight lines is easier to use standard CNC processing equipment for cutting, grinding and other processes, thereby improving the accuracy and efficiency of processing. Secondly, the form of arc transition helps to smoothly connect different segments of curved surfaces or planes, avoiding the problem of excessive curvature changes, thereby reducing the accumulation of errors that may occur during the processing process. Furthermore, the transition surface provides a smoother air flow path, reduces unnecessary flow interference, and combined with the straight part, the width and shape of the spray seam 300 can be more accurately controlled to ensure the uniformity and stability of air flow. Finally, the combination of arcs and straight lines can more easily achieve repeatability in different processing batches, ensure the consistency of multiple spray seams 300, and facilitate mass production and quality control. In this way, the processing difficulty of the spray seam 300 can be greatly reduced.

[0067] In some embodiments, the flow direction length of the arc slit segment 310 is at least 1 to 3 times that of the straight slit segment 320, and the flow direction length of the straight slit segment 320 is at least 2 to 6 times the height of the spray slot 300. Exemplarily, the flow direction length of the arc slit segment 310 is 2 times that of the straight slit segment 320, and the flow direction length of the straight slit segment 320 is 4 times the height of the spray slot 300. Exemplarily, the flow direction length refers to the length in the direction of airflow movement.

[0068] The advantages of such a configuration are: 1. The longer arc gap segment 310 enables the airflow to smoothly transition when passing through the spray gap 300, thereby reducing flow separation. By providing a longer curve transition zone, the sudden change of the airflow can be effectively reduced, the probability of flow separation can be reduced, and the stability of the jet can be improved; 2. The longer straight slot section 320 helps to stabilize the shape of the jet, ensuring that the airflow in the nozzle 300 area remains parallel and evenly distributed, and the straight part provides a sufficient development length for the airflow, ensuring that the initial directionality of the jet is relatively stable, avoiding separation or deviation in the early stage of injection; 3. The arc slot section 310 can effectively guide the airflow into the nozzle area of ​​the nozzle 300, while the straight slot section 320 ensures the stability of the jet at the outlet, reduces jet turbulence, and thus improves the airflow control effect in the entire wind tunnel test; 4. The setting of the straight slot section 320 and the longer arc slot section 310 can help the airflow gradually adapt to shape changes and avoid pressure loss caused by sudden shape changes. Such a design can effectively reduce the energy loss of the airflow at the nozzle and ensure the accuracy in the wind tunnel test; 5. Setting a fixed length ratio is conducive to the standardization of wind tunnel design and manufacturing. The standard length ratio not only facilitates processing and manufacturing, but also enables wind tunnel tests under different conditions to maintain consistency, enhancing the controllability and repeatability of the test results.

[0069] In some embodiments, in combination Figure 4 , Fig. 9 , one of the cover plate 200 and the fitting part 120 has a plurality of second through holes 600, and the other has a second threaded hole 700 corresponding to the plurality of second through holes 600, and a second threaded rod 710 is provided between the second through holes 600 and the second threaded hole 700. Exemplarily, the size of the plate surface of the cover plate 200 is adapted to the size of the cross section surrounded by the fitting part 120, so that the cover plate 200 and the fitting part 120 can be better fitted. For example, the second threaded hole 700 is opened on the fitting part 120, and the second through hole 600 is opened on the cover plate 200, and the second through hole 600 passes through the cover plate 200.

[0070] With such a configuration, when the cover plate 200 is connected to the fitting portion 120, the second through hole 600 is aligned with the second threaded hole 700, and then the second threaded rod 710 is inserted from the second through hole 600 until the second threaded rod 710 reaches the second threaded hole 700, and then the second threaded rod 710 is rotated so that the second threaded rod 710 is threadedly connected to the second threaded hole 700. At this time, the nut at the end of the second threaded rod 710 will be pressed against the wall outside the opening of the second through hole 600, thereby stably connecting the cover plate 200 to the fitting plate, and the connection is also more convenient. Similarly, when disassembling, the second threaded rod 710 can be removed from the second threaded hole 700 to achieve disassembly, so that the disassembly of the cover plate 200 and the fitting portion 120 is also more convenient.

[0071] In some embodiments, reference Fig. 9 , Fig.10 At least one of the bonding portion 120 and the cover plate 200 has a sealing groove 800, the extension direction of the sealing groove 800 is consistent with the extension direction of the bonding portion 120, and a sealing strip 810 is embedded in the sealing groove 800, which is used to seal the gap between the cover plate 200 and the bonding portion 120.

[0072] Exemplarily, the sealing groove 800 is located on the side of the second threaded rod 710 close to the jet cavity 900; or, the sealing groove 800 is located on the side of the second threaded rod 710 away from the jet cavity 900; or, the extension path of the sealing groove 800 is staggered with the plurality of second threaded rods 710. Exemplarily, the depth of the sealing groove 800 is less than the thickness of the sealing strip 810, so that after the sealing strip 810 is embedded in the sealing groove 800, part of the sealing strip 810 is exposed outside the sealing groove 800, which facilitates the extrusion of the part of the sealing strip 810 exposed outside the sealing groove 800 after the cover plate 200 and the fitting part 120 are connected by the second threaded rod 710, so that the sealing strip 810 has a better sealing effect on the gap between the cover plate 200 and the fitting part 120.

[0073] Please refer to Figures 1 to 10 In a second aspect, some embodiments of the present application further provide a method for processing a variable seam height constant blowing flow control device, which is used to manufacture the variable seam height constant blowing flow control device mentioned in any of the above schemes, comprising the following steps:

[0074] The cover plate 200 and the base plate 100 are cut by an alloy tool, and the alloy tool is fed during cutting to reduce the extrusion stress generated during the processing. A new alloy tool is replaced every time a cover plate 200 or a base plate 100 is processed to reduce the possible deformation of the parts after processing. Exemplarily, the alloy tool is fed at a high speed and a small amount during cutting. For example, for the cover plate 200 and the base plate 100 made of 30CrMnSiA material, during rough milling, high speed refers to a given speed of 2000rpm~3000rpm, and a small amount of feed refers to a feed amount of 0.2mm / r~0.3mm / r; during fine milling, high speed refers to a given speed of 3500rpm~5000rpm, and a small amount of feed refers to a feed amount of 0.05mm / r~0.1mm / r;

[0075] The cut cover plate 200 or base plate 100 is heat treated at least twice. The first heat treatment is to temper the material to increase the hardness and remove the cutting stress generated by rough milling. The second heat treatment is to further remove the cutting stress generated during the machining process.

[0076] During processing, the thickness of the cover plate 200 near the spray seam 300 is adjusted according to test requirements, so that the plurality of cover plates 200 have different thicknesses.

[0077] Through the above processing method, the processed cover plate 200 and the bottom plate 100 can have higher structural strength and be more suitable for transmitting compressed gas in wind tunnel tests. In addition, through the above processing method, a systematic processing mode can be formed, that is, multiple cover plates 200 of different thicknesses can be repeatedly processed, and the processing efficiency of the cover plate 200 can also be improved. After processing, with the detachable connection between the cover plate 200 and the bottom plate 100, the cover plates 200 of different thicknesses can be replaced to form spray seams 300 of different heights, and the production cost is also lower.

[0078] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A variable seam height constant blowing flow control device, characterized in that: include: A bottom plate (100), the bottom plate (100) comprising a recessed portion (110) and a fitting portion (120), the recessed portion (110) being arranged inwardly concavely, and the fitting portion (120) being arranged at a top opening edge of the recessed portion (110); A cover plate (200), wherein the number of the cover plates (200) is plural, and the thicknesses of the cover plates (200) are different from each other, so that when the height of the spraying slot (300) needs to be changed, the spraying slot (300) of different heights can be adjusted by simply replacing a different cover plate (200), and one of the cover plates (200) is detachably connected to the fitting portion (120), and after the cover plate (200) is connected to the fitting portion (120), a jet cavity (900) is formed between the cover plate (200) and the recessed portion (110); One side wall of the recessed portion (110) has an air inlet (111), a spray seam (300) is formed between the other side of the recessed portion (110) away from the air inlet (111) and the cover plate (200), and the jet cavity (900) is in communication with both the air inlet (111) and the spray seam (300).

2. A variable seam height constant blowing flow control device according to claim 1, characterized in that: It also includes a fixing member (400), the fixing member (400) being located in the spray seam (300) and having two ends respectively connected to the recessed portion (110) and the cover plate (200), the fixing member (400) being used to limit the positions of the recessed portion (110) and the cover plate (200) when compressed gas is introduced into the spray seam (300).

3. A variable seam height constant blowing flow control device according to claim 2, characterized in that: There are a plurality of fixing members (400), and the fixing members (400) are distributed along the length direction of the spraying seam (300); The fixing member (400) is arranged on the recessed portion (110) and the cover plate (200); the fixing member (400) located on one of the recessed portion (110) and the cover plate (200) has a first through hole (430); the fixing member (400) located on the other of the recessed portion (110) and the cover plate (200) has a first threaded hole (500); and a first threaded rod (510) is provided between the first through hole (430) and the first threaded hole (500).

4. A variable seam height constant blowing flow control device according to claim 3, characterized in that: One end of the first through hole (430) away from the first threaded hole (500) is expanded, and a sealing ring (431) is embedded in the expanded portion of the first through hole (430).

5. The variable seam height constant blowing flow control device according to claim 2 is characterized in that: The fixing member (400) comprises a first fixing portion (410) and a second fixing portion (420), wherein the second fixing portion (420) is arranged on a side of the first fixing portion (410) close to an outlet of the spray slot (300); The outer surface of the first fixing portion (410) is cylindrical, the second fixing portion (420) is straight-strip shaped, and along the length direction of the spray seam (300), the width of the first fixing portion (410) is greater than the width of the second fixing portion (420).

6. The variable seam height constant blowing flow control device according to claim 1 is characterized in that: The spray seam (300) comprises an arc seam section (310) and a straight seam section (320) which are connected along the direction of jet movement; the arc seam section (310) is arc-shaped and smoothly connected to the jet cavity (900); the straight seam section (320) is smoothly connected to the side of the arc seam section (310) facing away from the jet cavity (900) and connected to the outside.

7. A variable seam height constant blowing flow control device according to claim 6, characterized in that: The flow direction length of the arc slit section (310) is at least 1 to 3 times that of the straight slit section (320), and the flow direction length of the straight slit section (320) is at least 2 to 6 times the height of the spray slit (300).

8. The variable seam height constant blowing flow control device according to claim 1 is characterized in that: One of the cover plate (200) and the fitting portion (120) has a plurality of second through holes (600), and the other has second threaded holes (700) corresponding one-to-one to the plurality of second through holes (600), and a second threaded rod (710) is provided between the second through holes (600) and the second threaded holes (700).

9. A variable seam height constant blowing flow control device according to claim 8, characterized in that: At least one of the bonding portion (120) and the cover plate (200) has a sealing groove (800), the extension direction of the sealing groove (800) is consistent with the extension direction of the bonding portion (120), and a sealing strip (810) is embedded in the sealing groove (800), and the sealing strip (810) is used to seal the gap between the cover plate (200) and the bonding portion (120).

10. A method for manufacturing a variable seam height constant air blowing flow control device, used for manufacturing the variable seam height constant air blowing flow control device according to any one of claims 1 to 9, characterized in that: The following steps are involved: The cover plate (200) and the bottom plate (100) are cut by an alloy tool, the alloy tool is fed during cutting, and a new alloy tool is replaced each time a cover plate (200) or a bottom plate (100) is processed; The cut cover plate (200) or base plate (100) is subjected to heat treatment at least twice; During processing, the thickness of the cover plate (200) near the spray seam (300) is adjusted according to test requirements, so that the plurality of cover plates (200) have different thicknesses.

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