Movable wind tunnel test device and debugging method thereof

Abstract

The invention relates to the technical field of wind tunnel tests, in particular to a movable wind tunnel test device and a debugging method thereof. The movable wind tunnel test device comprises an upper structure, a lower structure and a test model, wherein the upper structure and the lower structure are symmetrically arranged at a wind hole; the test model is fixed between the upper structure and the lower structure; each of the upper structure and the lower structure comprises a fixed longitudinal beam fixedly connected to the wind hole; the movable cross beams are lapped on the fixed longitudinal beams; the longitudinal pulley trolley can slide along the fixed longitudinal beam; the longitudinal limiter is used for limiting the longitudinal pulley trolley; the height adjusting device is arranged on the movable cross beam; and the model fixing device is fixed on the height adjusting device and is used for fixing the test model. The movable wind tunnel test device can rapidly move and accurately and repeatedly position.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel testing technology, and in particular to a mobile wind tunnel testing device and its debugging method. Background Technology

[0002] In wind tunnel testing, it is often necessary to move, adjust, and re-secure the test model at different locations within the wind tunnel. After installation and fixation, the test model forms a structural unit with its supporting structure, resulting in a large mass. If the testing method involves dismantling and reinstalling the model, it requires a large number of personnel, and the operation steps are cumbersome and complex, consuming a significant amount of manpower and testing time. If the model is moved as a whole, additional mechanisms that match the supporting structure need to be designed, and the new position needs to be determined during the movement, which may lead to insufficient positioning and installation accuracy.

[0003] For example, when conducting wind tunnel tests on bridge segment models, the influence of the boundary layer wind field necessitates adjusting the position of the bridge segment model within the wind field to meet testing requirements. A certain level of accuracy is required for the positioning of the bridge segment model before and after movement, and repeated testing at the same location is necessary even after changes to the aerodynamic shape of the bridge segment model. Furthermore, the bridge segment model is subjected to significant wind loads during testing, necessitating the secure fixing of the supporting structure inside the wind tunnel. Summary of the Invention

[0004] The problem this invention aims to solve is to provide a mobile wind tunnel testing device for large-mass models that can be moved quickly and accurately and repeatedly positioned, as well as its debugging method, in order to address the above-mentioned shortcomings.

[0005] The technical solution proposed in this invention is: a movable wind tunnel testing device, comprising an upper structure and a lower structure symmetrically arranged at the wind tunnel entrance, and a test model fixed between the upper and lower structures, wherein both the upper and lower structures include: A fixed longitudinal beam that is fixedly connected to the wind tunnel entrance; A movable crossbeam that overlaps a fixed longitudinal beam; A longitudinal pulley that can slide along a fixed longitudinal beam and a longitudinal limiter for limiting the movement of the longitudinal pulley; The height adjustment device is installed on the movable crossbeam; The model fixing device is fixed on the height adjustment device and is used to fix the test model.

[0006] In one embodiment, the fixed longitudinal beam is fixedly connected to the inner wall of the wind tunnel by welding or bolts, and the installation direction of the fixed longitudinal beam is parallel to the length of the wind tunnel and the direction of the incoming airflow.

[0007] In one embodiment, a slidable transverse pulley and a transverse limiter for limiting the transverse pulley are installed inside the movable crossbeam, and one end of the height adjustment device is fixed to the transverse pulley.

[0008] In one embodiment, both the longitudinal pulley cart and the transverse pulley cart include a mounting section and a wheel section connected to the mounting section.

[0009] In one embodiment, the longitudinal limiter is engaged in the fixed longitudinal beam, and the transverse limiter is engaged in the movable crossbeam. Both the longitudinal limiter and the transverse limiter are provided with a nut.

[0010] In one embodiment, both the fixed longitudinal beam and the movable crossbeam are provided with scales for positioning adjustment.

[0011] In one embodiment, the movable crossbeam is installed and fixed perpendicularly to the fixed longitudinal beam.

[0012] In one embodiment, the height adjustment device is fixedly connected to the transverse pulley carriage by welding or bolts.

[0013] In one embodiment, a laser positioning sensor is also included, which is mounted on a fixed longitudinal beam or a movable crossbeam.

[0014] Based on the same inventive concept, a debugging method for the aforementioned movable wind tunnel testing device is also provided, comprising: The dimensions and lengths of the fixed longitudinal beam and the movable transverse beam are determined based on the requirements of the wind tunnel test and the dimensions of the test model. The designed test model is installed on the model fixing device, and the test model is adjusted to be in the center of the wind tunnel using the height adjustment device; Conduct wind tunnel tests; After the wind tunnel test is completed, the lateral and longitudinal limiters are opened; the position of the test model is adjusted by sliding the lateral and longitudinal pulleys; then the upper and lower structures are aligned by the laser positioning sensor to achieve the positioning of the test model, and the wind tunnel test is carried out again. Repeat the previous step until all test conditions are completed.

[0015] Compared with existing technologies, the advantages of this invention are as follows: The aforementioned movable wind tunnel testing device comprises an upper structure, a lower structure, and a test model fixed between the upper and lower structures, symmetrically arranged at the wind tunnel entrance, forming an integrated structure. This eliminates the need for repeated disassembly and assembly of large-mass test models, enabling rapid adjustment to the required position within the wind tunnel testing section, saving manpower and time. The upper and lower structures of this application are simple in composition, convenient and quick to construct and install, and can be completed in a very short time, making it highly practical. The upper and lower structures, relying on the combination of longitudinal and transverse beams, can withstand extremely high wind loads, firmly fixing the test model inside the wind tunnel and providing sufficient lateral support, ensuring structural safety and stability. The test model is moved in multiple directions using a pulley trolley, and after each movement, it is repositioned and fixed for the next working condition test, making the process convenient and quick. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an overall schematic diagram of a wind tunnel testing apparatus according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a wind tunnel testing device according to an embodiment of the present invention; Figure 3 This is a partial enlarged view of a wind tunnel testing apparatus according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a longitudinal pulley cart structure according to an embodiment of the present invention.

[0018] In the attached figures, the following labels are used: 1. Upper structure; 2. Lower structure; 3. Wind tunnel; 4. Test model; 11. Fixed longitudinal beam; 12. Moving crossbeam; 13. Longitudinal pulley; 131. Pulley section; 132. Mounting section; 14. Longitudinal limiter; 15. Laser positioning sensor; 16. Height adjustment device; 17. Model fixing device. Detailed Implementation

[0019] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0020] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0021] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0022] Please see Figure 1-4 One embodiment of the mobile wind tunnel testing device includes an upper structure 1 and a lower structure 2 symmetrically arranged at the wind tunnel entrance, and a test model 4 fixed between the upper and lower structures. Both the upper structure 1 and the lower structure 2 include: a fixed longitudinal beam 11 fixedly connected to the wind tunnel entrance; a movable crossbeam 12 overlapping the fixed longitudinal beam 11; a longitudinal pulley 13 slidable along the fixed longitudinal beam 11; and a longitudinal limiter 14 for limiting the movement of the longitudinal pulley 13. A height adjustment device 16 is disposed on the movable crossbeam 12; and a model fixing device 17 is fixed to the height adjustment device 16 for fixing the test model 4. Rapid movement and precise repeatable positioning of the test model 4 at various locations inside the wind tunnel can be achieved with minimal human intervention.

[0023] Specifically, in one embodiment, the fixed longitudinal beam 11 is fixed to the inner wall of the wind tunnel 3 by welding or bolting. The installation direction of the fixed longitudinal beam 11 is parallel to the length of the wind tunnel and the direction of the incoming airflow. Since the beam cross-sectional size of the fixed longitudinal beam 11 is very small relative to the cross-section of the wind tunnel, this installation method can ensure the quality of the flow field inside the wind tunnel to the greatest extent.

[0024] Specifically, in one embodiment, a slidable transverse pulley and a transverse limiter for limiting the transverse pulley are installed inside the movable crossbeam 12, and one end of the height adjustment device 16 is fixed to the transverse pulley. Preferably, in one embodiment, the movable crossbeam 12 is installed and fixed perpendicularly to the fixed longitudinal beam 11.

[0025] Specifically, in one embodiment, the longitudinal pulley 13 and the transverse pulley have the same structure, both including a mounting part 132 and a wheel part 131 connected to the mounting part 132. Multiple longitudinal pulleys 13 and transverse pulleys are correspondingly installed in the fixed longitudinal beam 11 and the movable crossbeam 12, and multiple longitudinal limiters 14 and transverse limiters are provided. Specifically, on the fixed longitudinal beam 11, the wheel part 131 of the longitudinal pulley 13 is engaged in the inner rail of the fixed longitudinal beam 11, allowing the entire movable crossbeam 12 to move smoothly back and forth on the fixed longitudinal beam 11. The movable crossbeam 12 is fixedly connected to the mounting part 132 of the longitudinal pulley 13, preferably by welding or bolting. In the movable crossbeam 12, the wheel part of the transverse pulley is engaged in the inner rail of the movable crossbeam 12, and the mounting part of the transverse pulley is fixedly connected to the height adjustment device 16, preferably by welding or bolting. The test model 4 can move smoothly back and forth on the fixed longitudinal beam 11 by moving the transverse pulley trolley back and forth on the inner rail of the moving crossbeam 12, thus enabling the test model 4 to move back, forth, left and right at the wind tunnel test opening.

[0026] Preferably, in one embodiment, both the fixed longitudinal beam 11 and the movable crossbeam 12 are provided with a certain precision scale, which can be used for precise positioning, adjustment and alignment.

[0027] Preferably, in one embodiment, the height adjustment device 16 includes a plurality of telescopic rods for adjusting to a suitable height. In this embodiment, the model fixing device 17 is the boundary part of the entire upper structure 1 or lower structure 2, and is securely connected to the test model 4. It can be smoothly moved left and right on the moving crossbeam 12 as a whole by means of the longitudinal pulley 13.

[0028] Specifically, in one embodiment, the model fixing device 17 has a slot in the center, and the test model 4 is fixed in the slot.

[0029] Preferably, in one embodiment, a laser positioning sensor 15 is installed on the fixed longitudinal beam 11 or the movable crossbeam 12. This sensor is used for positioning after each movement to ensure that the upper structure 1 and the lower structure 2 are vertically aligned, which is convenient and quick.

[0030] Embodiments of the present invention provide a debugging method for a convenient mobile and precise positioning wind tunnel testing device, which, using the above-mentioned positioning wind tunnel testing device, includes the following steps: S10. Determine the dimensions and lengths of the fixed longitudinal beam 11 and the movable cross beam 12 according to the requirements of the wind tunnel test and the dimensions of the test model 4. Specifically, in one embodiment, the unit load-bearing force of the fixed longitudinal beam 11 and the movable crossbeam 12 is 1000 N / m, and the overall mass of the test model 4 is 90 kg. Considering the distance the beam needs to move during the experiment, the fixed longitudinal beam 11 is designed to be 14 m long, and the movable crossbeam 12 is designed to be 10 m long, which meets the structural load-bearing requirements.

[0031] S20. Install the test model 4 with the designed dimensions on the model fixing device 17, and adjust the test model 4 to be in the center of the wind tunnel using the height adjustment device 16. Specifically, the fixed longitudinal beam 11, the movable cross beam 12, all the pulleys and limiters are assembled in sequence. Subsequently, the height adjustment device 16, the model fixing device 17 and the laser positioning sensor 15 are installed on the upper structure 1 and the lower structure 2.

[0032] In this embodiment, the wind tunnel is 3.5m high and the model is 3m long. The height of the upper structure 1 and the lower structure 2 is adjusted to 0.5m using the height adjustment device 16, so that the test model 4 is in the center of the wind tunnel.

[0033] S30. Conduct wind tunnel tests; S40. After the wind tunnel test is completed, the lateral limiter and longitudinal limiter 14 are opened; the position of the test model 4 is adjusted by sliding the lateral pulley and longitudinal pulley 13; then the upper and lower structures are aligned by the laser positioning sensor 15 to achieve the positioning of the test model, and the wind tunnel test is carried out again.

[0034] S50. Repeat the previous step until all test conditions are completed.

[0035] The aforementioned mobile wind tunnel testing device constructs a fixed support structure using a combination of fixed longitudinal beams and movable transverse beams. The installation direction of the fixed longitudinal beams is parallel to the incoming flow direction, and their cross-sectional dimensions are relatively small compared to the cross-section of the wind tunnel. This minimizes the interference of the support structure itself on the core flow field within the wind tunnel, ensuring the accuracy and reliability of the experimental aerodynamic data and meeting the core design requirements of wind tunnel testing devices. A height adjustment device ensures that test models of different sizes can be precisely placed at the center of the wind tunnel, obtaining accurate aerodynamic data (especially symmetrical data), enhancing the device's versatility. Combined with a pulley system to move the test model, longitudinal and transverse limiters ensure stable fixation after positioning, preventing model displacement during testing. After initial positioning, precise positioning using a laser positioning sensor successfully solves the problems of difficult model movement, low positioning accuracy, low efficiency, and significant flow field interference in traditional wind tunnel testing. This device and method, while ensuring the quality of the wind tunnel flow field and the accuracy of experimental data, achieves rapid, convenient movement and precise, repeatable positioning of test models, significantly improving the efficiency and flexibility of wind tunnel testing, and possessing high practical value and promising prospects for widespread application.

[0036] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A moveable wind tunnel test device, characterized by, The movable wind tunnel test device comprises an upper structure and a lower structure symmetrically arranged at a wind tunnel opening, and a test model fixed between the upper structure and the lower structure, wherein the upper structure and the lower structure each comprise: a fixed longitudinal beam fixedly connected to the wind tunnel opening; a movable cross beam lapped on the fixed longitudinal beam; a longitudinal trolley slidable along the fixed longitudinal beam and a longitudinal limiter for limiting the longitudinal trolley; a height adjusting device arranged on the movable cross beam; a model fixing device fixed on the height adjusting device for fixing the test model.

2. The moveable wind tunnel test device of claim 1, wherein, The fixed longitudinal beam is fixedly connected to the inner wall of the wind tunnel by welding or bolts, and the installation direction of the fixed longitudinal beam is parallel to the length of the wind tunnel and the flow direction of the wind.

3. The moveable wind tunnel test device of claim 1, wherein, The movable cross beam is internally provided with a slidable transverse trolley and a transverse limiter for limiting the transverse trolley, and one end of the height adjusting device is fixed on the transverse trolley.

4. The moveable wind tunnel test device of claim 3, wherein, The longitudinal trolley and the transverse trolley each comprise an installation portion and a wheel portion connected to the installation portion.

5. The moveable wind tunnel test device of claim 3, wherein, The longitudinal limiter is clamped in the fixed longitudinal beam, the transverse limiter is clamped in the movable cross beam, and a female screw is arranged on the longitudinal limiter and the transverse limiter.

6. The moveable wind tunnel test device of claim 1, wherein, The fixed longitudinal beam and the movable cross beam are each provided with a scale for positioning and adjusting.

7. The moveable wind tunnel test device of claim 1, wherein, The movable cross beam is perpendicularly fixed to the fixed longitudinal beam.

8. The moveable wind tunnel test device of claim 3, wherein, The height adjusting device is fixedly connected to the transverse trolley by welding or bolts.

9. The moveable wind tunnel test device of claim 1, wherein, The movable wind tunnel test device further comprises a laser positioning sensor arranged on the fixed longitudinal beam or the movable cross beam.

10. A debugging method of the movable wind tunnel test device according to any one of claims 1-9, comprising: determining the size and length of the fixed longitudinal beam and the movable cross beam according to the requirements of the wind tunnel test and the size of the test model; installing the test model of the designed size on the model fixing device, and adjusting the test model to the center of the wind tunnel through the height adjusting device; performing the wind tunnel test; after the wind tunnel test is completed, opening the transverse limiter and the longitudinal limiter, adjusting the position of the test model through the sliding of the transverse trolley and the longitudinal trolley, and completing the alignment of the upper structure and the lower structure through the laser positioning sensor to realize the positioning of the test model, and then performing the wind tunnel test again; repeating the above steps until all test working conditions are completed.

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