Water flow vortex driven shear flow generation experimental device

Abstract

The invention discloses a shear flow generation experimental device driven by a water flow vortex. The shear flow generation experimental device comprises a water flow injection system and a water flow discharge system which are mounted on a vortex generation system, when the water injection valve is opened, water flow enters the water injection pipeline, is guided into the upper guide rail through the water injection hole, falls into the lower guide rail after being accumulated and overflowed in the upper guide rail and uniformly flows down along the wall surface through the open groove in the edge of the barrel wall, and injected fluid is far away from the water surface of the vortex core, so that the vortex stability is prevented from being influenced. The water delivery valve is opened, water in the barrel is in a drainage state in the process that water flow in the barrel flows out through the drainage hole, and non-spinning point convergence is formed under the action of gravity. Meanwhile, under the action of the Coriolis force, a rotating point vortex is formed on the water surface. The water surface shear flow vortex is formed by superposing a point vortex and a point sink. The device is large in shear flow basin, clear in principle and simple and reliable in structure, and can provide large enough shear flow to provide a required test environment for a structural model.

Description

Technical Field

[0001] The invention belongs to the field of fluid experimental equipment, and in particular relates to a shear flow generation experimental device driven by a water vortex. Background Art

[0002] Shear flow is a flow mode with a lateral velocity gradient field. It plays an important role in the study of the hydrodynamic performance of underwater vehicles such as torpedoes and UUVs. It is also an environmental factor that cannot be ignored in the actual marine environment. However, most underwater explosion spark bubble tests are currently unable to consider the effect of shear flow. Since most experiments on shear flow are difficult to implement, many scholars have numerically simulated the state of objects in shear flow. At present, the experimental equipment for studying shear flow environment is mainly rheometers, but although rheometers have high accuracy, they cannot meet the environmental size requirements for large-scale experiments. Such large-scale shear flow generating devices are needed to realize experimental simulations of objects in shear flow simulation. Summary of the invention

[0003] The purpose of the present invention is to.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A shear flow generation experimental device driven by a water vortex comprises a water flow injection system and a water flow discharge system, and a PIV observation system installed on a vortex generation system; the vortex generation system comprises a water injection port connected to the water flow injection system, a vortex generation barrel, a drainage hole connected to the water flow discharge system, a vortex generation barrel bracket, an upper guide rail and a lower guide rail; a vortex generation barrel bracket is installed below the vortex generation barrel, and a double-layer guide rail is embedded on the inner side wall, the upper guide rail is lower than the water injection port, is obliquely arranged on the barrel wall and is completely connected to the barrel wall, and after the water enters the water flow injection system, it is introduced into the upper guide rail through the water injection hole, and is stored in the upper guide rail After overflowing, the water flows into the lower rail through the vertical downward drainage chamfer set on the edge of the rail; the lower rail is intermittently provided with grooves at the connection with the barrel wall, so that the water flow in the lower rail flows down evenly along the wall surface and away from the water surface at the center of the vortex to avoid affecting the stability of the vortex; finally, the water flows into the water discharge system through the drainage hole and then is discharged; in the process of the water flow in the barrel flowing out through the drainage hole, the water in the barrel forms a vortex-free point sink due to the action of gravity in the drainage state, and at the same time, under the action of Coriolis force, a vortex with vortex will be formed on the water surface; the vortex with vortex and the vortex-free point sink are superimposed to form a water surface shear flow vortex, and the PIV observation system is used to observe the shear flow.

[0006] Furthermore, the water injection system includes a water injection pipeline and a water injection valve installed on the pipeline, and the water injection valve controls the water flow rate; the water discharge system includes a drainage pipeline and a water delivery valve installed on the pipeline, and the water delivery valve controls the water flow rate; the diameter of the water injection pipeline is D 注水Larger than the drainage pipe diameter D 排水 , the upper limit of water injection capacity per unit time is greater than the upper limit of water discharge capacity; the valve controls the water injection and discharge volume per unit time.

[0007] Furthermore, the inner diameter of the lower guide rail is smaller than that of the upper guide rail; the upper guide rail is completely connected to the barrel wall, so that its distance from the lower bottom is H4, the vertical height of the inclined surface is h4, and it forms an angle of 60° with the horizontal; water accumulates in the upper guide rail and overflows and falls into the lower guide rail; the distance between the lower guide rail and the barrel wall and the lower bottom is H5, the verticality of the inclined surface height is h5, and it forms an angle of 45° with the horizontal; wherein, H4<H5, h4<h5.

[0008] Furthermore, the lower guide rail on the edge of the barrel wall is slotted at equal intervals to evenly distribute the water flow; each slot is trapezoidal, and the width does not exceed 5%-10% of the total circumference of the barrel wall.

[0009] Furthermore, the point sink is a liquid that flows radially into the pole and is discharged, and the flow rate per unit time is Q; the point vortex is a liquid that does not flow radially, and the streamlines are concentric circles with the center at the pole. According to the Helmholtz theorem, the velocity circulation of each streamline on the water vortex is a constant Γ; the velocity field distribution of the water surface shear flow basin is: Where V is the flow rate at the outlet, V r is the radial velocity, V θ is the tangential velocity, Q is the flow rate per unit time, and Γ is the velocity circulation.

[0010] Furthermore, a test object or a 220V underwater low-voltage electric spark generating device is suspended above the vortex generating barrel. During the experiment, the test object or the 220V underwater low-voltage electric spark generating device is placed at different positions of the test area in the water in the barrel, and shear flows of different speeds are obtained by observation through PIV technology.

[0011] The test area is far away from the boundary layer and the vortex core; the thickness of the boundary layer is:

[0012]

[0013] Where Re is the Reynolds number, d is the characteristic length, λ is the friction factor of the barrel wall, δ is the boundary layer thickness, v is the flow velocity of the shear flow at the barrel wall, μ is the viscosity coefficient, and ρ is the density of water;

[0014] The vortex core radius is:

[0015]

[0016] Where, τ is the shear stress;

[0017] The test area is:

[0018]

[0019] Where D3 is the barrel diameter at the corresponding position of the test height;

[0020] On the water surface where the vortex is located, the test radius is:

[0021]

[0022] Furthermore, the water injection pipe, the vortex generating barrel and the drainage pipe are all made of acrylic material.

[0023] The beneficial effects of the present invention are:

[0024] The present invention can generate a shear flow with controllable flow rate. At the same time, the generation principle is clear, the generation equipment structure is simple, the effect is obvious, and the size is large. The state characteristics of large objects in the shear flow can be experimented. The shear flow is stable and controllable, which provides convenience for various shear flow related experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a shear flow generating device driven by a water vortex;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of a shear flow generating device driven by a water vortex;

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of the double-layer guide rail and the water injection pipe;

[0028] Figure 4 is a schematic diagram of the test area at the water surface in the barrel.

[0029] Figure 5 It is a schematic diagram of the experiment to observe the motion state of fluid under the influence of an object.

[0030] Figure 6 It is a schematic diagram of 220V underwater low-voltage electric spark bubble test in shear flow. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with the accompanying drawings.

[0032] See attached Figures 1 to 4The present invention is a shear flow generating device driven by water vortex, comprising a water injection valve 1, a water injection pipe 2, a water injection port 3, a vortex generating barrel 4, a drainage hole 5, a vortex generating barrel bracket 6, a water delivery valve 7, a drainage pipe 8, an upper guide rail 9, a lower guide rail 10 and a PIV observation system. A vortex generating barrel bracket 6 is installed under the vortex generating barrel 4, and the vortex generating barrel bracket 6 is placed on the ground. When the water injection valve 1 is opened, the water flows into the water injection pipe 2, and is guided into the upper guide rail 9 through the water injection hole 3. After the water overflows from the upper guide rail 9, it falls into the lower guide rail 10. The water flows through the grooves at the edge of the barrel wall and flows down evenly along the wall surface. The injected fluid is away from the water surface at the vortex center, thereby avoiding affecting the vortex stability. A drainage hole 5 is opened at the bottom of the vortex generating barrel 4, and the radius of the drainage hole 5 is smaller than the radius of the water injection hole 3. When the water delivery valve 7 is opened, the water in the barrel is in a drainage state during the process of flowing out through the drainage hole 5, and a vortex point sink is formed due to gravity. At the same time, under the action of Coriolis force, a vortex will form on the water surface. The vortex of shear flow on the water surface is formed by the superposition of a point vortex and a point sink. For a point sink, the liquid flows radially into the pole and is discharged, and the flow rate per unit time is Q; while for a point vortex, the liquid does not flow radially, and the streamlines are concentric circles with the center at the pole. According to the Helmholtz theorem, the velocity circulation of each streamline on the water vortex is a constant Γ.

[0033] The water vortex is formed by the superposition of point sinks and point vortices. The velocity field distribution of the water surface shear flow basin can be described as: Where V r is the radial velocity, V θ is the tangential velocity, Q is the flow rate per unit time, and Γ is the velocity circulation. The flow velocity V at the drain outlet is obtained according to the liquid level, and the flow rate Q is obtained in combination with the drain outlet diameter. The velocity circulation Γ is obtained according to the simulation software.

[0034] The present invention uses gravity and Coriolis force to form a vortex, thereby obtaining a shear flow driven by the vortex. At the same time, the valve can be used to control the water flow rate to meet the flow rate requirements of different tests. According to the vortex theorem, the point vortex formed by the Coriolis force will not change with time under ideal conditions, that is, it can maintain a stable tangential velocity of the water flow vortex in the bucket under low displacement conditions. The test area in the vortex generation bucket is far away from the boundary layer and the vortex center. The boundary layer thickness is Among them, Re is the Reynolds number, d is the characteristic length, λ is the friction factor of the barrel wall, δ is the boundary layer thickness, v is the flow velocity of the shear flow at the barrel wall, μ is the viscosity coefficient, and the vortex core radius is On the water surface where the vortex is located, the test radius is In addition, the device has a large volume, which can facilitate experiments on larger objects in shear flow.

[0035] The water injection pipe 2, the vortex generating barrel 4 and the drainage pipe 9 of the present invention are all made of acrylic material. Acrylic material has good transparency, chemical stability and weather resistance, and can improve the observability of the fluid and the objects in the fluid.

[0036] The calculation method of the test radius of the present invention is:

[0037] The shear flow generating device is a trapezoidal cylindrical barrel with a wide top and narrow bottom, with an upper bottom diameter D1, a lower bottom diameter D2, a height H1, a liquid level height H2, a test height H3, and a water injection hole diameter d in , drainage hole diameter d out , water injection volume Q in , displacement Q out , the viscosity coefficient of water ν.

[0038] The calculation method of radial velocity and tangential velocity is as follows:

[0039] The barrel diameter at the test height:

[0040] The radius of the barrel at the test height: R3 = D3 / 2;

[0041] Radial velocity at test height 0.5 m:

[0042] Radial velocity at the drain outlet:

[0043] Speed ​​circulation:

[0044] Tangential speed:

[0045] The boundary layer thickness is calculated as follows:

[0046] The formula for boundary layer thickness is:

[0047] Where: the friction factor of the barrel wall is λ; the characteristic length d = D3; the speed v = V θ ; Reynolds number is

[0048] Substituting into the boundary layer thickness formula:

[0049]

[0050] The calculation method of vortex core radius is as follows:

[0051] Drainage outlet radius: r out =d out / 2

[0052] Velocity at vortex center:

[0053] The formula for the vortex core radius is:

[0054] Among them, τ is the shear stress, generally taken as τ = 1Pa.

[0055] The calculation method for the area range that can be used for shear flow testing is as follows:

[0056] The test area is:

[0057]

[0058] The overall structural dimension design of the shear flow generation experimental device driven by water vortex in the present invention is as follows: Assuming that an electric spark bubble test is carried out in the device, the radius range of the bubble generated is required to be R max ∈(R max1 ,R max2 ), to avoid the influence of the structural wall on the bubble, the distance between the structural wall and the bubble center / the maximum radius of the bubble should be greater than 4 times, that is, (D3 / 2) / R max >4. Since the wall effect of the shear flow generation experimental device also needs to consider the boundary layer thickness and the vortex core radius, the distance from the structure wall to the bubble center / the maximum radius of the bubble should be greater than 5 times, that is, (D3 / 4) / R max >5,(H3 / 2) / R max >5. Barrel diameter at the test height: D3>20R max2 ; Test height: H3>10R max2。

[0060] In order to improve the utilization efficiency of the device, it can be set to 1.2<D1 / D2<1.5, 1.3

[0061] H2 / H3=2.

[0062] The design of the dimensions of the water injection hole 2 and the drainage hole 5 of the present invention is based on the overall structural dimensions of the shear flow generating device described above, so that the device can generate shear flow that meets the following conditions: radial velocity V r ∈(V r1 , V r2 ), tangential velocity V θ ∈(V θ1 , V θ2 ). To maintain the stability of the flow field, it is recommended that V r / V θ ∈(0.1, 0.2). The radius of the bucket at the test height is: R3 = D3 / 2.

[0063] ​In order to keep the fluid in the barrel highly stable, the water injection volume and the drainage volume must be kept equal. The diameter of the water injection hole and the drainage hole must be determined based on the water injection volume and the drainage volume.

[0064] Flow Q:

[0065] Velocity circulation: Γ=Γ out =2π(d out / 2)V rout

[0066] The velocity circulation is determined by the tangential velocity:

[0067] Γ=Γ out =2π(D3 / 2)V θ ∈(2π(D3 / 2)V θ1 ,2π(D3 / 2)V θ2 )

[0068] Combining two formulas:

[0069] get

[0070] The injection hole is larger than the drainage hole. Assuming that the water flow velocity V of the injection hole is known in .

[0071] Calculation of injection hole diameter: Arranged

[0072] Substitute the data:

[0073] Therefore, the diameters of the injection and drainage holes are:

[0074]

[0075] The design of the double-layer guide rail size of the present invention is based on the overall structural size of the above-mentioned shear flow generation experimental device and the diameters of the water injection hole 3 and the drainage hole 5. The connection of the upper guide rail 9 must be lower than the water injection hole 3, and the inner diameter of the lower guide rail 10 must be smaller than that of the upper guide rail 9.

[0076] The upper rail 9 is completely connected to the barrel wall, and the distance from the lower bottom is H4, the height of the slope (vertical) is h4, and the angle with the horizontal is 60°. Water accumulates in the upper rail 9 and overflows and falls into the lower rail 10, so the inner diameter of the lower rail 10 should be smaller than the upper rail 9. The distance from the lower rail 10 to the barrel wall is H5, the height of the slope (vertical) is h5, and the angle with the horizontal is 45°, where H4<H5, h4<h5.

[0077] The present invention makes slots at equal intervals on the lower rails at the edge of the barrel wall, so that the water flow can be evenly distributed through the slots, avoiding concentrated injection at a certain position, thereby ensuring symmetrical flow distribution on the entire water surface. This helps to form a stable vortex structure and avoid disturbance. The trapezoidal slot design of wide top and narrow bottom can control the gradual contraction of the water flow, avoid turbulence, and optimize the state of the water flow entering the barrel wall.

[0078] It is recommended that the width of each slot should not exceed 5%-10% of the total circumference of the barrel wall to ensure uniform flow distribution. It is recommended that the ratio of the upper width to the lower width of the trapezoidal slot be 1.2:1 or 1.5:1. The number of slots can be selected according to the diameter of the barrel wall, usually between 4 and 12 is more suitable.

[0079] When the number of slots is 12, the ratio of the upper width to the lower width of the trapezoidal slot is 1.5:1 for slot design.

[0080] Diameter of lower rail:

[0081] Trapezoidal slot upper width:

[0082] Trapezoidal slot bottom width:

[0083] The present invention can be used for designing the area range of a shear flow test. According to the above design basis, the boundary layer thickness and the vortex core radius range can be calculated.

[0084] Reynolds number:

[0085] Substituting into the boundary layer thickness formula:

[0086] Assuming the shear stress τ = 1Pa, the formula for the vortex core radius is:

[0087] The test area is:

[0088]

[0089] The present invention provides a water vortex driven shear flow generation experimental method, which can carry out two types of experiments:

[0090] according to Figure 5 As shown, the name of the test is: Observation test of fluid motion state under the influence of objects. The specific steps are as follows:

[0091] Step 1: Equipment Preparation

[0092] 1) Shear flow generating device, including vortex generating barrel, water injection device, drainage system, guide rail structure, etc.

[0093] 2) The test object is hoisted above the vortex generating barrel and its position can be adjusted.

[0094] 3)PIV system, including laser light source, high-speed camera, and particle tracer.

[0095] Step 2: Test flow field generation

[0096] Open the water filling valve, and water is evenly injected into the vortex generating barrel through the guide rail; the guide rail grooves on the barrel wall ensure that the water flows evenly along the barrel wall and slides down; open the drain valve, and the drain hole (smaller than the radius of the water filling port) forms a point sink, and the water flows radially toward the center of the barrel bottom; due to the point sink at the bottom of the barrel and the Coriolis force, shear flow and vortex are formed on the water surface in the barrel.

[0097] Step 3: Experiment with object placement

[0098] 1) Adjust the height of the object from the bottom of the barrel to simulate different laminar shear strengths;

[0099] 2) Place objects at different radial positions in the barrel to study the effect of flow field position on shear flow.

[0100] Step 4: PIV Observation

[0101] 1) Flow field particle distribution: Add tracer particles, such as micron-sized polystyrene particles, to the water to ensure uniform distribution and movement with the fluid.

[0102] 2) Laser illumination: The laser light sheet is projected vertically into the fluid, and a specific cross section (such as near the water surface or near the barrel wall) is selected.

[0103] 3) High-speed imaging: A high-speed camera captures the motion of tracer particles within a short time interval.

[0104] Step 5: Data Analysis

[0105] 1) Use PIV software to analyze the particle motion of two frames of images and obtain the velocity vector field.

[0106] 2) Analyze the velocity distribution, vortex structure and shear strength of the fluid in the barrel.

[0107] according to Figure 6 As shown, the test name 2: 220V underwater low-voltage electric spark bubble test in shear flow, the specific steps are as follows:

[0108] Step 1: Equipment Preparation

[0109] 1) Shear flow generating device, including vortex generating barrel, water injection device, drainage system, guide rail structure, etc.

[0110] 2) 220V underwater low-voltage electric spark generating device, including test bracket, discharge electrode and power supply.

[0111] 3) Image data acquisition equipment, including high-speed cameras, wide-angle lenses, LED light sources, and rulers.

[0112] 4) Pressure acquisition equipment, including piezoelectric sensor, charge amplifier, and oscilloscope.

[0113] 5) Experimental data acquisition and analysis system.

[0114] Step 2: Test flow field generation

[0115] Open the water filling valve, and water is evenly injected into the vortex generating barrel through the guide rail; the guide rail grooves on the barrel wall ensure that the water flows evenly along the barrel wall and slides down; open the drain valve, and the drain hole (smaller than the radius of the water filling port) forms a point sink, and the water flows radially toward the center of the barrel bottom; due to the point sink at the bottom of the barrel and the Coriolis force, shear flow and vortex are formed on the water surface in the barrel.

[0116] Step 3: Placement of test equipment

[0117] Set up high-speed cameras, connect lines, and check the lines between various devices;

[0118] The ends of the high-voltage working area are connected with copper wires with a diameter of 0.5 mm. Before the experiment, the positive and negative copper wires are put together to ensure that the detonation point is at the contact point of the positive and negative copper wires;

[0119] Place pressure sensors at designated locations;

[0120] Turn on the LED light source, adjust the position and resolution of the high-speed camera and the focal length of the optical lens to achieve the best image quality, and place a ruler for shooting as a size reference;

[0121] Put the high-speed camera and data acquisition card in standby mode, and send a forced trigger signal from the oscilloscope to ensure that the high-speed camera shooting and the discharge electrode discharge are triggered at the same time, and the whole experimental system works normally;

[0122] Step 4: Bubble Generation and Data Collection

[0123] Put the high-speed camera, data acquisition card and oscilloscope in the trigger state, close the main switch and charging switch, charge the capacitor to 220V, close the safety switch, and disconnect the charging switch and main switch;

[0124] Before pressing the discharge switch, check again that the high-speed camera, data acquisition card and oscilloscope are in the trigger state. Press the discharge switch, the discharge electrode discharges, and bubbles are generated.

[0125] After the capacitor is discharged to zero, disconnect the safety switch, turn off the LED light source, and save the video of the bubble pulsation image and the data collected by the data acquisition card into a folder.

[0126] Step 5: Data Analysis

[0127] 1) Analyze the captured bubble pulsation image videos and observe the evolution of bubbles over time in different shear flows.

[0128] 2) Analyze the collected pressure data to obtain the influence of shear flow on bubble pulsation pressure.

[0129] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A water vortex driven shear flow generation experimental device, characterized in that: The invention comprises a water flow injection system and a water flow discharge system, and a PIV observation system installed on a vortex generation system; the vortex generation system comprises a water injection port (3) connected to the water flow injection system, a vortex generation barrel (4), a drainage hole (5) connected to the water flow discharge system, a vortex generation barrel bracket (6), an upper guide rail (9) and a lower guide rail (10); a vortex generation barrel bracket (6) is installed below the vortex generation barrel (4); a double-layer guide rail is embedded on the inner side wall, and the height of the upper guide rail (9) is lower than the water injection port (3). The water flows into the water injection system through the water injection hole (3) and then flows into the upper guide rail (9). After the water flows into the upper guide rail (9), it overflows and flows into the lower guide rail (10) through the vertical downward drainage chamfer provided on the edge of the guide rail. The lower guide rail (10) is provided with slots intermittently at the connection with the barrel wall, so that the water flows in the lower guide rail (10) evenly along the wall surface and away from the water surface at the vortex center, thereby avoiding affecting the stability of the vortex. Finally, the water flows into the water discharge system through the drainage hole (5) and then is discharged. When the water in the bucket flows out through the drain hole (5), the water in the bucket forms a vortex-free sink due to gravity in the drainage state. At the same time, under the action of the Coriolis force, a vortex-free vortex is formed on the water surface. The vortex-free vortex and the vortex-free sink are superimposed to form a shear flow vortex on the water surface. The PIV observation system is used to observe the shear flow.

2. The shear flow generation experimental device driven by water vortex according to claim 1, characterized in that: The water injection system comprises a water injection pipeline (2) and a water injection valve (1) installed on the pipeline, and the water injection valve (1) controls the water flow rate; the water discharge system comprises a drainage pipeline (8) and a water delivery valve (7) installed on the pipeline, and the water delivery valve (7) controls the water flow rate; the water injection pipeline (2) has a diameter D 注水 Larger than the diameter D of the drainage pipe (8) 排水 , the upper limit of water injection capacity per unit time is greater than the upper limit of water discharge capacity; the valve controls the water injection and discharge volume per unit time.

3. The shear flow generation experimental device driven by water vortex according to claim 1, characterized in that: The inner diameter of the lower guide rail (10) is smaller than the inner diameter of the upper guide rail (9); the upper guide rail (9) is completely connected to the barrel wall, so that its distance from the bottom is H4, the vertical height of the inclined surface is h4, and it forms an angle of 60° with the horizontal; water accumulates in the upper guide rail and overflows and then falls into the lower guide rail; the distance between the lower guide rail (10) and the barrel wall at the connection point is H5 from the bottom, the verticality of the inclined surface height is h5, and it forms an angle of 45° with the horizontal; wherein, H4<H5, h4<h5.

4. The shear flow generation experimental device driven by water vortex according to claim 1, characterized in that: The lower guide rail (10) on the edge of the barrel wall is slotted at equal intervals to evenly distribute the water flow; each slot is trapezoidal, and the width does not exceed 5%-10% of the total circumference of the barrel wall.

5. The shear flow generation experimental device driven by water vortex according to claim 1, characterized in that: For the point sink, the liquid flows radially into the pole and is discharged, and the flow rate per unit time is Q; for the point vortex, the liquid does not flow radially, and the streamlines are a family of concentric circles with the center at the pole. According to the Helmholtz theorem, the velocity circulation of each streamline on the water vortex is a constant Γ; the velocity field distribution of the water surface shear flow basin is: Where V is the flow rate at the outlet, V r is the radial velocity, V θ is the tangential velocity, Q is the flow rate per unit time, and Γ is the velocity circulation.

6. The shear flow generation experimental device driven by water vortex according to claim 1, characterized in that: A test object or a 220V underwater low-voltage electric spark generating device is suspended above the vortex generating barrel (4). During the experiment, the test object or the 220V underwater low-voltage electric spark generating device is placed at different positions of the test area in the water in the barrel, and shear flows of different speeds are obtained through PIV technology observation.

7. The water vortex driven shear flow generation experimental device according to claim 6, characterized in that: The test area is far away from the boundary layer and the vortex core; The boundary layer thickness is: Where Re is the Reynolds number, d is the characteristic length, λ is the friction factor of the barrel wall, δ is the boundary layer thickness, v is the flow velocity of the shear flow at the barrel wall, μ is the viscosity coefficient, and ρ is the density of water; The radius of the vortex core is: Where, τ is the shear stress; The test area is: Where D3 is the barrel diameter at the corresponding position of the test height; On the water surface where the vortex is located, the test radius is:

8. The water vortex driven shear flow generation experimental device according to claim 1, characterized in that: The water injection pipe (2), the vortex generating barrel (4) and the drainage pipe (8) are all made of acrylic material.

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