Device and method for accurately measuring resistance based on water tunnel flow field

Abstract

The invention discloses an accurate measurement device and method based on water tunnel flow field resistance, and relates to the technical field of flow field medium measurement. Comprising a working section and a test board. The working section is internally provided with a testing assembly for testing the flow field medium resistance of the testing plate; the test assembly comprises a fixed plate; sensor fixing seats are symmetrically and fixedly connected to the fixing plate, force sensors are fixedly connected to the sensor fixing seats, and the force sensors are used for detecting the force values of a flow field medium in the working section acting on the X-axis direction and the Y-axis direction of the testing plate; the force sensors are fixedly connected with connecting plates. An adjusting assembly used for adjusting the height of the testing plate is arranged between the testing plate and the connecting plates. The force measuring directions of the Y-axis directions of the adjacent force sensors are opposite, and the force value output by the S-shaped force sensor is the resultant force of the X-axis direction and the Y-axis direction; the horizontal resistance of a flow field medium borne by the test plate can be accurately measured, meanwhile, the pressure difference interference force in the vertical direction is effectively counteracted, and the resistance test precision and stability are improved.

Description

Technical Field

[0001] This invention relates to the field of flow field medium measurement technology, specifically to a device and method for accurate measurement of flow field resistance in a water tunnel. Background Technology

[0002] With the rapid development of marine technology, underwater vehicles are playing an increasingly important role in key areas such as deep-sea exploration, resource exploration, and national defense. Their hydrodynamic performance directly determines their navigation efficiency, endurance, and mission reliability, while the drag generated by the interaction between the flow field medium and the vehicle surface during navigation is one of the core factors restricting performance improvement. Therefore, accurate characterization of the drag of underwater vehicles has become crucial for designing the surface morphology of low-drag underwater vehicles.

[0003] In existing technologies, for example, the LS-300 flow field resistance measurement device (common commercial force measurement equipment used in small and medium-sized water tunnel test scenarios) uses a single set of three-dimensional force sensors (approximately 50mm×40mm×80mm in size) as its core. These sensors are fixed inside the working section of the water tunnel by a rigid bracket. The sensors directly collect the flow field force on the test specimen and then separate the horizontal resistance data through software algorithms.

[0004] However, in actual use of the above-mentioned measuring device, the software algorithm is difficult to effectively counteract the interference force of the flow field pressure difference on the Y-axis of the test piece. The separation error of the software algorithm is large, and the actual test repeatability error is usually 5%-8%, which deviates greatly from the theoretical calculation value. It is difficult to meet the requirement of accurately characterizing the drag of the submarine. Therefore, it is necessary to propose an accurate measurement device for drag based on the flow field of a water tunnel to solve the above problems. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a precise measurement device for flow field resistance in a water tunnel environment. This device can accurately measure the horizontal resistance of the flow field medium acting on the test plate while effectively counteracting vertical pressure difference interference, thereby improving the accuracy and stability of resistance testing.

[0006] The basic concept of the technical solution adopted in this invention is:

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A precise measurement device for flow field resistance based on a water tunnel includes a water tunnel test bench, a working section, and a test plate; the water tunnel test bench is used to transport the flow field medium within the working section, and a test assembly is provided within the working section for testing the flow field medium resistance of the test plate; the test assembly includes a fixed plate; sensor mounting bases are symmetrically fixedly connected to the fixed plate, and force sensors are fixedly connected to each sensor mounting base; the force sensors are used to detect the force values ​​of the flow field medium acting on the test plate in the X-axis and Y-axis directions within the working section; each force sensor is fixedly connected to a connecting plate, and an adjustment assembly for adjusting the height of the test plate is provided between the test plate and the connecting plate; the force measurement directions of adjacent force sensors in the Y-axis direction are installed in opposite directions, and the force value output by the S-type force sensor is the resultant force in the X-axis and Y-axis directions.

[0008] The technical principles of the above solution are as follows:

[0009] The water tunnel test rig delivers a flow field medium into the working section, creating a stable and controllable water flow environment to simulate the flow field conditions during actual underwater vehicle navigation. Force sensors symmetrically mounted on the fixed plate are horizontally and coaxially arranged on the working section via sensor mounting brackets, with their Y-axis force measurement directions reversed. When the test plate experiences resistance from the flow field medium, this resistance is transmitted to the two force sensors via a connecting plate. The force sensors convert the force value into a positive or negative electrical signal output (the force sensor with the force measurement direction in the positive Y-axis outputs a positive signal, and the force sensor with the force measurement direction in the reverse Y-axis outputs a negative signal). Because the force sensors are installed with their Y-axis directions reversed, the interference force of the flow field medium acting on the test plate along the Y-axis is canceled out by the positive and negative values ​​output by the two force sensors, ultimately retaining only the resultant force value in the horizontal direction (the flow direction of the flow field medium is the X-axis), which represents the actual flow field resistance experienced by the test plate, thus achieving accurate force measurement.

[0010] Furthermore, the force sensor is an S-type force sensor, and the force value output by the S-type force sensor is the resultant force in the X-axis and Y-axis directions.

[0011] Beneficial effects: The S-type force sensor has the ability to measure force in both tension and compression. It has a compact structure and stable sensitivity, and can accurately capture the resultant force signal in both X and Y axes. With the reverse installation design, it can efficiently separate interference force and target resistance. At the same time, its miniaturized size is suitable for narrow installation space, further ensuring the force measurement accuracy and device adaptability in small water tunnel environments.

[0012] Furthermore, the flow field medium contains several weightless particles.

[0013] Beneficial effects: Weightless particles can move synchronously with the flow field medium, and their trajectory can intuitively characterize the real flow state of the flow field, providing a visual verification basis for drag data, helping researchers to deeply analyze the interaction mechanism between the flow field and the test plate, and providing more comprehensive reference data for drag reduction optimization design.

[0014] Furthermore, the mounting plate is provided with a flow guiding component to prevent the flow field medium from impacting the sensor; the flow guiding component includes a flow guide shroud fixedly connected to the mounting plate.

[0015] Beneficial effects: The flow guide can block the flow field medium from directly impacting the sensor, avoid the force fluctuation of the sensor caused by water flow turbulence, ensure the stability of the sensor output signal, and at the same time reduce the influence of flow field disturbance on the flow field around the test plate, ensuring that the measurement data truly reflects the frictional resistance between the flow field and the test plate, and improve the reliability of the test.

[0016] Furthermore, the adjustment assembly includes several hollow positioning internal threaded tubes that are fixedly connected to the connecting plate; the test plate is rotatably fitted with several adjusting bolts that correspond one-to-one with the hollow positioning internal threaded tubes, and the adjusting bolts are threadedly engaged with their adjacent hollow positioning internal threaded tubes.

[0017] Beneficial effects: The threaded fit structure allows for fine adjustment of the test plate height, ensuring that the test plate is precisely parallel to the upper surface of the guide shield. It is also compatible with test plates of different thicknesses, making operation convenient and positioning secure. This expands the testing range of the device and avoids force measurement errors caused by test plate height deviations.

[0018] Furthermore, through holes are opened on the side wall of the working section, and transparent observation windows are installed on the through holes.

[0019] Beneficial effects: The transparent observation window provides a clear observation channel for high-speed camera shooting, enabling real-time capture of the motion trajectory of weightless particles.

[0020] Furthermore, the observation components include a high-speed motion camera positioned next to the working section, which is used to capture the motion state of weightless particles in the flow field medium within the working section through a transparent observation window.

[0021] Beneficial effects: High-speed motion cameras can accurately record the dynamic trajectories of weightless particles. Subsequent data analysis can quantify the velocity distribution and flow characteristics of the flow field, intuitively presenting the changes in the flow field around the test plate. This provides visualized data support for the study of drag generation mechanisms and enhances the analytical depth of test results.

[0022] Furthermore, the top wall of the working section has an illumination hole, and a transparent illumination window is installed on the illumination hole.

[0023] Beneficial effects: The transparent illumination window provides a stable light path for the supplementary lighting components, ensuring that the laser source can uniformly illuminate the flow field area within the working section.

[0024] Furthermore, it also includes a supplementary lighting component for supplementing light to weightless particles in the flow field medium. The supplementary lighting component includes a laser emitter disposed above the working section. The laser emitter is used to emit a laser source through a transparent illumination window to supplement light to the weightless particles.

[0025] Beneficial effects: Laser sources are characterized by strong directionality and high brightness, which can accurately illuminate weightless particles in the flow field, significantly improve the clarity of particle trajectory imaging, avoid trajectory recognition errors caused by dim lighting, and provide high-quality visualization data for flow field state analysis.

[0026] Furthermore, the weightless particles are one of polystyrene microspheres, hollow glass microspheres, and alumina-modified microspheres.

[0027] Beneficial effects: The density of these particles can be precisely matched to the flow field medium, they can move synchronously with the water flow and have stable chemical properties, they will not pollute the flow field or corrode the device components, and their size is suitable for observation needs, making it easy for high-speed cameras to capture the trajectory.

[0028] In summary, the above-mentioned approach has the following beneficial effects:

[0029] 1. This solution uses a structure design with dual force sensors installed in opposite directions on the Y-axis to cancel out interference forces in the vertical direction of the Y-axis, retaining only the flow field resistance signal in the horizontal X-axis direction, thus enabling high-precision measurement of resistance in a water tunnel environment.

[0030] 2. This solution, combined with the miniaturized force sensor's ability to fit into confined installation spaces, solves the problems of traditional sensors being large in size, limited in installation in small water holes, and having large testing errors.

[0031] 3. This solution can flexibly adapt to test plates of different thicknesses by adjusting the components, thus expanding the compatibility range of the test plates and improving the versatility of the device and the reliability of the test data. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is an isometric view of the water tunnel flow field resistance precision measurement device of the present invention.

[0034] Figure 2 This is an isometric view of the working section inside the water tunnel flow field resistance precision measurement device of the present invention.

[0035] Figure 3This is an isometric view of the inside of the flow guide shroud in the water tunnel flow field resistance precision measurement device of the present invention.

[0036] Figure 4 This is an isometric view of the installation of the S-shaped force sensor in the water tunnel flow field resistance precision measurement device of the present invention;

[0037] Figure 5 This is a schematic diagram of the working section inside the water tunnel flow field resistance precision measurement device of the present invention;

[0038] Figure 6 This is a schematic diagram of the internal structure of the test plate and the fixing plate of the present invention.

[0039] The diagram includes: 1. Working section; 2. Test plate; 3. Fixing plate; 4. Sensor mounting base; 5. S-shaped force sensor; 6. Draft shield; 7. Hollow positioning internal threaded tube; 8. Adjusting bolt; 9. Transparent observation window; 10. High-speed motion camera; 11. Transparent illumination window; 12. Laser emitter; 13. Connecting plate; 14. Waist-shaped long groove; 15. Connecting part. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] As attached Figure 1 and Figure 2 As shown, this is one embodiment of the present invention, a precise measurement device for flow field resistance based on a water tunnel, including a water tunnel test bench, a working section 1 and a test plate 2; the water tunnel test bench is used to transport the flow field medium in the working section 1, and the working section 1 is provided with a test component for testing the flow field medium resistance of the test plate 2.

[0044] like Figure 4 As shown, specifically, the test assembly includes a fixed plate 3; sensor mounting bases 4 are symmetrically welded onto the fixed plate 3, and force sensors are fixedly connected to each sensor mounting base 4 by screws. These force sensors are used to detect the resultant force values ​​of the flow field medium acting on the test plate 2 along the X and Y axes within the working section 1; each force sensor is fixedly connected to a connecting plate 13 by screws, and an adjustment assembly for adjusting the height of the test plate 2 is provided between the test plate 2 and the connecting plate 13; adjacent force sensors are installed with opposite force measurement directions along the Y axis. The fixed plate 3 is equipped with a flow guiding assembly to prevent the flow field medium from impacting the sensors.

[0045] The force sensor is an S-type force sensor 5, and the force value output by the S-type force sensor 5 is the resultant force in the X-axis and Y-axis directions.

[0046] like Figure 1 As shown, a through hole is opened on the side wall of working section 1, and a transparent observation window 9 is installed on the through hole; an illumination hole is opened on the top wall of working section 1, and a transparent illumination window 11 is installed on the illumination hole.

[0047] The flow field medium contains several weightless particles; the working section 1 is equipped with an observation component for observing the motion state of the weightless particles in the flow field medium within the working section 1. The weightless particles are one of polystyrene microspheres, hollow glass microspheres, and alumina-modified microspheres. In this embodiment, the weightless particles are polystyrene microspheres arranged in the flow field medium.

[0048] Combination Figure 2 and Figure 4 As shown, the two ends of the working section 1 are installed at the corresponding interfaces of the water tunnel test rig, ensuring a sealed connection between the working section 1 and the water tunnel test rig. This ensures stable and leak-free flow of the flow field medium within the working section 1. The fixing plate 3 is then fixed to the bottom wall of the working section 1 using bolts. The installation heights of the two S-shaped force sensors 5 are kept consistent to ensure that subsequent installations of the S-shaped force sensors 5 are on the same horizontal plane. The two S-shaped force sensors 5 are respectively fixed to the sensor mounting base 4. One S-shaped force sensor 5 is installed in the positive Y-axis force measurement direction, and the other is installed in the negative Y-axis force measurement direction. After installation, the two sensors are calibrated using a spirit level to ensure coaxial alignment in the X-axis direction. The X, Y, and Z axes are shown in the diagram. Figure 1 As shown.

[0049] Combination Figure 1 , Figure 2 and Figure 4 As shown, during the test, the water tunnel test bench delivers the flow field medium into the working section 1 to form a stable and controllable water flow environment, simulating the flow field conditions when the underwater vehicle is actually navigating. The flow field medium will generate resistance as it flows over the top surface of the test plate 2. The main force in the water tunnel resistance test is in the horizontal direction, but the pressure difference will also affect the Y-axis direction, especially in the test of rotating bodies. At this time, the S-shaped force sensors 5 symmetrically installed on the fixed plate 3 are kept horizontally and coaxially arranged on the working section 1 by the sensor fixing seat 4, and the Y-axis force measurement direction is reversed.

[0050] When the top surface of the test plate 2 experiences resistance due to the flow medium, the resistance is transmitted to the two S-shaped force sensors 5 through the connecting plate 13. The S-shaped force sensors 5 convert the force value into a positive or negative electrical signal output. The electrical signal output by the S-shaped force sensor 5 installed in the positive direction of the Y-axis is positive, and the electrical signal output by the S-shaped force sensor 5 installed in the opposite direction of the Y-axis is negative.

[0051] Because the S-type force sensor 5 is installed in reverse along the Y-axis, the interference force exerted by the flow medium on the test plate 2 along the Y-axis is canceled out by the positive and negative values ​​output by the two S-type force sensors 5. Ultimately, only the resultant force value in the horizontal direction (the flow direction of the flow medium is the X-axis) remains, which is the actual flow resistance experienced by the test plate 2, thus achieving accurate force measurement. The resistance at different flow velocities is obtained by adjusting the flow rate of the water tunnel test bench. Its repeatability error is less than 1%, and the error compared to the theoretical calculation is 3%. This equipment has a simple structure, low operating cost, and is easy to operate.

[0052] like Figure 2 As shown, specifically, the flow guiding assembly includes a flow guide shroud 6 that is fixedly connected to the mounting plate 3 by screws. During testing, the flow guide shroud 6 prevents the flow field medium from directly impacting the S-shaped sensor, thus avoiding any impact on the accuracy of the test results.

[0053] like Figure 3 As shown, specifically, the adjustment assembly includes several hollow positioning internal threaded tubes 7 that are all fixedly welded to the connecting plate 13; the test plate 2 is rotatably fitted with several adjusting bolts 8 that correspond one-to-one with the hollow positioning internal threaded tubes 7, and the adjusting bolts 8 are all threadedly fitted with their adjacent hollow positioning internal threaded tubes 7.

[0054] Combination Figure 2 and Figure 3 As shown, the height of the test plate 2 can be finely adjusted by rotating the adjusting bolt 8 clockwise or counterclockwise until the upper surface of the test plate 2 is at the same level as the upper surface of the guide shroud 6. After completion, the adjusting bolt 8 is locked to achieve the fixed positioning of the test plate 2. This solution can test test plates 2 of different thicknesses. During the test, the test plate 2 is made parallel to the top of the guide shroud 6 by adjusting the component, so that the frictional resistance at the top of the test plate 2 can be collected, thereby expanding the test range of the water tunnel test plate 2.

[0055] like Figure 1 As shown, specifically, the observation component includes a high-speed motion camera 10 located next to the working section 1. The high-speed motion camera 10 is used to capture the motion state of weightless particles in the flow field medium within the working section 1 through the transparent observation window 9.

[0056] like Figure 1 As shown, specifically, it also includes a supplementary lighting component for supplementing light to weightless particles in the flow field medium. The supplementary lighting component includes a laser emitter 12 disposed above the working section 1. The laser emitter 12 is used to emit a laser source through the transparent illumination window 11 to supplement light to the weightless particles.

[0057] like Figure 4As shown, an elongated slot 14 is formed inside the mounting cover of the flow guide 6. Two sets of sensor mounting seats 4 are installed inside the elongated slot 14. A connecting groove is formed on the sensor mounting seat 4 and a force sensor 5 is installed thereon. A connecting part 15 is integrally formed on the bottom of the connecting plate 13. The connecting part 15 is located inside the elongated slot 14. The connecting part 15 and the sensor mounting seat 4 are located on both sides of the force sensor 5. The length of the connecting part 15 and the sensor mounting seat 4 is less than the width of the elongated slot 14. The length of the elongated slot 14 is parallel to the axis of the working section 1.

[0058] Combination Figure 1 As shown, in this embodiment, simulated seawater with a density close to that of actual seawater is selected as the flow field medium. Polystyrene microspheres are uniformly dispersed in the simulated seawater, and the density of the polystyrene microspheres matches that of the simulated seawater to ensure that they can move synchronously with the flow field medium and truly reflect the flow field state. When the simulated seawater flows over the top surface of the test plate 2 in the test working section 1, the laser emitter 12 and the high-speed motion camera 10 are activated simultaneously. The laser source can illuminate the polystyrene microspheres in the working section 1, and the high-speed motion camera 10 continuously captures the movement trajectory of the microspheres through the transparent observation window 9. The captured data is transmitted to the computer terminal, and after being processed by the flow field analysis software, the flow state of the flow field around the test plate 2 can be intuitively presented, providing visual data support for drag mechanism analysis and drag reduction optimization research.

[0059] This scheme, through the structural design of dual force sensors installed in opposite directions on the Y-axis, can cancel out the interference force in the vertical direction of the Y-axis, retaining only the flow field resistance signal in the horizontal X-axis direction, and can realize high-precision measurement of resistance in water tunnel environment.

[0060] Current underwater 2D and 3D sensors require relatively large installation spaces, while small water holes lack sufficient space, thus hindering the effective characterization of submersible drag. This solution combines miniaturized force sensors with the ability to fit into confined installation spaces, solving the problems of large size, limited installation in small water holes, and large testing errors associated with traditional sensors.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0062] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A precise measurement device for flow field resistance in a water tunnel, comprising a working section (1) and a test plate (2) used in a water tunnel test bench; the working section (1) is used to transport the flow field medium; Its features are: A test assembly for resistance testing of the test plate (2) is installed in the working section (1); The test assembly includes a fixed plate (3); sensor mounting bases (4) are symmetrically fixed on the fixed plate (3), and force sensors are fixedly connected on each of the sensor mounting bases (4). The force sensors are used to detect the force values ​​of the flow field medium in the working section (1) acting on the test plate (2) in the X-axis and Y-axis. Each force sensor (5) is fixedly connected to a connecting plate (13). The test plate (2) and the connecting plate (13) are connected and an adjustment component for adjusting the height of the test plate (2) is installed. Adjacent force sensors are installed with the force measuring direction of the Y axis in opposite directions. The force value output by the force sensor (5) is the resultant force of the X axis and the Y axis.

2. The device for accurately measuring the flow field resistance of a water tunnel according to claim 1, characterized in that, The force sensor is an S-type force sensor (5).

3. The device for accurately measuring the flow field resistance of a water tunnel according to claim 2, characterized in that, The flow field medium is filled with weightless particles.

4. The precise measurement device for flow field resistance based on a water tunnel as described in claim 3, characterized in that, A flow guiding component is provided on the fixed plate (3) to prevent the flow field medium from impacting the force sensor (5); the flow guiding component includes a flow guiding shroud (6) fixedly connected to the fixed plate (3); the flow guiding shroud (6) has an installation groove and a test plate (2) is installed inside it, and the upper surface of the test plate (2) and the upper surface of the flow guiding shroud (6) are at the same level.

5. The precise measurement device for flow field resistance based on a water tunnel as described in claim 4, characterized in that, The adjustment assembly includes several hollow positioning internal threaded tubes (7) that are fixedly connected to the connecting plate (13); the test plate (2) is rotatably fitted with several adjusting bolts (8) that correspond one-to-one with the hollow positioning internal threaded tubes (7), and the bolt body of the adjusting bolt (8) passes through the test plate (2) and is threadedly engaged with the corresponding internal threaded tube (7).

6. The device for accurately measuring the flow field resistance of a water tunnel according to claim 5, characterized in that, The working section (1) has a through hole on its side wall, and a transparent observation window (9) is installed on the through hole. The working section (1) is equipped with an observation component for observing the motion state of weightless particles in the flow field medium within the working section (1); The observation component includes a high-speed motion camera (10) located outside the working section (1). The high-speed motion camera (10) is used to capture the motion state of weightless particles in the flow field medium inside the working section (1) through a transparent observation window (9).

7. The device for accurately measuring the flow field resistance of a water tunnel according to claim 6, characterized in that, An irradiation hole is provided on the top wall of the working section (1), and a transparent irradiation window (11) is installed on the irradiation hole; it also includes an irradiation component for supplementing light to weightless particles in the flow field medium; the irradiation component includes a laser emitter (12) set above the working section (1), the laser emitter (12) is used to emit laser light and shine into the working section (1) through the transparent irradiation window (11).

8. The device for accurately measuring the resistance of a water tunnel flow field according to claim 7, characterized in that, Inside the mounting cover of the fairing (6), there is a waist-shaped long groove (14), and two sets of sensor mounting bases (4) are installed in the waist-shaped long groove (14); a connecting groove is provided on the sensor mounting base (4) and a force sensor (5) is installed thereon. The bottom of the connecting plate (13) is integrally provided with a connecting part (15), which is located in the waist-shaped long groove (14); the connecting part (15) and the sensor fixing seat (4) are located on both sides of the force sensor (5); the length of the connecting part (15) and the sensor fixing seat (4) is less than the width of the waist-shaped long groove (14), and the length of the waist-shaped long groove (14) is parallel to the axis of the working section (1).

9. The device for accurately measuring the resistance of a water tunnel flow field according to claim 8, characterized in that, The weightless particles are one of polystyrene microspheres, hollow glass microspheres, and alumina-modified microspheres.

10. The measurement method based on a precise measuring device for flow field resistance in a water tunnel according to claim 8, characterized in that, Includes the following steps: Step 1: During the test, the water tunnel test bench delivers the flow field medium into the working section (1) to uniformly disperse the weightless particles in the flow field medium. The density of the weightless particles matches the density of the simulated seawater, forming a stable and controllable water flow environment to simulate the flow field conditions when the underwater vehicle is actually sailing. Step 2: Activate the laser emitter (12) and the high-speed motion camera (10). The laser emitted by the laser emitter (12) illuminates the weightless particles in the working section (1). A high-speed action camera (10) continuously captures the motion trajectory of weightless particles through a transparent observation window (9); Step 3: The flow medium flows over the top surface of the test plate (2) and generates resistance; at this time, the S-shaped force sensor (5) symmetrically installed on the fixed plate (3) detects the resultant force in the X-axis and Y-axis directions; The sensor is held horizontally and coaxially on the working section (1) by the sensor mounting bracket (4), and the two sets of force sensors (5) measure force in opposite directions on the Y-axis. The force sensor (5) and the captured data are transmitted to the computer terminal; after being processed by the flow field analysis software, the flow state of the flow field around the test board (2) is presented intuitively. The resistance is transmitted to two S-shaped force sensors (5) through the connecting plate (13). The S-shaped force sensors (5) convert the pressure value into positive and negative electrical signals, forming a positive electrical signal output by the force sensor (5) installed with the force measuring direction in the positive direction of the Y-axis, and a negative electrical signal output by the force sensor (5) installed with the force measuring direction in the opposite direction of the Y-axis. The reverse installation of the two sets of force sensors (5) on the Y-axis results in zero output force on the Y-axis, and only the resultant force value in the horizontal X-axis direction is retained.

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