Wind tunnel experiment device and wind tunnel experiment equipment

Abstract

The invention discloses a wind tunnel experiment device and wind tunnel experiment equipment, and relates to the technical field of wind tunnel experiment devices.The wind tunnel experiment device comprises an extension cylinder sliding at the end of an experiment cylinder; an inner conical section is arranged at one end, located in the extension cylinder, of the experiment cylinder, a conveying gas hole used for outputting gas is formed in the inner conical section, a ring box is installed in the extension cylinder, and a suction hole facing the inner conical section is formed in the ring box; a fixed pipe communicated with the conveying air hole is installed on the outer wall of the experiment cylinder, a telescopic pipe slides on the fixed pipe, and the extension cylinder is provided with a sliding way for the telescopic pipe to penetrate through in a sliding mode. According to the wind tunnel experiment device and the wind tunnel experiment equipment, by arranging the structures such as the conveying air holes and the suction holes, an annular air curtain is formed, the friction loss of experiment airflow on the telescopic matching surface of the experiment cylinder and the extension cylinder is reduced, meanwhile, the main airflow at a connector can be straightened, flow field disturbance generated by structural gaps is weakened, and the experiment efficiency is improved. And the uniformity and stability of the flow field of the experiment section are further improved.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel testing equipment technology, and particularly to a wind tunnel testing device and wind tunnel testing equipment. Background Technology

[0002] Electric vehicles need to undergo wind tunnel testing, and this is just as necessary as for traditional gasoline vehicles. The core reason is that wind tunnel testing can solve the four major pain points of electric vehicles: range, energy consumption, noise, and stability. It is an indispensable key testing link before mass production.

[0003] In existing wind tunnel designs, the axial length of the exhaust section is mostly a fixed value, making it difficult to simultaneously adapt to the experimental needs of electric vehicles of different lengths (short, medium, and long). If a long exhaust section design is adopted to meet the needs of long-sized electric vehicle experiments, it will lead to excessively high equipment energy consumption and low space utilization during short-sized electric vehicle experiments. If a short exhaust section design is adopted to meet the needs of short-sized electric vehicles, it will be unable to meet the requirements of long-sized electric vehicles for wake development and flow field stability, thus affecting the accuracy of experimental data.

[0004] Therefore, it is necessary to propose a wind tunnel experimental device and wind tunnel experimental equipment to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a wind tunnel experimental apparatus and equipment to address the problem that in existing wind tunnel designs, the axial length of the exhaust section is often a fixed value, making it difficult to simultaneously adapt to the experimental needs of electric vehicles of different lengths (short, medium, and long). If a long exhaust section design is adopted to meet the needs of long-sized electric vehicle experiments, it will lead to excessively high energy consumption and low space utilization during short-sized electric vehicle experiments; conversely, if a short exhaust section design is adopted to suit short-sized electric vehicles, it cannot meet the requirements of long-sized electric vehicles for wake development and flow field stability, thus affecting the accuracy of experimental data.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a wind tunnel experimental device, comprising an extension tube that slides at the end of an experimental tube; The experimental tube has an inner conical section at one end inside the extension tube, and a gas delivery port for outputting gas is located at the inner conical section. An annular box is installed inside the extension tube, and the annular box has a suction port facing the inner conical section. A fixed tube connected to the air delivery port is installed on the outer wall of the experimental tube. A telescopic tube slides on the fixed tube, and the extension tube has a slide for the telescopic tube to slide through. A gas supply tube connected to the telescopic tube is provided at the end of the experimental tube away from the extension tube. During wind tunnel experiments, gas is output through the delivery vent, forming an annular air curtain with the same inner diameter as the extension tube between the inner cone section and the annular box; at the same time, the telescopic tube closes, the gas pushes the telescopic tube to move away from the experimental tube, and locks the extension tube.

[0007] Preferably, the experimental tube has a conveying ring cavity inside its wall, which is connected to the gas conveying pipeline of the factory. The conveying air hole is connected to the fixed pipe through the conveying ring cavity, and multiple conveying air holes and suction holes are provided.

[0008] Preferably, the slide includes a narrow section and a wide section. The narrow section is located on the outer wall of the extension cylinder, and the wide section is located on the inner wall of the extension cylinder. The narrow section and the wide section are connected. The width of the narrow section is smaller than the width of the wide section, and the telescopic tube is attached to the inner wall of the narrow section.

[0009] Preferably, a fixed ring is fixed on the telescopic tube, the fixed ring is slidably disposed inside the wide passage, a limiting block is fixedly connected to the side of the fixed ring facing away from the experimental tube, and multiple inner holes are provided on the inner wall of the wide passage for the limiting block to be inserted.

[0010] Preferably, a through groove is formed in the wall of the experimental cylinder, an elastic block is fixedly installed inside the through groove, the gas supply pipe is installed on the elastic block, the gas supply pipe is inclined, and the end near the inner cavity of the experimental cylinder is inclined towards the extension cylinder, and the gas supply pipe is connected to the telescopic pipe through the connecting pipe.

[0011] Preferably, the outside of the experimental cylinder is provided with an adjustment assembly for adjusting the tilt angle of the gas supply pipe. The adjustment assembly includes a bracket and a first electric push rod. The bracket is fixed on the outer wall of the experimental cylinder, the middle section of the gas supply pipe is rotatably mounted on the bracket, the fixed end of the first electric push rod is hinged to the outer wall of the experimental cylinder, and the telescopic end of the first electric push rod is hinged to the gas supply pipe.

[0012] Preferably, a solenoid valve is fixedly installed on the telescopic tube.

[0013] Preferably, a third electric push rod is fixedly installed at the bottom of the experimental tube, and a placement plate is provided inside the experimental tube, which is fixedly installed on the telescopic end of the third electric push rod.

[0014] Preferably, a fan is fixedly installed inside the experimental tube, and the fan is close to the extension tube.

[0015] The present invention also discloses a wind tunnel experimental device, which uses the wind tunnel experimental device described above.

[0016] The technical effects and advantages of this invention are as follows: This invention, by setting up an experimental tube and an extension tube, allows the length of the air outlet section to be flexibly switched according to the size characteristics and flow field requirements of the experimental vehicle, achieving efficient compatibility of experiments on electric vehicles and railway vehicles of different lengths. This ensures the experimental accuracy of various vehicle types while avoiding energy waste caused by fixed-length designs. This invention forms an annular air curtain by setting up structures such as conveying air holes and suction holes, which reduces the friction loss of the experimental airflow at the expansion and contraction mating surfaces of the experimental cylinder and the extension cylinder. At the same time, it can also "straighten" the main airflow at the interface, weaken the flow field disturbance caused by structural gaps, and further improve the uniformity and stability of the flow field in the experimental section. The present invention sets an inner cone section, changing the original "stepped groove" to an "inclined, smooth transition" structure, which fundamentally reduces airflow separation and vortex caused by geometric abrupt changes, and makes the airflow at the interface smoother. This invention achieves the function of replenishing air by setting up a gas replenishment pipe and adjusting components, maintaining stable airflow pressure in the experimental section, avoiding deviation of the experimental flow rate from the preset value due to insufficient pressure, and flexibly adjusting the tilt angle to meet various needs. This invention, by setting up structures such as telescopic tubes, fixed rings, and solenoid valves, prevents the extension tube from rotating on the experimental tube and serves as a guide. At the same time, during the experiment, the extension tube cannot slide on the experimental tube, reducing the pressure of the second electric push rod and ensuring the stability of the annular air curtain and other devices. The system includes fixed and telescopic pipes, which serve functions such as gas delivery, guiding and limiting, and locking. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the wind tunnel experimental device of the present invention.

[0018] Figure 2 For the present invention Figure 1 Enlarged schematic diagram of the structure at point A in the middle.

[0019] Figure 3 For the present invention Figure 1 Enlarged schematic diagram of the structure at point B.

[0020] Figure 4 This is a cross-sectional structural diagram of the wind tunnel experimental device of the present invention.

[0021] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point C.

[0022] Figure 6 For the present invention Figure 4 Enlarged schematic diagram of the structure at point D.

[0023] Figure 7 For the present invention Figure 4 Enlarged schematic diagram of the structure at point E in the middle.

[0024] Figure 8 This is a schematic diagram of the extension cylinder and fan structure of the present invention.

[0025] Figure 9 For the present invention Figure 8Enlarged schematic diagram of the structure at point F.

[0026] Figure 10 This is a schematic diagram of the extension cylinder structure of the present invention.

[0027] Figure 11 For the present invention Figure 10 Enlarged schematic diagram of the structure at point G.

[0028] Figure 12 This is a schematic diagram of the telescopic tube and solenoid valve structure of the present invention.

[0029] In the diagram: 1. Experimental tube; 101. Inner conical section; 102. Conveying ring cavity; 103. Conveying air hole; 2. Extension tube; 3. Ring box; 301. Suction hole; 4. Slide; 401. Narrow section; 402. Wide section; 403. Inner hole; 5. Fixed tube; 6. Telescopic tube; 601. Fixed ring; 602. Limiting block; 7. Spring; 8. Solenoid valve; 9. Connecting tube; 10. Through groove; 11. Elastic block; 12. Air supply tube; 13. Support; 14. First electric push rod; 15. Wind speed sensor; 16. Fan; 17. Second electric push rod; 18. Third electric push rod; 19. Placement plate; 20. Placement groove; 21. Cover plate. Detailed Implementation

[0030] This invention provides, for example Figures 1-12 The wind tunnel test apparatus shown is particularly suitable for wind tunnel testing of electric vehicles, railway vehicles, etc. It includes a test cylinder 1, which is fixedly installed on a test bench in the factory. An extension cylinder 2 is slidably provided at one end of the test cylinder 1. A rubber pad is installed on the outer wall of the part of the test cylinder 1 and the extension cylinder 2 that slides together to reduce wear and ensure sealing.

[0031] The experimental tube 1 is provided with a second electric push rod 17 on its outside. The fixed end of the second electric push rod 17 is installed on the experimental tube 1, and the telescopic end of the second electric push rod 17 is installed on the extension tube 2. The movement of the extension tube 2 is controlled by the second electric push rod 17.

[0032] A fan 16 is fixedly installed inside the experimental tube 1, and the fan 16 is close to the extension tube 2. The fan 16 includes a motor, a fan and other structures. When the fan 16 is running, it generates an airflow from the experimental tube 1 toward the extension tube 2.

[0033] A third electric push rod 18 is fixedly installed at the bottom of the experimental cylinder 1. The third electric push rod 18 is located on the side of the fan 16 facing away from the extension cylinder 2. A placement plate 19 is provided inside the experimental cylinder 1. The placement plate 19 is fixedly installed on the telescopic end of the third electric push rod 18. In actual use, a clamping device (not shown in the figure) is provided on the placement plate 19 to fix the vehicle model. The clamping device includes anti-slip clamps, elastic pressure blocks and other structures, which can be adapted to the fastening requirements of vehicle models of different sizes. The clamping device is a common existing technology and will not be described in detail here. The height position of the experimental vehicle is adjusted by the third electric push rod 18. In addition, a placement groove 20 and a cover plate 21 are provided on the side wall of the experimental cylinder 1 to facilitate the experimental personnel to put in and take out the model.

[0034] The end of the experimental tube 1 furthest from the extension tube 2 is designated as the air inlet section, the placement plate 19 is designated as the experimental section, and the side of the fan 16 facing away from the placement plate 19 is designated as the air outlet section.

[0035] Considering that the axial length of the exhaust section in existing wind tunnel designs is mostly a fixed value, adopting a long exhaust section design to meet the needs of long-sized electric vehicle experiments would lead to excessive energy consumption and low space utilization during short-sized electric vehicle experiments. Conversely, adopting a short exhaust section design adapted to short-sized electric vehicles would fail to meet the requirements of long-sized electric vehicles for wake development and flow field stability, thus affecting the accuracy of experimental data. This design is not only difficult to adapt to the same type (e.g., electric vehicles of different lengths) but also incompatible with the experimental needs of multiple types of vehicles, such as electric vehicles and railway vehicles. To improve the efficiency of the wind tunnel experimental device, this invention provides an extension tube 2 that is slidably installed at one end of the experimental tube 1, allowing for flexible adjustment of the exhaust section length. Specifically: When testing small electric vehicles (such as micro electric cars and small electric SUVs), the extension tube 2 maintains the minimum extension. At this time, the total length of the air outlet section is adjusted to twice the diameter of the main body section of the test tube 1 to ensure that the local wake of the small electric vehicle can be discharged quickly, avoid redundant stagnation of airflow in the pipe, reduce the operating energy consumption of the fan 16, and improve the utilization rate of site space. When conducting experiments on medium-sized electric vehicles (such as compact electric sedans and mid-sized electric SUVs), the extension tube 2 is controlled to extend to a medium length so that the total length of the air outlet section is 2.2 to 2.5 times the diameter of the main body section of the experimental tube 1. This adapts to the wake diffusion range, balances the flow field stability and energy consumption requirements, and ensures the measurement accuracy of aerodynamic drag and lift data. When conducting experiments on large electric vehicles (such as large electric commercial vehicles and extended electric SUVs), the drive extension tube 2 extends further, increasing the total length of the air outlet section to 2.5 to 3 times the diameter of the main body section of the experimental tube 1. This fully accommodates the development and dissipation of its long-distance wake, avoids the accumulation of wake to form turbulence interference, and ensures the uniformity of the flow field corresponding to the wide-body vehicle. When conducting experiments on railway vehicles, the control extension tube 2 is fully extended to its maximum stroke to adapt to the flow field envelopment requirements of the long body structure of the railway vehicle, providing sufficient diffusion space for its tail drag vortex, while weakening the complex disturbances generated by the wake interaction in multi-car train experiments, and ensuring the accuracy of experimental data in scenarios such as tunnel coupling and multi-car intersection.

[0036] In summary, by setting up the experimental tube 1 and the extension tube 2, the length of the air outlet section can be flexibly switched according to the size characteristics and flow field requirements of the experimental vehicle, so as to achieve efficient compatibility of experiments on electric vehicles and railway vehicles of different lengths. This ensures the experimental accuracy of various vehicle types and avoids the energy waste and space idleness caused by fixed length design.

[0037] Furthermore, to achieve noise reduction and overall structural stability, the walls of both the experimental tube 1 and the extension tube 2 are made thicker. However, there is a physical step at the interface between the experimental tube 1 and the extension tube 2, and the inner diameter of the extension tube 2 increases. The airflow is prone to separation and vortex in this area, which disrupts the uniformity of the flow field. To ensure airflow stability, an inner cone section 101 is provided at one end of the experimental tube 1 inside the extension tube 2. The inner diameter of the inner cone section 101 gradually increases from the experimental tube 1 toward the extension tube 2, changing the original "stepped groove" to an "inclined, smooth transition" structure. This reduces airflow separation and vortex caused by geometric abrupt changes at the source, making the airflow at the interface smoother.

[0038] Meanwhile, a gas delivery port 103 for outputting gas is provided at the inner conical section 101. Multiple gas delivery ports 103 are provided and are evenly distributed around the axis of the inner conical section 101. A delivery annular cavity 102 is provided inside the wall of the experimental cylinder 1. The multiple gas delivery ports 103 are all connected to the delivery annular cavity 102. The delivery annular cavity 102 is connected to the high-pressure gas delivery pipeline of the factory through a connecting pipe. A high-precision pressure regulating valve and a flow sensor are installed on the connecting pipe, which can adjust the gas pressure and flow rate entering the delivery annular cavity 102 in real time to achieve uniform gas distribution.

[0039] During processing, the conveying ring cavity 102 is formed by "grooving the wall, welding the end face sealing plate, and polishing". The sealing plate is sealed to the wall of the experimental cylinder 1 by argon arc welding to prevent gas leakage.

[0040] An annular box 3 is installed inside the extension tube 2. The annular box 3 is located at the end of the extension tube 2 away from the experimental tube 1. The annular box 3 has suction holes 301 facing the inner cone section 101. Multiple suction holes 301 are provided and are evenly distributed around the axis of the annular box 3. The annular box 3 is connected to the gas suction pipe of the factory through a guide pipe. It is equipped with a variable frequency vacuum pump and pressure transmitter, etc., which can adjust the suction intensity according to the pressure requirements of the annular gas curtain to form a stable airflow circulation.

[0041] Specifically, gas is output through the conveying vent 103 and drawn in through the suction vent 301, forming an annular air curtain with the same inner diameter as the extension cylinder 2 between the inner cone section 101 and the annular box 3. This annular air curtain forms a continuous air-floating lubrication layer, reducing the frictional loss of the experimental airflow at the expansion and contraction mating surfaces of the experimental cylinder 1 and the extension cylinder 2. At the same time, the uniform airflow of the air curtain can also "straighten" the main airflow at the interface, weakening the flow field disturbance caused by the structural gap, and further improving the uniformity and stability of the flow field in the experimental section.

[0042] Furthermore, the velocity of the annular air curtain is controlled within the range of 1.1 to 1.5 times that of the main airflow velocity. This achieves both sealing and lubrication functions through the velocity difference, while avoiding excessive interference with the main airflow, thus ensuring the uniformity and stability of the flow field in the experimental section.

[0043] In summary, by setting up structures such as the conveying air hole 103 and the suction hole 301, the present invention forms an annular air curtain, which reduces the frictional loss of the experimental airflow at the expansion and contraction mating surface of the experimental cylinder 1 and the extension cylinder 2. At the same time, it can also "straighten" the main airflow at the interface, weaken the flow field disturbance caused by the structural gap, and further improve the uniformity and stability of the flow field in the experimental section.

[0044] Considering that the experimental airflow is easily blocked by the vehicle model or the pressure decreases due to friction of the experimental cylinder 1 during the experiment, a fixed pipe 5 connected to the delivery air hole 103 is installed on the outer wall of the experimental cylinder 1. The fixed pipe 5 is connected to the delivery ring cavity 102. Multiple fixed pipes 5 are provided and are evenly distributed around the axis of the experimental cylinder 1. A telescopic pipe 6 slides on the fixed pipe 5, and the extension cylinder 2 has a slide 4 for the telescopic pipe 6 to slide through.

[0045] A guide groove, guide block or other structure (not shown in the figure) can be provided between the fixed pipe 5 and the telescopic pipe 6 to prevent the telescopic pipe 6 from rotating on the fixed pipe 5.

[0046] A spring 7 is fitted onto the fixed tube 5. One end of the spring 7 is fixedly connected to the telescopic tube 6, and the other end of the spring 7 is fixedly connected to the outer wall of the experimental tube 1. The spring 7 is set up to assist the telescopic tube 6 in resetting.

[0047] The fixed tube 5 and the telescopic tube 6 are made of stainless steel, which has high strength, and a sealing ring and other structures are set between them to ensure airtightness.

[0048] A through groove 10 is provided through the wall of the experimental cylinder 1, and the through groove 10 is located at the end of the experimental cylinder 1 away from the extension cylinder 2. Multiple through grooves 10 are distributed one-to-one with multiple fixed tubes 5. An elastic block 11 is fixedly installed inside the through groove 10. The elastic block 11 is made of rubber and can deform, while ensuring the sealing of the through groove 10. An air supply pipe 12 is installed on the elastic block 11. The air supply pipe 12 is inclined, and the end near the inner cavity of the experimental cylinder 1 is inclined towards the extension cylinder 2. A connecting pipe 9 is connected to the air supply pipe 12. The end of the connecting pipe 9 away from the air supply pipe 12 is connected to the corresponding telescopic pipe 6.

[0049] The connecting pipe 9 is made of telescopic material, which does not affect the angle adjustment of the air supply pipe 12. In actual use, a support frame is provided to support the connecting pipe 9 to ensure the stability of use.

[0050] A solenoid valve 8 is fixedly installed on the telescopic pipe 6 to control the connection status of the telescopic pipe 6.

[0051] Meanwhile, an adjustment assembly for adjusting the tilt angle of the gas supply pipe 12 is provided on the outside of the experimental cylinder 1. The adjustment assembly includes a bracket 13 and a first electric push rod 14. The bracket 13 is fixed on the outer wall of the experimental cylinder 1. The middle section of the gas supply pipe 12 is rotatably mounted on the bracket 13. The fixed end of the first electric push rod 14 is hinged to the outer wall of the experimental cylinder 1, and the telescopic end of the first electric push rod 14 is hinged to the gas supply pipe 12. The first electric push rod 14 drives the gas supply pipe 12 to rotate around the joint between it and the bracket 13 through telescopic movement, thereby adjusting the gas supply angle.

[0052] Specifically, during the experiment, when the experimental airflow experiences pressure attenuation due to model obstruction or pipe friction, the solenoid valve 8 is opened, and the gas supply pipe 12 can quickly deliver high-pressure gas to directly replenish the experimental airflow in the inner cavity of the experimental cylinder 1, maintaining the stable airflow pressure in the experimental section and preventing the experimental flow rate from deviating from the preset value due to insufficient pressure.

[0053] Meanwhile, the design of tilting towards the extension tube 2 ensures that the direction of the supplementary airflow and the experimental airflow are coordinated, preventing reverse impact and ensuring smooth integration of the supplementary airflow and experimental airflow, thus avoiding local airflow turbulence.

[0054] To meet the experimental needs of different vehicle lengths, the air supply pipe 12 can be adjusted by adjusting the tilt angle (the angle between the axis of the air supply pipe 12 and the radial section of the experimental cylinder 1): for small electric vehicles, a smaller tilt angle is used to concentrate the airflow in the middle of the experimental section; for large electric vehicles or railway vehicles, a larger tilt angle is used to expand the air supply coverage area, adapt to the large area requirements of the long-body model for airflow, and ensure that the experimental airflow flows uniformly along the surface of the model.

[0055] In addition, a wind speed sensor 15 is installed inside the experimental cylinder 1 and located at the experimental section. Multiple wind speed sensors 15 are provided, and multiple wind speed sensors 15 are distributed one-to-one with multiple fixed pipes 5. Specifically, a PLC controller can be set to connect between the wind speed sensor 15 and the solenoid valve 8. When any wind speed sensor 15 detects that the wind speed is lower than the set threshold, it transmits this information to the controller. The controller accurately controls the opening of the corresponding group of solenoid valves according to the flow rate attenuation area to achieve directional air replenishment. The controller and its control principle are common existing technologies and will not be described in detail here.

[0056] The wind speed sensor 15 is a five-hole probe type wind speed sensor. When installed in the experimental section, it can monitor the wind speed changes in different areas in real time with almost no impact on the internal flow field of the pipe.

[0057] In summary, this invention achieves the function of replenishing air by setting up the air replenishment pipe 12, adjusting components and other structures, maintaining the airflow pressure in the experimental section, avoiding the experimental flow rate from deviating from the preset value due to insufficient pressure, and flexibly adjusting the tilt angle to meet various needs.

[0058] Considering that the experimental airflow and the annular air curtain will exert a force on the extension tube 2 in the direction away from the experimental tube 1, which will pull the extension end of the second electric push rod 17, in order to reduce the pressure of the second electric push rod 17, the slide 4 includes a narrow section 401 and a wide section 402. The narrow section 401 is located on the outer wall of the extension tube 2, and the wide section 402 is located on the inner wall of the extension tube 2. The narrow section 401 and the wide section 402 are connected. The width of the narrow section 401 is smaller than the width of the wide section 402. The telescopic tube 6 is attached to the inner wall of the narrow section 401.

[0059] Meanwhile, a fixed ring 601 is fixed on the telescopic tube 6. The fixed ring 601 is slidably disposed inside the wide passage 402. A limiting block 602 is fixedly connected to the side of the fixed ring 601 facing away from the experimental tube 1. An inner hole 403 is provided on the inner wall of the wide passage 402 for the limiting block 602 to be inserted, and multiple inner holes 403 are provided.

[0060] Since the telescopic tube 6 is attached to the inner wall of the narrow passage 401, and the fixed ring 601 is slidably disposed inside the wide passage 402, the extension tube 2 cannot rotate on the experimental tube 1 and plays a guiding role, ensuring that the extension tube 2 slides stably on the experimental tube 1.

[0061] In actual use, ball bearings or similar components can be installed on the telescopic tube 6 and the fixed ring 601 to reduce friction with the slide rail 4.

[0062] When the solenoid valve 8 is closed, the gas enters the interior of the telescopic tube 6 through the delivery ring cavity 102 and the fixed tube 5, pushing the telescopic tube 6 to move away from the experimental tube 1 on the fixed tube 5. At this time, the limiting block 602 is inserted into the corresponding inner hole 403, and the extension tube 2 cannot slide on the experimental tube 1.

[0063] In actual use, multiple sets of solenoid valves 8 and telescopic tubes 6 are installed to ensure that at least one solenoid valve 8 is in the closed state.

[0064] After use, the control system opens the solenoid valve 8, the gas in the telescopic tube 6 is depressurized, and under the elastic restoring force of the spring 7, the telescopic tube 6 drives the fixed ring 601 and the limiting block 602 to move towards the experimental tube 1. The limiting block 602 is dislodged from the inner hole 403, the extension tube 2 is unlocked, and can be reset or adjusted in length.

[0065] In summary, by setting up structures such as the telescopic tube 6, the fixed ring 601, and the solenoid valve 8, the present invention prevents the extension tube 2 from rotating on the experimental tube 1 and serves as a guide. At the same time, during the experiment, the extension tube 2 cannot slide on the experimental tube 1, reducing the pressure of the second electric push rod 17 and ensuring the stability of the use of the annular air curtain, etc.

[0066] The fixed pipe 5 and the telescopic pipe 6 are installed to serve the functions of gas delivery, guiding and limiting, and locking.

[0067] The fan 16, the first electric actuator 14, the second electric actuator 17, the third electric actuator 18, and the solenoid valve 8, among other electrical components, are all connected to the factory power supply. The cable laying path avoids airflow disturbance areas and mechanical moving parts to prevent wear and leakage. All electrical components are uniformly managed by control switches or automatic control systems. The automatic control system is based on a PLC (Programmable Logic Controller), equipped with a 10-inch touch-screen human-machine interface (HMI) and a remote monitoring unit, which can realize functions such as parameter setting, status monitoring, and fault alarm. The manual / automatic control mode can be flexibly switched according to the specific use.

[0068] The present invention also discloses a wind tunnel testing device, which is used to conduct wind tunnel tests on electric vehicles, railway vehicles and the like.

Claims

1. A wind tunnel experimental apparatus, characterized in that, Includes an extension tube (2) that slides at the end of the experimental tube (1); The experimental tube (1) has an inner cone section (101) at one end inside the extension tube (2). The inner cone section (101) has a gas delivery port (103) for outputting gas. The extension tube (2) has an annular box (3) installed inside. The annular box (3) has a suction port (301) facing the inner cone section (101). A fixed tube (5) connected to the air delivery hole (103) is installed on the outer wall of the experimental tube (1). A telescopic tube (6) slides on the fixed tube (5), and the extension tube (2) has a slide (4) for the telescopic tube (6) to slide through. A gas supply tube (12) connected to the telescopic tube (6) is provided at the end of the experimental tube (1) away from the extension tube (2). During the wind tunnel experiment, gas is output from the air delivery port (103) to form an annular air curtain with the same inner diameter as the extension tube (2) between the inner cone section (101) and the ring box (3); at the same time, the telescopic tube (6) is closed, and the gas pushes the telescopic tube (6) to move away from the experimental tube (1) and locks the extension tube (2).

2. The wind tunnel experimental apparatus according to claim 1, characterized in that, The experimental tube (1) has a conveying ring cavity (102) inside its wall. The conveying ring cavity (102) is connected to the gas conveying pipeline of the factory. The conveying air hole (103) is connected to the fixed pipe (5) through the conveying ring cavity (102). Multiple conveying air holes (103) and suction holes (301) are provided.

3. The wind tunnel experimental apparatus according to claim 1, characterized in that, The slide (4) includes a narrow section (401) and a wide section (402). The narrow section (401) is located on the outer wall of the extension cylinder (2), and the wide section (402) is located on the inner wall of the extension cylinder (2). The narrow section (401) and the wide section (402) are connected. The width of the narrow section (401) is smaller than the width of the wide section (402). The telescopic tube (6) is attached to the inner wall of the narrow section (401).

4. The wind tunnel experimental apparatus according to claim 3, characterized in that, A fixed ring (601) is fixed on the telescopic tube (6). The fixed ring (601) is slidably disposed inside the wide passage (402). A limiting block (602) is fixedly connected to the side of the fixed ring (601) facing away from the experimental tube (1). An inner hole (403) for the limiting block (602) to be inserted is provided on the inner wall of the wide passage (402), and multiple inner holes (403) are provided.

5. The wind tunnel experimental apparatus according to claim 1, characterized in that, The experimental tube (1) has a through groove (10) through the wall. An elastic block (11) is fixedly installed inside the through groove (10). The gas supply pipe (12) is installed on the elastic block (11). The gas supply pipe (12) is inclined and one end near the inner cavity of the experimental tube (1) is inclined towards the extension tube (2). The gas supply pipe (12) is connected to the telescopic pipe (6) through the connecting pipe (9).

6. The wind tunnel experimental apparatus according to claim 5, characterized in that, The experimental cylinder (1) is provided with an adjustment assembly for adjusting the tilt angle of the gas supply pipe (12). The adjustment assembly includes a bracket (13) and a first electric push rod (14). The bracket (13) is fixed on the outer wall of the experimental cylinder (1). The middle section of the gas supply pipe (12) is rotatably mounted on the bracket (13). The fixed end of the first electric push rod (14) is hinged to the outer wall of the experimental cylinder (1), and the telescopic end of the first electric push rod (14) is hinged to the gas supply pipe (12).

7. The wind tunnel experimental apparatus according to claim 1, characterized in that, A solenoid valve (8) is fixedly installed on the telescopic tube (6).

8. The wind tunnel experimental apparatus according to claim 1, characterized in that, The bottom end of the experimental tube (1) is fixedly installed with a third electric push rod (18), and a placement plate (19) is provided inside the experimental tube (1). The placement plate (19) is fixedly installed on the telescopic end of the third electric push rod (18).

9. A wind tunnel experimental apparatus according to claim 1, characterized in that, A fan (16) is fixedly installed inside the experimental tube (1), and the fan (16) is close to the extension tube (2).

10. A wind tunnel experimental device, characterized in that, Use the wind tunnel experimental apparatus as described in claims 1 to 9.

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