Rotating body angle of attack adjustable water tunnel test device

Abstract

The application relates to a water tunnel test device with adjustable attack angle of a rotary body, which comprises the rotary body, a supporting assembly comprising a vertical supporting part and a horizontal supporting part, a driving assembly, a water tunnel comprising a first side wall, the first side wall being provided with a mounting hole, the length direction of the mounting hole being parallel to the horizontal radial direction of the circumferential motion track formed by the rotary body when the attack angle is adjusted, a first sealing part being provided with a first through hole, the rotary body and the vertical supporting part being located in the water tunnel, the driving assembly being located outside the water tunnel, the horizontal supporting part being sealingly connected to the vertical supporting part in sequence through the mounting hole and the first through hole, the axis of the horizontal supporting part being perpendicular to the first side wall, and the first sealing part being used to seal the assembly joint between the inner wall of the first side wall and the horizontal supporting part. The water tunnel test device can simply and conveniently adjust the attack angle of the rotary body in the water tunnel, meanwhile, the sealing performance of the water tunnel can be ensured, and the influence of the adjustment of the attack angle of the rotary body on the blocking effect in the water tunnel is reduced.

Description

Technical Field

[0001] This invention relates to the field of water tunnel testing equipment, and in particular to a water tunnel testing device with an adjustable angle of attack of a rotating body. Background Technology

[0002] Underwater vehicles include submarines and underwater weapons. They are generally rotating in shape and have advantages in stealth and maneuverability. They are an important component of the nation's major strategic deterrence forces. Strengthening the research on the hydrodynamics of underwater vehicles is of great importance.

[0003] Prototype testing of underwater vehicles is too costly, and many data points are difficult to measure accurately. Therefore, model tests need to be conducted in a laboratory. These tests typically require stable and controllable flow field conditions, so rotating body models are generally used in water tunnels. When a vehicle moves in the actual ocean, its direction of motion cannot be perfectly parallel to the incoming flow direction; there is an angle of attack. Therefore, water tunnel tests also need to simulate the angle of attack of the rotating body. Existing water tunnel testing equipment cannot directly adjust the angle of attack of the rotating body, requiring the fabrication of multiple models with different angles of attack, which is very costly. Moreover, adjusting the angle of attack of the rotating body inside a water tunnel presents a sealing problem. Summary of the Invention

[0004] Based on the aforementioned deficiencies in the prior art, the purpose of this invention is to provide a water tunnel testing device with adjustable angle of attack of the rotating body, which can easily and conveniently adjust the angle of attack of the rotating body inside the water tunnel, while ensuring the sealing of the inside and outside of the water tunnel and reducing the impact of adjusting the angle of attack of the rotating body on the blocking effect inside the water tunnel.

[0005] Therefore, the present invention provides the following technical solution.

[0006] This invention provides a water tunnel testing device with adjustable angle of attack of a rotating body, comprising:

[0007] A rotating body, used to simulate an underwater vehicle;

[0008] A support assembly, comprising a vertical support member and a horizontal support member, wherein the top end of the vertical support member is sealed to the bottom end of the rotating body;

[0009] A drive assembly, the drive end of which is coaxially connected to the transverse support member;

[0010] The water tunnel includes a first sidewall; the first sidewall is provided with an elongated mounting hole, the length direction of which is parallel to the horizontal radial direction of the circular motion trajectory formed by the rotating body when adjusting the angle of attack;

[0011] The first sealing element has a first through hole opposite to the position of the mounting hole;

[0012] The rotating body and the vertical support are located inside the water tunnel, and the drive assembly is located outside the water tunnel. The horizontal support passes through the mounting hole and the first through hole in sequence and is then sealed to the vertical support. The axis of the horizontal support is perpendicular to the first side wall. The first seal is used to seal the assembly gap between the inner wall of the first side wall and the horizontal support.

[0013] When adjusting the angle of attack, the drive assembly drives the support assembly to rotate the rotating body, and adjusts the position of the transverse support through the mounting hole to adjust the angle of attack and ensure that the center point of the rotating body is always located at the center of the horizontal cross section of the water tunnel.

[0014] Preferably, the axis of the rotating body coincides with the axis of the vertical support, and the axis of the vertical support is perpendicular to the axis of the horizontal support.

[0015] Preferably, both the vertical support and the horizontal support are tubular structures, and the support assembly is connected to the chamber inside the rotating body.

[0016] Preferably, the water tunnel test device includes a first connector, the outlines of both sides of its longitudinal section are the outlines of the NACA0040 airfoil, and its head is provided with a concave portion.

[0017] The connection between the vertical support and the horizontal support is partially rotatably located within the recess.

[0018] Preferably, the water tunnel testing device includes a second connector with a longitudinal section of NACA0040 airfoil and a second through hole; the two sides of the second connector abut against the surface wall of the first sealing member and the side wall of the first connector, respectively, and the surface of the first connector facing away from the second connector is curved.

[0019] The second through hole communicates with the first through hole and the recessed portion, respectively, so that the transverse support can rotatably pass through.

[0020] Preferably, the support assembly further includes a bent pipe connector for connecting the vertical support and the horizontal support;

[0021] The bend connector includes a vertical pipe section, a spherical connecting section, and a horizontal pipe section in sequence, with the spherical connecting section and the horizontal pipe section located tangentially within the concave portion.

[0022] Preferably, the inner wall of the first sidewall is provided with a groove, the mounting hole is located in the groove, and the first seal is embedded in the groove.

[0023] Preferably, it further includes a second seal, which and the first seal are distributed sequentially along the horizontal radial direction, and the second seal abuts against one side wall of the first seal; the sealing structure formed by the first seal and the second seal is engaged with the groove.

[0024] Preferably, the groove is provided with an annular groove, which surrounds the mounting hole and is used to engage the annular sealing ring.

[0025] Preferably, the outer periphery of the transverse support is fitted with a step seal ring and a fixing ring;

[0026] The Step seal ring is used to seal the assembly gap between the transverse support and the wall of the first through hole, and the fixing ring is interference-fitted into the first through hole and pressed against the outside of the Step seal ring.

[0027] The present invention has the following technical effects:

[0028] This invention provides a water tunnel testing device with adjustable angle of attack for a rotating body. It allows for simple and convenient adjustment of the angle of attack of the rotating body within the water tunnel, eliminating the need for multiple water tunnel testing models and saving material costs. Simultaneously, it ensures the water tunnel's airtightness, with a simple and convenient sealing operation. Furthermore, it ensures that the center point of the rotating body is always located at the center of the horizontal cross-section of the water tunnel, thereby reducing the blocking effect caused by adjusting the angle of attack. Attached Figure Description

[0029] Figure 1 This is a partial structural side view of the water tunnel testing apparatus of the present invention;

[0030] Figure 2 This is a three-dimensional structural diagram of the first sidewall of the present invention. Figure 1 ;

[0031] Figure 3 This is a rear view of the water tunnel test apparatus of the present invention when the rotating body is in its initial position;

[0032] Figure 4 This is a rear view of the water tunnel testing apparatus of the present invention after adjusting the angle of attack of the rotating body;

[0033] Figure 5 This is a three-dimensional structural schematic diagram of the first sealing element of the present invention;

[0034] Figure 6 This is a rear view of a partial assembly structure of the first sidewall, the first seal, the second seal, and the transverse support of the present invention.

[0035] Figure 7 This is a partial structural cross-sectional view of the water tunnel testing apparatus of the present invention;

[0036] Figure 8 This is a three-dimensional structural schematic diagram of the first connecting member of the present invention;

[0037] Figure 9 This is a three-dimensional structural diagram of the second connector of the present invention;

[0038] Figure 10 This is a three-dimensional structural diagram of the pipe bending connector of the present invention;

[0039] Figure 11 This is a front view of the pipe bend connector of the present invention;

[0040] Figure 12 This is a schematic diagram of the assembly structure of the bend connector and the first connecting member of the present invention;

[0041] Figure 13 This is a partial sectional view of the assembly structure of the first sidewall and the transverse support member of the present invention;

[0042] Figure 14 This is a three-dimensional structural diagram of the fixing ring of the present invention;

[0043] Figure 15 This is a three-dimensional structural schematic diagram of the first half-connector of the present invention;

[0044] Figure 16 This is a three-dimensional structural schematic diagram of the second half connector of the present invention;

[0045] Figure 17 This is a three-dimensional structural diagram of the bearing bush of the present invention;

[0046] Figure 18 This is a three-dimensional structural diagram of the transverse support member of the present invention;

[0047] Figure 19 This is a three-dimensional structural diagram of the first sidewall of the present invention. Figure 2 .

[0048] Explanation of reference numerals in the attached figures

[0049] 100. Water tunnel testing apparatus;

[0050] 1. Rotating body; 11. Cavity;

[0051] 2. Support components; 21. Vertical support; 211. First channel; 22. Horizontal support; 221. Second channel; 222. Keyway; 223. Through hole; 23. Bend connector; 231. Vertical pipe section; 232. Spherical connecting section; 233. Horizontal pipe section;

[0052] 3. Drive components; 31. Worm gear reducer; 32. Universal coupling;

[0053] 4. First sidewall; 41. Mounting hole; 42. Groove; 421. Annular groove; 43. Recess;

[0054] 51. First sealing element; 511. First through hole; 52. Second sealing element;

[0055] 61. First connecting part; 611. Recessed portion;

[0056] 62. Second connecting piece; 621. Second through hole;

[0057] 71. Step seal ring; 72. Retaining ring; 721. Threaded hole;

[0058] 81. First half-connector; 811. First semi-circular groove; 82. Second half-connector; 821. Mounting plate; 822. Half-block; 8221. Second semi-circular groove; 823. Reinforcing rib; 83. Bearing bush. Detailed Implementation

[0059] To make the technical solution and beneficial effects of the present invention more apparent and understandable, a detailed description is provided below by listing specific embodiments. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0060] In the description of this invention, unless otherwise expressly defined, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this invention and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limiting this invention.

[0061] In this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" can explicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two; "several" means at least one; unless otherwise expressly defined.

[0062] In this invention, unless otherwise explicitly defined, the terms "installation," "connection," "linking," "fixing," and "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral molding; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] In this invention, unless otherwise explicitly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature above second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature above second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature below second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0064] Explanation of terms and jargon used in this article:

[0065] A water tunnel is a hydrodynamic testing device used to study phenomena such as boundary layer, wake, turbulence, cavitation, and hydroelasticity, as well as the forces between water flow and the test object. A water tunnel is a water circulation system where flow velocity and pressure can be controlled independently. The test section of a water tunnel has circular or square cross-sections. Observation windows (on the walls) are located at the top, bottom, front, and back of the tunnel. The wires of measuring instruments must pass through the walls and be sealed.

[0066] A body of revolution: Imagine two points at either end of an object, with a line connecting these two points passing through the object. The object rotates around this line as its center. During rotation, each part of the object maintains the same shape when it reaches a fixed position. This is a standard body of revolution, and underwater vehicles generally adopt this shape. The difference between body of revolution testing and hydrofoil testing is that hydrofoil testing is typically two-dimensional, while a body of revolution is a three-dimensional structure relative to the water tunnel. That is, the body of revolution is always at a certain distance from any boundary of the water tunnel. Therefore, adjusting the angle of attack of a hydrofoil simply involves rotation. However, if the angle of attack of a body of revolution is also adjusted by rotation, the position of the body's center point will change.

[0067] Angle of attack (ATO): Also known as the angle of attack, it is a fluid dynamics term. For missiles, the angle of attack is defined as the angle between the projection of the velocity vector V onto the longitudinal plane of symmetry and the missile's longitudinal axis; it is positive when the missile is nose-up and negative when it is nose-down. In short, an angle of attack exists when the nose of a rotating body is not parallel to the direction of the incoming flow.

[0068] Blockage effect: refers to the difference in force experienced by an object due to the different flow fields when the object moves in a fluid confined by the walls and bottom of a pool or cylinder versus when the object moves in an infinite fluid.

[0069] In this invention, "upper" and "lower" are both used in the sense of... Figure 1 The markings in the text shall prevail.

[0070] The following is based on Figures 1 to 19 The water tunnel testing apparatus of the present invention will be described in detail.

[0071] In this embodiment, such as Figures 1 to 5 and Figure 7 As shown, the water tunnel test apparatus 100 includes a rotating body 1, a support assembly 2, a drive assembly 3, a water tunnel, and a first sealing element 51. The rotating body 1 is used to simulate an underwater vehicle. The support assembly 2 includes a vertical support member 21 and a horizontal support member 22. The top end of the vertical support member 21 is sealed to the bottom end of the rotating body 1. The support assembly 2 is supported at the tail of the rotating body 1, which can reduce the interference of the support assembly 2 on the flow field near the rotating body 1. The drive end of the drive assembly 3 is coaxially connected to the horizontal support member 22. The drive assembly 3 generates a rotational driving force to drive the horizontal support member 22 to rotate.

[0072] The water tunnel is a closed structure (not shown in the figure), with an internal chamber structure. The rotating body 1 and the vertical support 21 are located inside the water tunnel, while the drive assembly 3 is located outside the water tunnel. Figure 1 and Figure 2 As shown, the water tunnel includes a first sidewall 4, which has an elongated mounting hole 41. When adjusting the angle of attack, the rotating body 1 moves along a circular trajectory. The length direction of the mounting hole 41 is parallel to the horizontal radial direction of the circular motion trajectory formed by the rotating body 1 when adjusting the angle of attack. The first sealing member 51 has a first through hole 511 opposite to the mounting hole 41. The axis of the transverse support member 22 is perpendicular to the first sidewall 4. The transverse support member 22 passes sequentially through the mounting hole 41 and the first through hole 511 of the first sealing member 51 from the outside of the water tunnel and is then sealed to the vertical support member 21. The first sealing member 51 seals the assembly gap between the inner wall of the first sidewall 4 and the transverse support member 22, achieving assembly between the transverse support member 22 and the first sidewall 4 of the water tunnel while ensuring the airtightness of the water tunnel.

[0073] When adjusting the angle of attack, the drive assembly 3 drives the support assembly 2 to rotate the rotating body 1, thereby adjusting its angle of attack. After the rotating body 1 rotates, its center point also rotates, causing a change in its position on the horizontal cross-section of the water tunnel. Specifically, the center point moves closer to one side wall of the water tunnel (left, right, front, or rear side wall), increasing the interference of the water tunnel's internal side wall on the flow field near the rotating body 1, leading to a blockage effect and affecting the accuracy of the simulation test data. Furthermore, the larger the angle of attack of the rotating body 1, the closer its head is to one side wall of the water tunnel, resulting in a significant blockage effect. In this embodiment, as... Figure 3 and Figure 4 As shown, by defining the length direction of the mounting hole 41 as parallel to the horizontal radial direction of the circular motion trajectory formed by the rotating body 1 when adjusting the angle of attack, after the rotating body 1 rotates, the transverse support 22 is translated along the horizontal radial direction to adjust the position of the transverse support 22 passing through the mounting hole 41. This changes the position of the transverse support 22 in the horizontal radial direction of the aforementioned circular motion trajectory, thereby adjusting the center point of the rotating body 1 back to its initial position. This ensures that the center point of the rotating body 1 is always located at the center of the horizontal cross-section of the water tunnel, thereby reducing the impact of the side walls of the water tunnel on the blocking effect.

[0074] For example, when the rotating body 1 rotates in the front-back direction of the water tunnel test device to adjust the angle of attack, the transverse support 22 is translated in the front-back direction so that the center point of the rotating body 1 is always located at the center of the horizontal section of the water tunnel.

[0075] During the process of adjusting the position of the transverse support 22 through the mounting hole 41, the first through hole 511 of the first seal 51 changes with the position of the transverse support 22. Therefore, the installation position of the first seal 51 can be adjusted or the first seal 51 with a different first through hole 511 can be replaced to match the adjustment of the assembly position of the transverse support 22.

[0076] By adopting the above technical solution, the angle of attack of the rotating body 1 inside the water tunnel can be adjusted simply and conveniently without the need for multiple water tunnel test models, thus saving material costs. Simultaneously, it ensures the water tunnel's airtightness, with a simple and convenient sealing operation. Furthermore, it ensures that the center point of the rotating body 1 is always located at the center of the horizontal cross-section of the water tunnel, reducing the blocking effect caused by adjusting the angle of attack of the rotating body 1.

[0077] It should be understood that in the above technical solution, by opening mounting holes 41 in the water tunnel to connect the transverse support 22, only the transverse support 22 needs to be rotated and translated during the adjustment of the angle of attack of the rotating body 1. There is no need to disassemble the device, nor does it affect the connection of the lead wires for the ventilation or measuring components in the water tunnel during the test. If multiple mounting holes are opened in the water tunnel to coordinate the adjustment of the horizontal radial position of the transverse support 22 in the above-mentioned circular motion trajectory, the opening of multiple mounting holes is prone to sealing problems, and the device needs to be disassembled and reassembled to reconnect the transverse support 22. It is also necessary to readjust the connection of the lead wires for the ventilation or measuring components, which is very complicated. Moreover, the adjustment of the translational position of the transverse support 22 is limited by the position of the mounting holes, and the position adjustment is limited.

[0078] The actual application scenario for underwater vehicles is underwater, but the internal space of a water tunnel is very small. To improve the accuracy of simulation test data, it is necessary to minimize the obstruction effect formed by the support component 2, that is, to reduce the obstruction of the water by the support component 2. In one embodiment, such as Figure 3 As shown, the axis of the rotating body 1 coincides with the axis of the vertical support member 21, and as... Figure 7 As shown, the axis of the vertical support 21 is perpendicular to the axis of the horizontal support 22 to reduce the interference of the support assembly 2 on the flow field at the tail of the rotating body 1.

[0079] In one embodiment, both the vertical support 21 and the horizontal support 22 are tubular structures, and the support assembly 2 communicates with the chamber inside the rotating body 1. Specifically, as shown... Figure 7 As shown, the rotating body 1 has a cavity 11 inside, the vertical support member 21 has a first channel 211, and the horizontal support member 22 has a second channel 221. The cavity 11, the first channel 211, and the second channel 221 are connected in sequence to install a ventilation or measurement component (not shown in the figure) for water tunnel testing. It should be understood that the ventilation or measurement component can be the existing ventilation or measurement component of the water tunnel testing device, which will not be described in detail here.

[0080] In one embodiment, the bottom end of the rotating body 1 is provided with an internal thread, and both ends of the vertical support member 21 are provided with external threads. The vertical support member 21 is screwed to the rotating body 1, making it easy to install and remove.

[0081] In one implementation, such as Figure 1 , Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown, the water tunnel test device includes a first connector 61, the outlines of the two sides of its longitudinal section are the outlines of the NACA0040 airfoil, the first connector 61 has a gradually narrowing structure downwards, and the head of the first connector 61 is provided with a concave portion 611.

[0082] Specifically, when the rotating body 1 has no angle of attack, the force exerted by the water on it is small, and the requirements for the support assembly 2 are not high. However, when the rotating body 1 has an angle of attack, the upstream surface of the rotating body 1 increases significantly, resulting in a larger force exerted by the water. If the stiffness of the support assembly 2 is insufficient, both the rotating body 1 and the support assembly 2 will vibrate, thus affecting the accuracy of the test data. While increasing the stiffness of the support assembly 2 to prevent vibration can be achieved, a thicker support assembly 2 would increase the blocking effect. In this embodiment, if... Figure 1 and Figure 7 By partially and rotatably positioning the connection between the vertical support 21 and the horizontal support 22 within the recess 611, and using a first connector 61 to partially enclose the connection, the streamlined structure of the first connector 61 allows water to flow quickly through, acting as a guide and reducing the blockage effect caused by the support assembly 2. In summary, provided the dimensions of the support assembly 2 meet its required rigidity, the streamlined external structure of the connection between the vertical support 21 and the horizontal support 22 is optimized by using the first connector 61 to reduce the interference of the connection between the vertical support 21 and the horizontal support 22 on the flow field at the tail of the rotating body 1. Furthermore, when the support assembly 2 rotates, the first connector 61 remains stationary to ensure that it is always in the optimal flow-guiding state.

[0083] Furthermore, such as Figure 1 , Figure 7 and Figure 9 As shown, the water tunnel testing device includes a second connector 62, the longitudinal section of which is an airfoil (NACA0040), and a second through hole 621. One sidewall of the second connector 62 abuts against the surface wall of the first seal 51, and the other sidewall abuts against the sidewall of the first connector 61. The surface of the first connector 61 facing away from the second connector 62 is curved, and the concave portion 611 is a variable cross-section arc. The second through hole 621 communicates with both the first through hole 511 and the concave portion 611. The transverse support 22 passes through the first seal 51 and rotatably through the first through hole 511 and the concave portion 611 in sequence. In this way, the first connector 61 and the second connector 62 together wrap the portion of the transverse support 22 located inside the water tunnel and partially wrap the connection between the vertical support 21 and the transverse support 22, so as to further reduce the blocking effect of the support assembly 2 on the tail of the rotating body 1 after ensuring the structural strength.

[0084] Furthermore, such as Figure 7 , Figure 10 and Figure 11As shown, the support assembly 2 also includes a bent pipe connector 23. The bent pipe connector 23 sequentially includes a vertical pipe section 231, a spherical connecting section 232, and a horizontal pipe section 233. The vertical pipe section 231 is screwed to the outer periphery of the bottom end of the vertical support 21, and the horizontal pipe section 233 is screwed to the outer periphery of the end of the horizontal support 22 located inside the water tunnel. The internal channel of the bent pipe connector 23 is used for ventilation or the passage of measuring components. Thus, by using the bent pipe connector 23 to connect the vertical support 21 and the horizontal support 22, instead of directly assembling the vertical support 21 and the horizontal support 22, the structural complexity of the vertical support 21 and the horizontal support 22 can be reduced, processing costs can be saved, and assembly can be facilitated. Furthermore, as... Figure 12 As shown, the spherical connecting section 232 and the transverse pipe section 233 of the bent pipe connector 23 are partially tangentially located within the recess 611. The transverse support member 22 does not contact the first connecting member 61, and the bent pipe connector 23 does not contact the second connecting member 62. When the bent pipe connector 23 rotates, the gap between the bent pipe connector 23 and the first connecting member 61 is small, and the two do not interfere with each other. The spherical connecting section 232 is provided to ensure that no additional flow field disturbance is generated at the spherical connecting section 232 when the support assembly 2 rotates.

[0085] Furthermore, the second connector 62 is fixed to the first seal 51 by a cylindrical head screw, and the first connector 61 is fixed to the second connector 62 by a cylindrical head screw.

[0086] In one implementation, such as Figure 7 As shown, both the vertical support 21 and the horizontal support 22 are cylindrical structures to reduce the influence of their outer contours on the flow field inside the water tunnel.

[0087] In one implementation, such as Figure 2 As shown, the inner wall of the first sidewall 4 is provided with a groove 42, and the mounting hole 41 is located in the groove 42, as shown. Figure 6 As shown, the first seal 51 is embedded in the groove 42 to ensure the flatness of the inner surface of the first sidewall 4 and to reduce the interference of the first seal 51 on the flow field inside the water tunnel.

[0088] Furthermore, such as Figure 3 , Figure 4 and Figure 6As shown, the water tunnel testing device 100 also includes a second sealing element 52. The second sealing element 52 and the first sealing element 51 are distributed sequentially along the horizontal radial direction, and the second sealing element 52 abuts against one side wall of the first sealing element 51. The sealing structure formed by the first sealing element 51 and the second sealing element 52 is engaged in the groove 42. In this way, by adjusting the position of the first sealing element 51 and the second sealing element 52 in the horizontal radial direction of the above-mentioned circumferential motion trajectory, the position of the transverse support 22 passing through the mounting hole 41 can also be adjusted to adjust the angle of attack of the corresponding rotating body 1. Of course, the second sealing element 52 is also embedded in the groove 42 to ensure the flatness of the inner surface of the first side wall 4.

[0089] Furthermore, such as Figure 2 As shown, the groove 42 is provided with an annular groove 421, which surrounds the mounting hole 41, and an annular sealing ring (not shown in the figure) is engaged in the annular groove 421. When the first sealing member 51 is embedded in the groove 42, the first sealing member 51 is pressed against the annular sealing ring to ensure that the water in the water hole does not flow into the mounting hole 41, so as to form a seal between the inside and outside of the water hole.

[0090] Furthermore, such as Figure 6 As shown, both the first seal 51 and the second seal 52 are fixed to the first side wall 4 by cylindrical head screws, making assembly simple.

[0091] In one implementation, such as Figure 7 and Figure 19 As shown, the first sidewall 4 is provided with multiple recesses 43, and the other outer walls of the water cave are also provided with multiple recesses to reduce the weight of the water cave.

[0092] In one implementation, such as Figure 13 As shown, a step seal ring 71 and a fixing ring 72 are fitted around the outer periphery of the transverse support member 22. When the transverse support member 22 passes through the first through hole 511 of the first seal member 51, the step seal ring 71 seals the assembly gap between the transverse support member 22 and the hole wall of the first through hole 511, so that the transverse support member 22 can rotate under a certain rotational driving force and also ensure the sealing of the inside and outside of the water tunnel. Moreover, by interfering with the first through hole 511 and pressing the fixing ring 72 against the outside of the step seal ring 71, the step seal ring 71 is prevented from being pushed out under water pressure.

[0093] The Step seal 71 is composed of a rubber O-ring and a PTFE ring. The O-ring acts as the force-applying element, providing sufficient sealing force and compensating for the PTFE ring. The Step seal has advantages such as low friction, no creep, low starting force, and high pressure resistance.

[0094] Furthermore, such as Figure 14As shown, the retaining ring 72 has multiple threaded holes 721 on the side surface opposite to the step seal ring 71. When it is necessary to remove the retaining ring 72, screws are screwed into the threaded holes 721, and the retaining ring 72 can be pulled out by holding the screws.

[0095] In one implementation, such as Figure 1 , Figures 15 to 17 As shown, the water tunnel testing device 100 includes a first half-connector 81, a second half-connector 82, and a bearing 83. The bearing 83 is sleeved on the outer periphery of the transverse support 22. The first half-connector 81 is connected to the outer wall of the water tunnel, and the second half-connector 82 is connected to the first half-connector 81, with both clamping the bearing 83, thereby rotatably connecting the transverse support 22. Specifically, the first half-connector 81 is a block structure with a first semi-circular groove 811; the second half-connector 82 includes a mounting plate 821 and a half-block 822. The mounting plate 821 is fixed to the outer wall of the first side wall 4 by a cylindrical head screw, and the half-block 822 has a second semi-circular groove 8221. The first half-connector 81 is fixed to the upper surface of the half-block 822 by a cylindrical head screw, and the first semi-circular groove 811 and the second semi-circular groove 8221 cooperate to clamp the bearing 83 sleeved on the outer periphery of the transverse support 22 to prevent the transverse support 22 from rotating on its own. The bearing 83 can improve the tightness of the fit between the first half-connector 81, the second half-connector 82 and the transverse support 22.

[0096] Furthermore, such as Figure 16 As shown, the second half connector 82 is also provided with reinforcing ribs 823 to improve its structural strength.

[0097] In one implementation, such as Figure 1 As shown, the drive assembly 3 includes a worm gear reducer 31 and a universal coupling 32. The worm gear reducer 31 has a handle, and its drive end is coaxially connected to one end of the universal coupling 32. The other end of the universal coupling 32 is coaxially connected to the transverse support member 22. The universal coupling is used to reliably transmit torque and motion. The universal coupling has a large angular compensation capability, a compact structure, and high transmission efficiency. The worm gear can drive a structure with large resistance by rotating it with a small force. Therefore, the transverse support member 22 can be driven to rotate by manually driving the handle of the worm gear reducer 31 in cooperation with the universal coupling 32.

[0098] Furthermore, the worm gear reducer 31 uses a hand-cranked worm gear reducer with a speed ratio of 1:100 and an output shaft diameter of 35 mm to ensure that the angle of attack adjustment error is less than 0.05 degrees.

[0099] Furthermore, the universal coupling 32 has a length of 35cm-40cm and a maximum rotation angle of 45 degrees at both ends.

[0100] Furthermore, such as Figure 18 As shown, the transverse support 22 has a keyway 222 at one end outside the water tunnel. A flat key is embedded in the keyway 222 and then connected to the universal coupling 32.

[0101] Furthermore, such as Figure 18 As shown, the transverse support 22 is provided with a through hole 223 at the part outside the water tunnel. The depth direction of the through hole 223 extends radially along the transverse support 22. The through hole 223 is connected to the second channel 221 of the transverse support 22. The cable of the ventilation or measurement component inside the water tunnel passes through the through hole 223 to facilitate connection to other equipment outside the water tunnel test device 100.

[0102] In the fabrication of the water tunnel testing device 100, the rotating body 1, vertical support 21, second connector 62, and water tunnel sidewalls are all made of 6061-T6 aluminum alloy, which provides sufficient structural strength and reduces weight. Furthermore, since aluminum is prone to rusting in water tunnels, the surfaces of these parts undergo hard anodizing treatment for oxidation protection. The transverse support 22, first seal 51, and second seal 52 are made of 316L stainless steel. The first connector 61 is 3D printed using photosensitive material. The bent pipe connector 23 and bearing bush 83 are made of H62 brass. The first half-connector 81 and second half-connector 82 are made of Q235-A structural steel.

[0103] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations included in the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of the present invention that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of the present invention and do not limit the scope of protection of this patent.

Claims

1. A water tunnel testing device with adjustable angle of attack for a rotating body, characterized in that, include: Rotating body (1), which is used to simulate an underwater vehicle; The support assembly (2) includes a vertical support (21) and a horizontal support (22), the top end of which is sealed to the bottom end of the rotating body (1); The drive assembly (3) has its drive end coaxially connected to the transverse support (22); The water tunnel includes a first sidewall (4); the first sidewall (4) is provided with an elongated mounting hole (41), the length direction of which is parallel to the horizontal radial direction of the circular motion trajectory formed by the rotating body (1) when adjusting the angle of attack; The first sealing element (51) has a first through hole (511) opposite to the position of the mounting hole (41); The rotating body (1) and the vertical support (21) are located inside the water tunnel, and the driving assembly (3) is located outside the water tunnel. The horizontal support (22) passes through the mounting hole (41) and the first through hole (511) in sequence and is then sealed to the vertical support (21). The axis of the horizontal support (22) is perpendicular to the first side wall (4). The first sealing member (51) is used to seal the assembly gap between the inner wall of the first side wall (4) and the horizontal support (22). When adjusting the angle of attack, the drive assembly (3) drives the support assembly (2) to rotate the rotating body (1), and adjusts the position of the transverse support (22) through the mounting hole (41) to adjust the angle of attack and make the center point of the rotating body (1) always located at the center of the horizontal section of the water tunnel.

2. The water tunnel testing device with adjustable angle of attack of the rotating body according to claim 1, characterized in that, The axis of the rotating body (1) coincides with the axis of the vertical support (21), and the axis of the vertical support (21) is perpendicular to the axis of the horizontal support (22).

3. The water tunnel testing device with adjustable angle of attack of the rotating body according to claim 1, characterized in that, Both the vertical support (21) and the horizontal support (22) are tubular structures, and the support assembly (2) is connected to the chamber inside the rotating body (1).

4. The water tunnel testing device with adjustable angle of attack of the rotating body according to claim 1, characterized in that, The water tunnel test device includes a first connector (61), the outlines of the two sides of its longitudinal section are the outlines of the NACA0040 airfoil, and its head is provided with an indentation (611). The connection between the vertical support (21) and the horizontal support (22) is partially rotatably located within the recess (611).

5. The water tunnel testing device with adjustable angle of attack of the rotating body according to claim 4, characterized in that, The water tunnel testing device includes a second connector (62), which has a longitudinal section of NACA0040 airfoil and is provided with a second through hole (621); the two sides of the second connector (62) abut against the surface wall of the first sealing member (51) and the side wall of the first connector (61) respectively, and the surface of the first connector (61) facing away from the second connector (62) is curved. The second through hole (621) communicates with the first through hole (511) and the recess (611) respectively, so that the transverse support (22) can rotatably pass through.

6. The water tunnel testing device with adjustable angle of attack of the rotating body according to claim 5, characterized in that, The support assembly (2) further includes a bent pipe connector (23) for connecting the vertical support (21) and the horizontal support (22); The bend connector (23) includes a vertical pipe section (231), a spherical connecting section (232), and a horizontal pipe section (233) in sequence. The spherical connecting section (232) and the horizontal pipe section (233) are located tangentially within the recess (611).

7. The water tunnel testing apparatus with adjustable angle of attack for a rotating body according to any one of claims 1-6, characterized in that, The inner wall of the first sidewall (4) is provided with a groove (42), the mounting hole (41) is located in the groove (42), and the first sealing member (51) is embedded in the groove (42).

8. The water tunnel testing device with adjustable angle of attack of the rotating body according to claim 7, characterized in that, It also includes a second seal (52), which and the first seal (51) are distributed sequentially along the horizontal radial direction, and the second seal (52) abuts against one side wall of the first seal (51); the sealing structure formed by the first seal (51) and the second seal (52) is engaged in the groove (42).

9. The water tunnel testing apparatus with adjustable angle of attack of the rotating body according to claim 7, characterized in that, The groove (42) is provided with an annular groove (421), which surrounds the mounting hole (41) and is used to engage the annular sealing ring.

10. The water tunnel testing apparatus with adjustable angle of attack for a rotating body according to any one of claims 1-6, characterized in that, The outer periphery of the transverse support member (22) is fitted with a Step seal ring (71) and a fixing ring (72); The step seal ring (71) is used to seal the assembly gap between the transverse support (22) and the hole wall of the first through hole (511). The fixing ring (72) is interference-fitted into the first through hole (511) and pressed against the outside of the step seal ring (71).

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