Rotating body ventilation air bubble pressure measuring device for water tunnel test

Abstract

The present application relates to a kind of for water tunnel test rotation body ventilation air bubble pressure measuring device, including rotation body model and multiple micro pressure sensor, the rotation body model includes: rotation body main body, including body and side cover body, the body one side is equipped with opening;The side cover body is detachably connected to the body and seals the opening, and both form hollow passage together;Ventilation passage is respectively communicated with the hollow passage and water tunnel, to be ventilated to the water tunnel to generate air bubble;Wherein, the body is equipped with multiple first installation hole, multiple first installation hole is arranged in multiple rows, the first installation hole and the micro pressure sensor are matched connection one by one.The rotation body ventilation air bubble pressure measuring device of the present application can reliably carry out multiple-point pressure measurement to the surface of rotation body model.

Description

Technical Field

[0001] This invention relates to the field of water tunnel testing equipment, and in particular to a rotating body ventilated cavitation pressure measuring device for water tunnel testing. 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] When a rotating underwater object travels at high speed, it induces highly unsteady, nonlinear, and random cavitation flow, creating an air bubble that surrounds the head of the object and continuously evolves. This cavitation significantly affects the object's motion. Currently, research institutions are developing and applying active aeration cavitation control technology, which uses artificial aeration to control cavitation evolution. This reduces the impact of natural cavitation on the underwater motion of the rotating object, controls hydrodynamic loads, and enhances the stability of the object's exit attitude. However, the aeration cavitation flow of a rotating object is a complex process involving multiphase coupling of gas, vapor, and liquid. The evolution of the aeration cavitation bubble, including its breakage, fusion, detachment, and reflection, is extremely complex, making a thorough understanding of the aeration cavitation flow mechanism a significant challenge.

[0004] In the problem of underwater cavitation launching from a rotating body, one of the most important physical parameters is the pressure on the surface of the rotating body (technically referred to as pressure, and thus hereinafter referred to as pressure). This is because pressure is a direct manifestation of the water resistance load on the rotating body and a direct factor determining the motion process and the attitude of the rotating body upon exiting the water. Since cavitation bubbles cover the entire surface of the rotating body and create a very strong three-dimensional effect, the spatial distribution and temporal evolution of pressure are extremely complex. Therefore, pressure data measurement not only needs to be accurate but also requires acquiring data from as many points on the surface of the rotating body as possible.

[0005] Because prototype testing of underwater launch of a rotating body is prohibitively expensive, and the available data from prototype tests is limited and subject to significant bias, scaled-down model tests must be conducted in a laboratory setting. To obtain stable flow field conditions, the tests must be carried out in a water tunnel. However, the cross-sectional area of ​​the water tunnel test section is typically several tens of centimeters, and to minimize the blockage effect (i.e., the influence of the water tunnel walls on the flow near the central region of the model), the diameter of the rotating body model can only be a few centimeters. Furthermore, the rotating body model is a slender structure with internal ventilation pipes, making it difficult to install numerous pressure sensors. This results in extremely challenging acquisition of pressure data at multiple points on the rotating body's surface. Summary of the Invention

[0006] Based on the aforementioned deficiencies in the prior art, the purpose of this invention is to provide a rotating body ventilated cavitation pressure measuring device for water tunnel testing, which can reliably perform multi-point pressure measurement on the surface of the rotating body model.

[0007] Therefore, the present invention provides the following technical solution.

[0008] This invention provides a rotating body ventilated cavitation pressure measuring device for water tunnel experiments, comprising a rotating body model and multiple miniature pressure sensors, wherein the rotating body model includes:

[0009] The rotating body includes a main body and a side cover. The main body has an opening on one side. The side cover is detachably connected to the main body and seals the opening, and the two together form a hollow channel.

[0010] A ventilation channel, which is connected to the hollow channel and the water hole respectively, is used to ventilate the water hole to generate cavitation bubbles;

[0011] The main body is provided with multiple first mounting holes, which are arranged in multiple rows and columns, and each of the first mounting holes is matched and connected to the miniature pressure sensor.

[0012] Preferably, the side cover has a plurality of second mounting holes arranged in an array, and the second mounting holes are matched and connected one by one with the miniature pressure sensor.

[0013] Preferably, the main body is provided with a plurality of vent holes; the rotating body model also includes a rotating body head that is detachably connected to the rotating body body, and a gap is provided between the bottom end of the rotating body head and the top end of the rotating body body, the gap communicating with the plurality of vent holes to form the ventilation channel.

[0014] Preferably, the rotating body has a recessed cavity at its head, and a connecting portion protrudes from the top of the main body. The connecting portion is screwed into the recessed cavity, and the vent is disposed on the connecting portion. A first gap is formed between the cavity wall and the outer wall of the main body.

[0015] Preferably, the main body of the rotating body is 300mm high and has a maximum outer diameter of 50mm. The wall of the first mounting hole is provided with an M6×0.75 internal thread. The thirty first mounting holes are arranged in a three-column, ten-row array with an interval of 45° between adjacent columns.

[0016] Preferably, the side cover is provided with a second mounting hole arranged in a row of ten, the wall of the second mounting hole is provided with an M6×0.75 internal thread, and the second mounting hole and the first mounting hole located in the middle row are distributed radially along the main body of the rotating body.

[0017] Preferably, the outer periphery of the opening is provided with a groove, and a sealing ring is engaged in the groove; and / or,

[0018] The outer wall of the side cover is provided with countersunk holes and is fixed to the main body by countersunk screws. The outside of the countersunk screws is provided with a putty layer for leveling.

[0019] Preferably, the rotating body ventilated cavitation pressure measuring device includes a pneumatic connector for connecting the ventilated pipeline;

[0020] The top of the hollow channel gradually narrows to form an outlet channel, and the pneumatic connector is screwed into the outlet channel.

[0021] Preferably, the rotating body ventilated cavitation pressure measuring device includes a support assembly, which includes a vertical support pipe, a transition bend pipe and a horizontal support pipe connected in sequence. One end of the horizontal support pipe is located outside the water tunnel, and the vertical support pipe is sleeved on the hollow channel and fixed by fasteners.

[0022] The vertical support tube gradually expands in the direction away from the rotating body model.

[0023] Preferably, the rotating body model has at least three rows of second fixing holes, and the at least three rows of second fixing holes are evenly spaced apart along the circumference of the rotating body model; the vertical support tube has at least three rows of third fixing holes, and the at least three rows of second fixing holes match the at least three rows of third fixing holes to cooperate with the fasteners for fixing.

[0024] Preferably, the rotating body ventilated cavitation pressure measuring device further includes:

[0025] A multi-channel data acquisition card, which is electrically connected to the miniature pressure sensor;

[0026] A computer, which is electrically connected to the multi-channel data acquisition card.

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

[0028] This invention provides a rotating body ventilated cavitation pressure measuring device for water tunnel testing. The rotating body includes a main body and a side cover. The rotating body is designed as a split structure. The opening on the main body is used to allow for the assembly of miniature pressure sensors. This allows a large number of miniature pressure sensors to be installed inside the rotating body model, enabling reliable acquisition of pressure data at multiple points on the surface of the rotating body. Attached Figure Description

[0029] Figure 1 This is a simplified structural diagram of the rotating body ventilated cavitation pressure measuring device of the present invention;

[0030] Figure 2 This is a structural cross-sectional view of the main body of the present invention. Figure 1 ;

[0031] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0032] Figure 4 This is a schematic diagram of a partial assembly structure of the body and the pneumatic connector of the present invention;

[0033] Figure 5 This is a partial structural diagram of the main body of the present invention;

[0034] Figure 6 This is a structural cross-sectional view of the main body of the present invention. Figure 2 ;

[0035] Figure 7 This is a rear view of the side cover of the present invention;

[0036] Figure 8 This is a front view of the side cover of the present invention;

[0037] Figure 9 This is a cross-sectional view of the side cover of the present invention;

[0038] Figure 10 This is a structural cross-sectional view of the rotating body model of the present invention;

[0039] Figure 11 This is a cross-sectional view of the rotating head of the present invention;

[0040] Figure 12 for Figure 10 Enlarged view at point B in the middle;

[0041] Figure 13 This is a schematic diagram of the structure of the miniature pressure sensor of the present invention;

[0042] Figure 14 This is a cross-sectional view of the vertical support tube of the present invention;

[0043] Figure 15 This is a cross-sectional view of the adapter bend of the present invention;

[0044] Figure 16 This is a cross-sectional view of the transverse support tube of the present invention.

[0045] Explanation of reference numerals in the attached figures

[0046] 100. Rotary body ventilated cavitation pressure measuring device;

[0047] 1. Rotational model;

[0048] 11. Rotating body main body; 111. Body; 1111. Opening; 1112. First mounting hole; 1113. Connecting part; 11131. Vent hole; 1114. Planar structure; 1115. Top plane; 1116. First fixing hole; 1117. Second fixing hole; 1118. Slot; 112. Side cover; 1121. Second mounting hole; 1122. Countersunk hole; 113. Hollow channel; 1131. Outlet channel;

[0049] 12. Rotating body head; 121. Cavity; 1211. Threaded connection; 1212. Guide slope; 122. Guide plane;

[0050] 13. Gap; 131. First gap; 132. Second gap;

[0051] 14. Sealing ring;

[0052] 15. Putty layer;

[0053] 2. Pressure sensor;

[0054] 21. Housing; 211. Threaded connection section; 212. Sensing unit; 22. Cable;

[0055] 3. Pneumatic connector;

[0056] 4. Support components;

[0057] 41. Vertical support tube; 411. Third fixing hole; 412. Fourth fixing hole; 413. First snap-fit ​​protrusion; 414. Second snap-fit ​​protrusion; 415. First sleeve part; 416. Second sleeve part; 42. Adapter bend; 421. Fifth fixing hole; 422. Sixth fixing hole; 43. Horizontal support tube; 431. Seventh fixing hole; 432. Third snap-fit ​​protrusion;

[0058] 5. Multi-channel data acquisition card;

[0059] 6. Computer;

[0060] 71. First Grady Circle; 72. Second Grady Circle; 73. Third Grady Circle;

[0061] 200. Water Cave. Detailed Implementation

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] Explanation of terms and jargon used in this article:

[0068] A water tunnel is a device used in hydrodynamic experiments 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 in which flow velocity and pressure can be controlled independently. The test section of the water tunnel has a circular or square cross-section, and observation windows are located at the top, bottom, front, and back.

[0069] A body of revolution: Imagine two points at the two ends of an object, and a line connecting the two points passes through the object. The object rotates around this line as its center. When rotating, each part of the object has the same shape when it reaches a fixed position. This is the standard body of revolution. Underwater vehicles generally have the shape of a body of revolution.

[0070] Cavitation: First, two fundamental physical principles need to be understood: 1) The higher the speed of an object's motion, the lower its surface pressure (Bernoulli's principle); 2) The lower the pressure on water, the lower its boiling point. Due to the first principle, when the speed of a rotating underwater object reaches a certain level, the surface pressure drops significantly. At this point, due to the second principle, the boiling point of water becomes very low. Once it falls below the surrounding temperature, the water vaporizes; this state is called "cavitation." The cavitated water adheres to the surface of the rotating underwater object, forming a bubble, which is called a "cavitation bubble." Cavitation bubbles alter the hydrodynamic properties of the rotating object, potentially causing cavitation erosion or instability. However, if the shape of the cavitation bubbles can be controlled, it can greatly reduce water resistance and adjust the object's attitude. Therefore, the industry has proposed the "ventilation cavitation" method, which involves artificially ventilating the rotating body from the inside to the outside, and using artificial ventilation to create cavitation bubbles to better control the movement of the underwater rotating body.

[0071] In this invention, "upper" and "lower" are both used in the sense of... Figure 1 The markings in the text shall prevail.

[0072] The following is based on Figures 1 to 16 This invention provides a detailed description of the rotating body ventilated cavitation pressure measuring device.

[0073] In this embodiment, such as Figure 1 As shown, the rotating body ventilated cavitation pressure measuring device 100 includes a rotating body model 1 and multiple miniature pressure sensors 2. During the water tunnel test, the rotating body model 1 is located inside the water tunnel 200. A ventilation assembly (not shown in the figure) is installed inside the rotating body model 1, and the ventilation assembly includes ventilation pipes. Air is vented from the interior of the rotating body model 1 into the water tunnel through the ventilation assembly to generate cavitation bubbles around the rotating body model 1.

[0074] In this embodiment, such as Figure 2 , Figure 5 and Figure 10As shown, the rotating body model 1 includes a rotating body body 11 and a ventilation channel. The rotating body body 11 includes a main body 111 and a side cover 112. An opening 1111 is provided on one side of the main body 111. The side cover 112 is detachably connected to the main body 111 and seals the opening 1111. The main body 111 and the side cover 112 together form a hollow channel 113. The ventilation channel communicates with both the hollow channel 113 and the water tunnel 200, and is used to guide the gas generated by the ventilation components within the hollow channel 113 into the water tunnel 200. Figure 2 and Figure 4 As shown, the main body 111 is provided with a plurality of first mounting holes 1112, all of which are arranged in multiple rows and columns. The first mounting holes 1112 and the miniature pressure sensors 2 are matched and connected one by one to install multiple miniature pressure sensors 2 on the main body 111.

[0075] By adopting the above technical solution, the rotating body 11 includes a main body 111 and a side cover 112. The rotating body 11 is set as a split structure. The opening 1111 is set to make way for the assembly operation of the micro pressure sensor 2, so that a large number of micro pressure sensors 2 can be installed inside the rotating body model 1 to obtain pressure data at multiple points on the surface of the rotating body 11.

[0076] It should be understood that in the field of fluid mechanics, a "pressure" sensor generally refers to a sensor that measures the pressure at a certain point, rather than the force; that is, the unit is Pascal (Pa) rather than Newton (N).

[0077] It should be understood that in current hydrodynamic testing within the industry, the term "miniature" in miniature pressure sensors generally refers to a length of less than 30 millimeters and a diameter of less than 10 millimeters.

[0078] In one embodiment, since the rotating body model 1 is extremely small, to reduce machining difficulty and facilitate machining and assembly, the body 111 is formed by a single flat cut on one side of a cylindrical structure, such as by directly machining with a milling cutter on a lathe. Figure 5 and Figure 6 As shown, the two end faces on one side of the body 111 are flush and are both planar structures 1114, as... Figure 9 As shown, the side cover 112 facing the body 111 is a plane that abuts against the planar structure 1114 of the body 111, which facilitates a stable contact between the side cover 112 and the body 111 and makes subsequent assembly easier. Furthermore, the other side of the side cover 112 is a curved surface, which together with the outer wall of the body 111 forms a cylindrical surface.

[0079] Furthermore, such as Figure 6As shown, the distance between the center of the planar structure 1114 and the center of the body 111 is equal to the wall thickness of the body 111. In this way, the size of the opening 1111 can meet the convenient installation of a large number of miniature pressure sensors 2. There is also enough space on both sides of the opening 1111 for installing the sealing ring 14 and for assembling with the side cover 112.

[0080] In one implementation, such as Figure 5 and Figure 6 As shown, a groove 1118 is provided on the outer periphery of the opening 1111, and a sealing ring 14 is engaged in the groove 1118. After the side cover 112 is assembled with the main body 111, the side cover 112 is pressed tightly against the sealing ring 14 to improve the sealing performance at the assembly point of the side cover 112 and the main body 111, thereby improving the waterproof and air-leakage prevention function of the rotating body 11 and avoiding affecting the cavitation test results. Furthermore, one side of the main body 111 is a planar structure 1114, which also facilitates the processing of the groove.

[0081] Furthermore, in order to facilitate the miniaturization design of the rotating body model 1, the sealing ring 14 adopts an O-ring with a wire diameter of 1.2 mm.

[0082] In one implementation, such as Figure 7 and Figure 8 As shown, the side cover 112 has multiple second mounting holes 1121 arranged in an array. Each second mounting hole 1121 is matched and connected to a miniature pressure sensor 2, thereby increasing the number of miniature pressure sensors 2 that can be installed on the rotating body model 1, and thus enabling the collection of pressure data from more points on the surface of the rotating body model 1. Moreover, the side cover 112 is detachably connected to the main body 111. During assembly, the miniature pressure sensors 2 are first installed on their respective structures, and then the side cover 112 and the main body 111 are assembled, making the assembly operation simple.

[0083] In one implementation, such as Figure 3 As shown, the main body 111 is provided with multiple vent holes 11131; as Figure 10 and Figure 12As shown, the rotating body model 1 also includes a rotating body head 12, which is detachably connected to the rotating body body 11 to form the outer shell structure of the rotating body model 1. A gap 13 is provided between the bottom end of the rotating body head 12 and the top end of the rotating body body 11, and the gap 13 communicates with the vent 11131 to form a ventilation channel. Specifically, the rotating body head 12 and the rotating body body 11 are designed to be detachably connected, so that the rotating body head 12 can be designed into different shapes according to needs, so as to replace the rotating body head 12 of different shapes to meet different test requirements. Moreover, the gas inside the rotating body body 11 enters the gap 13 through the vent 11131, and then enters the water hole 200 through the gap 13, which can generate cavitation bubbles at the head position of the rotating body model 1, so as to accurately simulate the situation where air bubbles are generated and continuously develop and evolve around the head of the underwater launched object during high-speed travel. Furthermore, the overall structure of the rotating body model 1 is simple, and there is no need to open a vent on the rotating body head 12.

[0084] Furthermore, such as Figure 11 and Figure 12 As shown, the rotating head 12 has a recessed cavity 121, and the top end of the body 111 has a connecting part 1113 protruding from it. The connecting part 1113 is screwed into the recessed cavity 121, and a vent hole 11131 is provided on the connecting part 1113. Figure 12 As shown, a first gap 131 is formed between the cavity wall of the concave cavity 121 and the outer wall of the main body 111. The setting of the concave cavity 121 is conducive to the uniform flow of gas in the rotating body model 1 into the water tunnel 200 from the gap 13.

[0085] Furthermore, such as Figure 3 As shown, the outer contour of the connecting part 1113 is cylindrical, the diameter of the vent holes 11131 is 2mm and there are nine of them. The nine vent holes 11131 are evenly spaced apart along the circumference of the connecting part 1113, and the interval between two adjacent vent holes 11131 is 40°.

[0086] Furthermore, such as Figure 11 As shown, the cavity 121 includes a threaded part 1211 and a threaded connection part 1113, which are simple and convenient to assemble.

[0087] Furthermore, in one embodiment, such as Figure 11 and Figure 12 As shown, the head 12 of the rotating body has a guide plane 122 at one end facing the main body 11 of the rotating body. The guide plane 122 is parallel to the horizontal plane. A second gap 132 is formed between the guide plane 122 and the top plane 1115 of the main body 111. The second gap 132 is directly connected to the water hole 200. In this way, the rotating body model 1 is horizontally vented.

[0088] In another embodiment, the cavity wall of the concave cavity 121 directly forms one end surface wall structure of the rotating body head 12 (not shown in the figure). In this way, the first gap 131 is directly connected to the water hole 200. By changing the slope of the guide slope 1212, the exhaust angle of the rotating body model 1 can be changed.

[0089] Furthermore, the size of the second gap 132 is 1 mm.

[0090] In one implementation, such as Figure 2 and Figure 4 As shown, all the first mounting holes 1112 on the body 111 are arranged in an array to achieve array-type pressure measurement. The regular arrangement is conducive to compact layout and saves space.

[0091] In one embodiment, the rotating body 11 has a height of 300mm and a maximum outer diameter of 50mm. The wall of the first mounting hole 1112 is provided with an M6×0.75 internal thread. Figure 2 and Figure 4 As shown, the thirty first mounting holes 1112 are arranged in a three-column, ten-row array with adjacent columns spaced 45° apart. By defining the structure and array arrangement of the first mounting holes 1112, thirty miniature pressure sensors 2 can be easily mounted. Furthermore, the 0.75 mm pitch M6 thread on the hole wall of the first mounting holes 1112 is a fine-pitch thread, ensuring a tight seal between the first mounting holes 1112 and the miniature pressure sensors 2. It should be understood that, due to the small size of the rotating body model 1, the number of columns of the first mounting holes 1112 in the body 111 can be two, three, or four, preferably three.

[0092] Furthermore, the distance between the center of the first mounting hole 1112 in the top row and the top surface 1115 of the body 111 is 20mm, and the horizontal array spacing of the first mounting hole 1112 array is 20mm.

[0093] Of course, the location and arrangement of the first mounting hole 1112 on the main body 111 are not limited to this, and can also be any other arrangement that can accommodate a large number of miniature pressure sensors 2.

[0094] Furthermore, such as Figure 7 and Figure 8 As shown, the side cover 112 has a second mounting hole 1121 arranged in ten rows. The wall of the second mounting hole 1121 has an M6×0.75 internal thread. In this way, the rotating body 11 can be equipped with forty miniature pressure sensors 2, which can acquire pressure data of a large number of points on the surface of the rotating body model 1 with high spatial resolution. In addition, as Figure 10As shown, the second mounting hole 1121 and the first mounting hole 1112 located in the middle row are radially distributed along the rotating body 11. In this way, regardless of whether the two end faces of the side of the body 111 with the opening 1111 are flush or have an included angle, the axial lengths of the first mounting hole 1112 and the second mounting hole 1121 are equal, so as to facilitate the assembly of miniature pressure sensors 2 of the same model.

[0095] In one implementation, such as Figure 7 and Figure 8 As shown, the outer wall of the side cover 112 is provided with a countersunk hole 1122, such as Figure 5 As shown, the main body 111 has first fixing holes 1116 on both sides of the opening 1111. A countersunk screw is threaded through the countersunk hole 1122 and screwed into the first fixing hole 1116, thus assembling the side cover 112 with the main body 111. The countersunk screw reduces the protrusion of the outer wall of the side cover 112 after assembly, improving the smoothness of the outer wall surface. To further ensure the smoothness of the outer wall surface of the side cover 112, the countersunk screw is placed in the countersunk hole 1122, and the recessed area of ​​the countersunk screw is repaired with unsaturated polyester resin putty, such as... Figure 1 As shown, a putty layer 15 is formed to obtain a continuous and smooth surface of the rotating body, thereby reducing the interference of the assembly of the side cover 112 and the body 111 on the flow field inside the water tunnel 200 and reducing the impact on the accuracy of the test results.

[0096] Furthermore, the countersunk hole 1122 is of M2 specification.

[0097] In one implementation, such as Figure 13 As shown, the miniature pressure sensor 2 includes a housing 21, a sensor core, and a cable 22. The sensor core is located inside the housing 21. One end of the housing 21 has a threaded connection section 211, which is used to screw into the first mounting hole 1112 or the second mounting hole 1121. When assembling the miniature pressure sensor 2 on the body 111 and / or the side cover 112, PTFE tape is first wrapped around the outer periphery of the threaded connection section 211, and then tightened into the first mounting hole 1112 and / or the second mounting hole 1121. The PTFE tape improves the waterproofness.

[0098] Furthermore, such as Figure 13As shown, the threaded connection section 211 includes cylindrical sections with different outer diameters at both ends. The other end of the outer shell 21 is the sensing part 212. The axial length of the first mounting hole 1112 and the axial length of the second mounting hole 1121 are equal to the axial length of the threaded connection section 211. Thus, when the miniature pressure sensor 2 is screwed into the first mounting hole 1112 or the second mounting hole 1121 through the threaded connection section 211, one end of the sensing part 212 abuts against the inner wall of the rotating body 11, and the end of the threaded connection section 211 away from the sensing part 212 will neither protrude nor be recessed into the outer wall of the rotating body 11. This reduces the interference of the installation of the miniature pressure sensor 2 on the flow field inside the water tunnel 200.

[0099] Furthermore, the axial length of the first mounting hole 1112 and the second mounting hole 1121 is 12mm.

[0100] In one embodiment, the miniature pressure sensor 2 is model CYG1505AF, purchased from Kunshan Shuangqiao Sensor Measurement and Control Technology Co., Ltd., and is small in size and highly accurate.

[0101] In one implementation, such as Figure 4 As shown, the rotating body ventilated cavitation pressure measuring device includes a pneumatic connector 3. One end of the pneumatic connector 3 is connected to a ventilated pipeline for external ventilation. The pneumatic connector 3 provides good sealing and fixed connection. The top of the hollow channel 113 gradually narrows to form an outlet channel 1131, and the pneumatic connector 3 is screwed into the outlet channel 1131. Further, one end of the pneumatic connector 3 has a 1 / 8 thread outer diameter. In a specific embodiment, the distance between the center of the first mounting hole 1112 in the top row and the top surface 1115 of the body 111 is 20mm, which can prevent positional interference between the miniature pressure sensor 2 located in the top row and the pneumatic connector 3.

[0102] In one implementation, such as Figure 1 , Figures 14 to 16As shown, the rotating body ventilation cavitation pressure measuring device 100 includes a support component 4. The support component 4 includes a vertical support pipe 41, a transition bend pipe 42 and a horizontal support pipe 43 connected in sequence. One end of the horizontal support pipe 43 is located outside the water tunnel 200. The vertical support pipe 41 is sleeved on the hollow channel 113 and fixed by fasteners. The ventilation pipe and cable 22 inside the rotating body model 1 pass through the pipe of the support component 4 to lead out to the outside of the water tunnel 200. In this scheme, by limiting the number and position of the fixing holes on the vertical support pipe 41 and the main body 111, several different and definite fitting positions of the rotating body model 1 relative to the vertical support pipe 41 in the circumferential direction can be formed. By adjusting the fitting position of the rotating body model 1 relative to the vertical support pipe 41, the relative position of the miniature pressure sensor 2 on the rotating body model 1 and the water tunnel 200 can be controllably adjusted to form different tests. Through the cooperation of multiple tests, pressure data of more points on the surface of the rotating body model 1 at the corresponding position in the water tunnel 200 can be obtained. After each position adjustment, at least one row of miniature pressure sensors 2 coincides with the position of one row of miniature pressure sensors 2 in the previous test. In this way, the previous test data of that row of miniature pressure sensors 2 can be compared with the test data of the current test to obtain the test deviation caused by the deviation of the flow direction in the water tunnel 200 between different tests, so as to correct the deviation. If the rotating body model 1 is screwed to the vertical support tube 41, the installation position of the rotating body model 1 relative to the vertical support tube 41 in the circumferential direction cannot be accurately adjusted.

[0103] In addition, such as Figure 1 As shown, the vertical support tube 41 is fitted into the hollow channel 113. In this way, the top dimension of the vertical support tube 41 is small, so as to avoid the assembly between the two causing the top dimension of the vertical support tube 41 to be too large, which would interfere with the flow field near the rotating body model 1.

[0104] Furthermore, the rotating body model 1 is provided with at least three rows of second fixing holes 1117, and all rows of second fixing holes 1117 are evenly spaced along the circumference of the rotating body model 1. The vertical support tube 41 is provided with at least three rows of third fixing holes 411, and the positions of all rows of second fixing holes 1117 and all rows of third fixing holes 411 are matched one-to-one to achieve fixation with fasteners. In this way, by rotating the rotating body model 1, the fitting position of the rotating body model 1 relative to the vertical support tube 41 can be adjusted to obtain pressure data at more points on the surface of the rotating body model 1. Moreover, by defining the array arrangement position of the second fixing holes 1117 on the rotating body model 1, a reference group is ensured for reference between different tests. Furthermore, the second fixing holes 1117 are provided on the body 111.

[0105] In one specific implementation, such as Figure 2 and Figure 4As shown, three rows of miniature pressure sensors 2 are mounted on the main body 111, with adjacent rows spaced 45° apart, as... Figure 7 and Figure 10 As shown, a row of miniature pressure sensors 2 is mounted on the side cover 112, and this row of miniature pressure sensors 2 is radially distributed along the main body 111, with the row of miniature pressure sensors 2 located in the middle. Figure 2 As shown, the body 111 has four rows of second fixing holes 1117 distributed at 90° intervals between adjacent rows, as shown. Figure 14 As shown, the vertical support tube 41 has four rows of third fixing holes 411, with adjacent rows spaced 90° apart. M4 screws are threaded through the second fixing holes 1117 and then screwed into the third fixing holes 411 for fixation. Thus, after rotating 90° to adjust the fitting position of the rotating model 1 relative to the vertical support tube 41, a row of miniature pressure sensors 2 on the rotating model 1 coincides with the position of a row of miniature pressure sensors 2 from the previous test, serving as a reference group.

[0106] Furthermore, the second fixing hole 1117 is a countersunk hole, so that the rotating body model 1 and the vertical support tube 41 can be fixed with countersunk screws. After the countersunk screws are installed, the surface is filled with putty to improve the smoothness of the surface of the rotating body ventilation cavitation pressure measuring device 100 located in the water tunnel 200.

[0107] Since the length of the vertical support pipe 41 is generally equal to the length of the rotating body model 1, if the vertical support pipe 41 is too thin, it will affect its structural strength; if it is too thick, it will cause strong interference to the flow field inside the water tunnel 200. In this embodiment, if... Figure 1 and Figure 14 As shown, the vertical support pipe 41 gradually expands in the direction away from the rotating body model 1. The structure of the end of the vertical support pipe 41 closer to the rotating body model 1 is designed to be smaller, while the end farther away from the rotating body model 1 is designed to be thicker. In this way, the vertical support pipe 41 is guaranteed to have sufficient rigidity and strength to support the rotating body model 1, while the vertical support pipe 41 is designed to be as small as possible to reduce the interference of the vertical support pipe 41 on the flow field inside the water tunnel 200.

[0108] In one embodiment, the vertical support pipe 41, the transition bend 42, and the horizontal support pipe 43 are sequentially sleeved together and fixed by fasteners (such as screws). Specifically, as shown in the figure... Figures 14 to 16As shown, the vertical support pipe 41 has a fourth fixing hole 412, the two ends of the transition bend pipe 42 have a fifth fixing hole 421 and a sixth fixing hole 422 respectively, and the end of the horizontal support pipe 43 located inside the water tunnel 200 has a seventh fixing hole 431. Among them, the fifth fixing hole 421 and the sixth fixing hole 422 are countersunk holes. The vertical support pipe 41 and the horizontal support pipe 43 are respectively fitted into the two ends of the transition bend pipe 42 by the countersunk screws, and the assembly of the countersunk screws is filled with putty.

[0109] Of course, the assembly method between the vertical support pipe 41, the transition bend pipe 42 and the horizontal support pipe 43 is not limited to this, and they can also be directly fixed by screw connection.

[0110] Furthermore, such as Figure 14 As shown, the top end of the vertical support tube 41 is provided with a first snap-fit ​​protrusion 413, and the bottom end is provided with a second snap-fit ​​protrusion 414. A first glyph ring 71 is snapped onto the outer periphery of the first snap-fit ​​protrusion 413 to seal the assembly point of the vertical support tube 41 and the rotating body model 1; a second glyph ring 72 is snapped onto the outer periphery of the second snap-fit ​​protrusion 414 to seal the assembly point of the vertical support tube 41 and the transition bend 42. Figure 16 As shown, the transverse support pipe 43 is provided with a third snap-fit ​​protrusion 432 at one end inside the water tunnel 200. A third glyph 73 is snapped onto the outer periphery of the third snap-fit ​​protrusion 432 to seal the assembly of the transverse support pipe 43 and the transition bend 42.

[0111] It should be understood that Glyd rings include rubber O-rings and polytetrafluoroethylene (PTFE) rings, with the O-rings applying force. Glyd rings are double-acting piston seals, possessing advantages such as low friction, no creep, low starting force, and high pressure resistance.

[0112] In one embodiment, the curved structure of the transition bend 42 makes it inconvenient to thread ventilation pipes and a large number of cables 22 through it. By setting the vertical support pipe 41, the transition bend 42 and the horizontal support pipe 43 as separate structures, during assembly, the ventilation pipes and cables 22 are threaded through first, and then the vertical support pipe 41, the transition bend 42 and the horizontal support pipe 43 are assembled, which makes the operation convenient.

[0113] In one embodiment, the axial length of the vertical support tube 41 is 300 mm, and the axial length of the horizontal support tube 43 is 300 mm.

[0114] In one embodiment, the through hole inside the vertical support tube 41 for the ventilation pipe and the cable of the miniature pressure sensor 2 to pass through has a diameter of 15.2 mm. The outer diameter of the first sleeve part 415 that fits between the vertical support tube 41 and the rotating body model 1 is 40 mm. The outer diameter of the second sleeve part 416 that fits between the vertical support tube 41 and the transition bend 42 is 25 mm.

[0115] In one embodiment, a mounting through hole (not shown in the figure) is provided on one side wall of the water tunnel 200, and the transverse support pipe 43 passes through the mounting through hole and is fixed by welding.

[0116] In one implementation, such as Figure 1 As shown, the rotating body ventilated cavitation pressure measuring device 100 also includes a multi-channel data acquisition card 5 and a computer 6. The multi-channel data acquisition card 5 is electrically connected to the miniature pressure sensor 2, and the computer 6 is electrically connected to the multi-channel data acquisition card 5. The multi-channel data acquisition card 5 acquires the signal data from the miniature pressure sensor 2 and sends it to the computer 6. The computer 6 stores, analyzes, and processes the received pressure data.

[0117] In the manufacturing of the rotating body ventilated cavitation pressure measuring device 100, both the rotating body body 11 and the rotating body head 12 are 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 to provide anti-oxidation protection. The support component 4 is made of stainless steel, which facilitates manufacturing while ensuring structural strength.

[0118] It should be understood that while the above solution may seem to only increase the number of measurement points, the installation of a large number of miniature pressure sensors presents several challenges. First, due to the extremely small size of the rotating model, not only will the miniature pressure sensors installed inside obstruct each other, but they will also obstruct the air ducts. Second, assembling a large number of miniature pressure sensors is difficult. Third, the cables for the numerous miniature pressure sensors need to be led out of the water tunnel; how to design the support components to meet the requirements of support, cable routing, and minimizing interference with the flow field inside the water tunnel is crucial. Fourth, there is the issue of sealing the entire device. Therefore, this invention optimizes the structure and dimensions, enabling the installation of a large number of miniature pressure sensors (e.g., forty), and offers advantages such as easy assembly, minimal impact on the flow field, and good sealing.

[0119] 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 rotating body ventilated cavitation pressure measuring device for water tunnel testing, characterized in that, The rotating body model (1) includes a rotating body model (1) and multiple miniature pressure sensors (2), wherein the rotating body model (1) includes: The rotating body (11) includes a main body (111) and a side cover (112). The main body (111) has an opening (1111) on one side. The side cover (112) is detachably connected to the main body (111) and seals the opening (1111). The two together form a hollow channel (113). Ventilation channels, which are respectively connected to the hollow channel (113) and the water hole (200), are used to ventilate the water hole (200) to generate cavitation bubbles; The main body (111) is provided with a plurality of first mounting holes (1112), which are arranged in multiple rows and columns, and the first mounting holes (1112) and the miniature pressure sensor (2) are matched and connected one by one; When the rotating body ventilated cavitation pressure measuring device (100) is used for water tunnel testing, the axial direction of the rotating body model (1) extends in the vertical direction; The side cover (112) is provided with a plurality of second mounting holes (1121) arranged in an array, and the second mounting holes (1121) are matched and connected to the miniature pressure sensor (2) one by one; The maximum outer diameter of the rotating body (11) is 50 mm, and the thirty first mounting holes (1112) are arranged in a three-column, ten-row array with a 45° interval between adjacent columns.

2. The rotating body ventilated cavitation pressure measuring device according to claim 1, characterized in that, The main body (111) is provided with a plurality of ventilation holes (11131); the rotating body model (1) also includes a rotating body head (12) detachably connected to the rotating body body (11), and a gap (13) is provided between its bottom end and the top end of the rotating body body (11), the gap (13) communicating with the plurality of ventilation holes (11131) to form the ventilation channel.

3. The rotating body ventilated cavitation pressure measuring device according to claim 2, characterized in that, The rotating head (12) is provided with a cavity (121), and the top end of the body (111) is provided with a connecting part (1113). The connecting part (1113) is screwed to the cavity (121), and the vent (11131) is provided on the connecting part (1113). A first gap (131) is formed between the cavity wall of the cavity (121) and the outer wall of the body (111).

4. The rotating body ventilated cavitation pressure measuring device according to claim 1, characterized in that, The rotating body (11) is 300mm high, and the wall of the first mounting hole (1112) is provided with an internal thread of M6×0.

75.

5. The rotating body ventilated cavitation pressure measuring device according to claim 4, characterized in that, The side cover (112) is provided with a second mounting hole (1121) arranged in a row of ten rows. The wall of the second mounting hole (1121) is provided with an internal thread of M6×0.

75. The second mounting hole (1121) and the first mounting hole (1112) located in the middle row are distributed radially along the rotating body (11).

6. The rotating body ventilated cavitation pressure measuring device according to any one of claims 1-5, characterized in that, The outer periphery of the opening (1111) is provided with a groove (1118), and a sealing ring (14) is engaged in the groove (1118); and / or, The outer wall of the side cover (112) is provided with countersunk holes (1122) and is fixed to the body (111) by countersunk screws. The outside of the countersunk screws is provided with a putty layer (15) for leveling.

7. The rotating body ventilated cavitation pressure measuring device according to any one of claims 1-5, characterized in that, The rotating body ventilated cavitation pressure measuring device includes a pneumatic connector (3) for connecting the ventilated pipeline; The top of the hollow channel (113) gradually narrows to form an outlet channel (1131), and the pneumatic connector (3) is screwed into the outlet channel (1131).

8. The rotating body ventilated cavitation pressure measuring device according to any one of claims 1-5, characterized in that, The rotating body ventilated cavitation pressure measuring device includes a support assembly (4), which includes a vertical support pipe (41), a transition bend pipe (42), and a horizontal support pipe (43) connected in sequence. One end of the horizontal support pipe (43) is located outside the water tunnel (200), and the vertical support pipe (41) is sleeved on the hollow channel (113) and fixed by fasteners. The vertical support tube (41) has a gradually expanding structure in the direction away from the rotating body model (1).

9. The rotating body ventilated cavitation pressure measuring device according to claim 8, characterized in that, The rotating body model (1) is provided with at least three rows of second fixing holes (1117), and the at least three rows of second fixing holes (1117) are evenly spaced apart along the circumference of the rotating body model (1); the vertical support tube (41) is provided with at least three rows of third fixing holes (411), and the at least three rows of second fixing holes (1117) match the at least three rows of third fixing holes (411) to cooperate with the fasteners to achieve fixation.

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