A constant pressure pulse jet impacting rotating wall particle image velocity measurement experimental device and method

Abstract

The invention relates to a constant-pressure pulse jet impact rotating wall particle image velocity measurement experimental device and method, comprising a variable frequency motor, a coupling, a first axis, a second axis, a disc, an outer square inner circle water tank, a CCD camera, a sheet light source, a laser, a synchronizer, a computer, a copper pipe, a pulse generator, a valve, a flow meter, a constant water tank, a downpipe, a water pump, and a water reservoir; the constant water tank is arranged on the upper side of the water reservoir, and the outer square inner circle water tank is arranged on the side of the water reservoir; the outer square inner circle water tank comprises a square outer water tank and a circular inner water tank, the circular inner water tank is arranged in the square outer water tank, both ends of the circular inner water tank are open, one end of the circular inner water tank is fixed to the square outer water tank, and the other end leaves a gap with the square outer water tank; through the invention, PIV can be accurately, comprehensively and systematically used to study the influence of different Reynolds numbers, impact distances, wall rotation speeds and pulse periods on various flow characteristics in a flow field.

Description

Technical Field

[0001] The invention relates to a constant-pressure pulse jet impacting a rotating wall particle image velocity measurement experimental device and method thereof, which are mainly used for instantaneous velocity measurement of coupled flow of a constant-pressure pulse jet impacting a rotating wall. Background Art

[0002] Pulse jet is a discontinuous jet, which is similar to a bullet. Pulse water jet uses the huge transient energy generated by hydraulic impact - water hammer to achieve the purpose of cutting or crushing materials. Pulse jet can be divided into three types according to its formation method: blocked pulse jet, excitation pulse jet and extrusion impact pulse jet. The research object of this experimental device is blocked pulse jet.

[0003] Jet impacting a rotating wall is widely used in the fields of heating, cooling, and chemistry, such as heat treatment of metal surfaces, cooling of avionics and turbine blades, and chemical vapor deposition. In addition, many machines in life can be roughly regarded as jets impacting a rotating wall, such as jet self-priming pumps. The introduction of pulse factors on the basis of jet impacting a rotating wall causes the flow between the jet and the wall to be complex and violent, the vortex structure changes significantly, and has a high diffusivity and entrainment rate, which can effectively improve the heat transfer process. Therefore, a comprehensive study of the influence of different Reynolds numbers, impact distances, wall rotation speeds, and pulse periods on various flow characteristics in the flow field has important academic significance and engineering application value.

[0004] At present, the existing experimental devices for jet impacting a rotating wall basically have the following characteristics: using single-point measurement technologies such as hot wire hot film anemometer (HWFA) and laser Doppler velocimeter (LDV) to calculate the velocity of particles to achieve non-contact measurement of the flow field. However, it is difficult to achieve transient measurement of the entire flow field. It is impossible to systematically study the effects of different Reynolds numbers, impact distances, and wall speeds on the coupled flow of jet impacting a rotating wall. It is only for continuous impact jets, and no pulse factors are introduced. The jet impact rotating wall experimental devices used in the papers “Development of turbulent impinging jet on a rotating disk” (2004) by Minagawa Y et al. and “Electrochemical mass transfer between animpinging jet and a rotating disk in a confined system” (2007) by N. Şara et al. have characteristics 1, 2, and 3; the jet impact rotating wall particle image velocimetry experimental devices used in the papers “Numerical analysis ofheat transfer on a rotating disk surface under confined liquid jetimpingement” (2006) by Lallave JC et al. and “Particle image velocimetry measurementof jet impingement in a cylindrical chamber with a heated rotating disk” (2013) by Liu YH et al. have characteristics 2 and 3.

[0005] After searching, there is no patent on the experimental device for measuring particle image velocimetry by constant-pressure pulse jet impacting a rotating wall. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the existing technology, the present invention provides a particle image velocimetry experimental device and method for constant-pressure pulse jet impacting a rotating wall in order to study the transient flow structure of a constant-pressure pulse jet impacting a rotating wall. The invention can comprehensively study the influence of different Reynolds numbers, impact distances, wall rotation speeds and pulse periods on various flow characteristics in the flow field.

[0007] The object of the present invention is achieved by a constant pressure pulse jet impact rotating wall particle image velocity measurement experimental device, which is characterized by comprising a variable frequency motor, a coupling, a first axis, a second axis, a disc, an outer square inner circle water tank, a CCD camera, a sheet light source, a laser, a synchronizer, a computer, a copper pipe, a pulse generator, a valve, a flow meter, a constant water tank, a downpipe, a water pump, and a water reservoir;

[0008] The constant water tank is arranged on the top of the water reservoir, and the outer square inner circle water tank is arranged on the side of the water reservoir; the outer square inner circle water tank comprises a square outer water tank and a circular inner water tank, the circular inner water tank is arranged in the square outer water tank, both ends of the circular inner water tank are open, one end of the circular inner water tank is fixed to the square outer water tank, and the other end has a gap with the square outer water tank, and a gap is left between the inner wall of the square outer water tank and the outer wall of the circular inner water tank; a drain port is arranged on the top of the outer square inner circle water tank, and the drain port is located between the inner wall of the square outer water tank and the outer wall of the circular inner water tank, a drain pipe is arranged on the drain port, and the drain pipe is placed on the upper part of the water reservoir;

[0009] The variable frequency motor is located on the side of the outer square inner circular water tank, the first shaft is connected to the variable frequency motor, the second shaft passes through the side of the square outer water tank of the outer square inner circular water tank, and is placed in the circular inner water tank through the opening of the circular inner water tank, the first shaft and the second shaft are connected through a coupling, and a disc is provided at one end of the second shaft located in the circular inner water tank;

[0010] The constant water tank is provided with a constant cavity and an overflow cavity, the top of the constant cavity is provided with an overflow port, the overflow port is provided with an overflow pipe, the constant cavity is connected with the overflow cavity through the overflow port and the overflow pipe; the bottom of the overflow cavity is provided with a downpipe, and the downpipe is located above the water reservoir;

[0011] A copper tube is provided at the bottom of the constant cavity, one end of the copper tube is connected with the constant cavity, and the other end extends from the side of the outer square inner circle water tank facing the water reservoir to the circular inner water tank of the outer square inner circle water tank, and one end of the copper tube placed in the outer square inner circle water tank faces the disc in the circular inner water tank; a flow meter, a valve, and a pulse generator are provided on the copper tube in sequence from the end connected with the constant cavity;

[0012] The water inlet of the water pump is connected to the water reservoir through the water inlet pipe, and the water outlet of the water pump is connected to the constant cavity through the water outlet pipe;

[0013] The CCD camera is arranged in front of or behind the outer side of the outer square inner circle water tank; the light sheet is located outside the top of the outer square inner circle water tank, and the CCD camera and the light sheet are perpendicular to the vertical light curtain emitted from the outer square inner circle water tank below, the light sheet is electrically connected to the synchronizer via the laser, the CCD camera is electrically connected to the synchronizer, and the synchronizer is electrically connected to the computer.

[0014] The copper tube is in an "L" shape, and the horizontal length of the copper tube / the diameter of the copper tube is ≥50, so as to ensure that the fluid is fully developed before being ejected from the copper tube.

[0015] A sliding seal is adopted between the second shaft and the square outer water tank in the outer square inner circle water tank.

[0016] An experimental method for a constant pressure pulse jet impacting a rotating wall particle image velocity measurement experimental device is characterized by:

[0017] Fill the outer square inner circle water tank and the water reservoir with water containing tracer particles, start the variable frequency motor, and drive the disc to rotate through the first shaft, the coupling, and the second shaft; start the water pump, and the water in the water reservoir is transported to the constant cavity of the constant water tank through the water inlet pipe, the water pump, and the water outlet pipe. When there is too much water in the constant cavity, the excess water flows into the overflow cavity through the overflow port and the overflow pipe at the top of the constant cavity, and falls into the water reservoir through the downspout at the bottom of the overflow cavity;

[0018] The water in the constant cavity passes through the copper tube and the flowmeter and valve on the copper tube, and is converted into pulse jets of different frequencies by the pulse generator, which are ejected from the copper tube and impact the wall of the rotating disk, forming a flow field of the entire pulse jet impacting the rotating wall; the laser generated by the laser is irradiated on the middle section of the entire constant pressure pulse jet impacting the rotating wall through a sheet light source, and is photographed by a CCD camera on the side; the CCD camera, sheet light source, laser, synchronizer and computer form a PIV shooting system to achieve flow field velocity measurement of the pulse jet impacting the rotating wall;

[0019] The disc is connected to the variable frequency motor through the second shaft, the coupling, the first shaft, and a sliding seal is used between the second shaft and the outer square inner circle water tank;

[0020] The water in the circular inner water tank in the outer square inner circular water tank flows into the water reservoir through the gap between the circular inner water tank and the square outer water tank, the discharge port and the discharge pipe, and the water pump then transports the water in the water reservoir into the constant cavity of the constant water tank.

[0021] The valve controls the Reynolds number of the pulsed jet R e .

[0022] The variable frequency motor, coupling, first shaft, second shaft and disc form a rotating disc system. A sliding seal is used between the second shaft and the outer square inner circle water tank. The entire rotating disc system can move left and right relative to the outer square inner circle water tank to adjust the impact distance between the copper pipe outlet and the disc wall. H That is, move the frequency conversion motor closer to or away from the outer square inner circle water tank, push or pull the first shaft, coupling, and second shaft, so that the disc moves closer to or away from the copper pipe outlet, and adjusts the impact distance between the copper pipe outlet and the disc wall. H .

[0023] The pulse generator controls the pulse period of the pulse jet T .

[0024] The invention has a reasonable structure. Through the invention, a constant pressure pulse jet impact rotating wall particle image velocity measurement experimental device and method are provided. The device is mainly composed of a frequency conversion motor, a coupling, an axis (a first axis, a second axis), a disc, an outer square inner circle water tank (including a square outer water tank, a circular inner water tank), a CCD camera, a sheet light source, a laser, a synchronizer, a computer, a copper tube, a pulse generator, a valve, a flow meter, a constant water tank, a downpipe, a water pump, and a water reservoir. The jet is ejected from the circular copper tube and impacts the rotating disc wall to form the entire flow field.

[0025] A constant water tank is used to provide power for the pulse jet. The liquid level in the water tank is constant, that is, the pressure is constant, eliminating the pulse interference caused by the pressure pulsation of the power source itself.

[0026] The outer square and inner circle water tank is made of tempered glass. A square water tank is placed outside the circular water tank. The space between the square water tank and the circular water tank is filled with water, which can effectively reduce the error caused by refraction when the laser is directly irradiated on the circular water tank.

[0027] A sliding seal is used between the shaft and the outer square inner circle water tank. The rotating disc system (frequency conversion motor, coupling, shaft and disc) can move left and right to change the distance from the copper tube jet outlet to the disc wall (impact distance H ).

[0028] Through the present invention, a pulse generator is designed, which is essentially a combination of a signal generator and an electromagnetic valve. The opening and closing time of the electromagnetic valve is controlled by the signal generator, thereby forming pulse jets with different frequencies.

[0029] The beneficial results of the present invention are: not only is the operation convenient, but also the ability to accurately, comprehensively and systematically use PIV to study the influence of different Reynolds numbers, impact distances, wall rotation speeds and pulse periods on various flow characteristics in the flow field. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 Top view of the experimental setup of constant-pressure pulse jet impacting a rotating wall.

[0032] Figure 3 for Figure 1 Schematic diagram of the structure of the square inner circle water tank from the left side ( Figure 2 Schematic diagram of the structure of the square inner circle water tank in DD direction).

[0033] In the figure, 1 is a frequency conversion motor, 2 is a coupling, 3-1 is a first axis, 3-2 is a second axis, 4 is a disc, 5 is an outer square and inner circle water tank, 5-1 is a square outer water tank, 5-2 is a round inner water tank, 5-3 is a drain pipe, 6 is a CCD camera, 7 is a light source, 8 is a laser, 9 is a synchronizer, 10 is a computer, 11 is a copper pipe, 12 is a pulse generator, 13 is a valve, 14 is a flow meter, 15 is a constant water tank, 15-1 is a constant cavity, 15-2 is an overflow cavity, 15-3 is an overflow pipe, 16 is a downpipe, 17 is a water pump, 18 is a reservoir, 19-1 is an inlet pipe, and 19-2 is an outlet pipe. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to the accompanying drawings.

[0035] A constant-pressure pulse jet impact rotating wall particle image velocimetry experimental device comprises a variable frequency motor 1, a coupling 2, a first axis 3-1, a second axis 3-2, a disc 4, an outer square inner circle water tank 5, a CCD camera 6, a sheet light source 7, a laser 8, a synchronizer 9, a computer 10, a copper tube 11, a pulse generator 12, a valve 13, a flow meter 14, a constant water tank 15, a downpipe 16, a water pump 17, and a water reservoir 18.

[0036] The constant water tank 15 is arranged on the top of the water reservoir 18, and the outer square inner circle water tank 5 is arranged on the side of the water reservoir 18; the outer square inner circle water tank 5 includes a square outer water tank 5-1 and a circular inner water tank 5-2, the circular inner water tank 5-2 is arranged in the square outer water tank 5-1, and the two ends of the circular inner water tank 5-2 are open, one end of the circular inner water tank 5-2 is fixed to the square outer water tank 5-1, and the other end has a gap with the square outer water tank 5-1, and a gap is left between the inner wall of the square outer water tank 5-1 and the outer wall of the circular inner water tank 5-2; a drain port is arranged on the top of the outer square inner circle water tank 5, and the drain port is located between the inner wall of the square outer water tank 5-1 and the outer wall of the circular inner water tank 5-2, a drain pipe 5-3 is arranged on the drain port, and the drain pipe 5-3 is placed on the upper part of the water reservoir 18.

[0037] The variable frequency motor 1 is located on the side of the outer square inner circular water tank 5, the first shaft 3-1 is connected to the variable frequency motor 1, the second shaft 3-2 passes through the side of the square outer water tank 5-1 of the outer square inner circular water tank 5, and is placed in the circular inner water tank 5-2 through the opening of the circular inner water tank 5-2, the first shaft 3-1 and the second shaft 3-2 are connected through the coupling 2, and a disc 4 is set at one end of the second shaft 3-2 located in the circular inner water tank 5-2.

[0038] A constant chamber 15-1 and an overflow chamber 15-2 are arranged in the constant water tank 15. An overflow port is arranged at the top of the constant chamber 15-1, and an overflow pipe 15-3 is arranged on the overflow port. The constant chamber 15-1 is connected with the overflow chamber 15-2 through the overflow port and the overflow pipe 15-3. A downpipe 16 is arranged at the bottom of the overflow chamber 15-2, and the downpipe 16 is located above the water reservoir 18.

[0039] A copper tube 11 is arranged at the bottom of the constant cavity 15-1, one end of the copper tube 11 passes through the constant cavity 15-1, and the other end extends from the side of the outer square inner circle water tank 5 facing the water reservoir 18 to the circular inner water tank 5-2 of the outer square inner circle water tank 5. One end of the copper tube 11 placed in the outer square inner circle water tank 5 faces the disc 4 in the circular inner water tank 5-2; a flow meter 14, a valve 13, and a pulse generator 12 are arranged on the copper tube 11 in sequence from the end passing through the constant cavity 15-1.

[0040] The water inlet of the water pump 17 is connected to the water reservoir 18 through the water inlet pipe 19-1, and the water outlet of the water pump 17 is connected to the constant cavity 15-1 through the water outlet pipe 19-2. The CCD camera 6 is arranged in front of or behind the outer side of the outer inner circle water tank 5; the sheet light source 7 is located outside the top of the outer inner circle water tank 5, and the CCD camera 6 is perpendicular to the vertical light curtain emitted by the sheet light source 7 to the lower side of the outer inner circle water tank 5, the sheet light source 7 is electrically connected to the synchronizer 9 through the laser 8, the CCD camera 6 is electrically connected to the synchronizer 9, and the synchronizer 9 is electrically connected to the computer 10.

[0041] Furthermore, the shape of the copper tube 11 is "L" shaped, and the horizontal length of the copper tube 11 / the diameter of the copper tube 11 is ≥50, so as to ensure that the fluid is fully developed before being ejected from the copper tube 11. A sliding seal is adopted between the second shaft 3-2 and the square outer water tank 5-1 in the outer square inner circle water tank 5.

[0042] When in use, fill the outer square inner circle water tank 5 and the water reservoir 18 with water containing tracer particles, start the variable frequency motor 1, and drive the disc 4 to rotate through the first shaft 3-1, the coupling 2, and the second shaft 3-2; start the water pump 17, and the water in the water reservoir 18 is transported to the constant chamber 15-1 of the constant water tank 15 through the water inlet pipe 19-1, the water pump 17, and the water outlet pipe 19-2. When there is too much water in the constant chamber 15-1, the excess water flows into the overflow chamber 15-2 through the overflow port and the overflow pipe 15-3 at the top of the constant chamber 15-1, and falls into the water reservoir 18 through the downpipe 16 at the bottom of the overflow chamber 15-2.

[0043] The water in the constant cavity 15-1 passes through the copper tube 11 and the flow meter 14 and valve 13 on the copper tube 11, and is converted into pulse jets of different frequencies by the pulse generator 12, and is ejected from the copper tube 11, impacting the wall of the rotating disk 4, forming a flow field of the entire pulse jet impacting the rotating wall; the laser generated by the laser 8 is irradiated on the middle section of the entire constant pressure pulse jet impacting the rotating wall through the sheet light source 7, and is photographed by the CCD camera 6 on the side; the CCD camera 6, the sheet light source 7, the laser 8, the synchronizer 9 and the computer 10 form a PIV shooting system to realize the flow field velocity measurement of the pulse jet impacting the rotating wall.

[0044] The disc 4 is connected to the variable frequency motor 1 through the second shaft 3-2, the coupling 2, and the first shaft 3-1, and a sliding seal is used between the second shaft 3-2 and the outer square inner circle water tank 5;

[0045] The water in the circular inner water tank 5-2 in the outer square inner circular water tank 5 flows into the water reservoir 18 through the gap between the circular inner water tank 5-2 and the square outer water tank 5-1, the drain port, and the drain pipe 5-3, and the water pump 17 then transports the water in the water reservoir 18 into the constant cavity 15-1 of the constant water tank 15.

[0046] Furthermore, valve 13 controls the Reynolds number of the pulse jet R e The frequency conversion motor 1, coupling 2, first shaft 3-1, second shaft 3-2, and disc 4 form a rotating disc system. A sliding seal is used between the second shaft 3-2 and the outer square inner circle water tank 5. The entire rotating disc system can move left and right relative to the outer square inner circle water tank to adjust the impact distance between the outlet of the copper tube 11 and the disc wall. H That is, by moving the variable frequency motor 1 toward or away from the outer inner circle water tank 5, the first shaft 3-1, the coupling 2, and the second shaft 3-2 can be pushed or pulled to make the disc 4 approach or move away from the outlet of the copper tube 11, and the impact distance between the outlet of the copper tube 11 and the wall of the disc can be adjusted. H The variable frequency motor 1 controls the disc speed. n The pulse generator 12 controls the pulse period of the pulse jet. T .

[0047] In addition, when using:

[0048] a. Each experimental equipment is installed at the designated location according to the above installation method.

[0049] b. Fill the outer square and inner circle water tanks and reservoirs with water containing tracer particles and operate the pump.

[0050] c. After the entire system is running stably, adjust each device in the experimental device to achieve the required test conditions.

[0051] d. Turn on the PIV device, adjust the position of the laser and the viewing angle of the CCD camera, and operate the computer to take pictures.

[0052] Variable parameters of the present invention:

[0053] 1. Reynolds number: adjust the opening and closing degree of the valve and the jet Reynolds number;

[0054] 2. Wall speed: adjust the voltage and frequency of the output power supply through the inverter to change the motor speed;

[0055] 3. Impact distance: adjust the position of the rotating disc system left and right to change the impact distance between the circular copper tube outlet and the disc;

[0056] 4. Pulse cycle: The opening and closing time of the solenoid valve is controlled by a signal generator to form pulse jets with different frequencies.

[0057] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A constant pressure pulse jet impact rotating wall particle image velocity measurement experimental device, characterized in that: It includes a variable frequency motor (1), a coupling (2), a first axis (3-1), a second axis (3-2), a disc (4), an outer square inner circle water tank (5), a CCD camera (6), a sheet light source (7), a laser (8), a synchronizer (9), a computer (10), a copper tube (11), a pulse generator (12), a valve (13), a flow meter (14), a constant water tank (15), a downpipe (16), a water pump (17), and a water reservoir (18); The constant water tank (15) is arranged on the top of the water reservoir (18), and the outer square inner circle water tank (5) is arranged on the side of the water reservoir (18); the outer square inner circle water tank (5) comprises a square outer water tank (5-1) and a circular inner water tank (5-2), the circular inner water tank (5-2) is arranged in the square outer water tank (5-1), both ends of the circular inner water tank (5-2) are open, and one end of the circular inner water tank (5-2) is connected to the square outer water tank (5-1). The outer square water tank (5-1) is fixed, and a gap is left between the other end and the square outer water tank (5-1), and a gap is left between the inner wall of the square outer water tank (5-1) and the outer wall of the circular inner water tank (5-2); a drain port is provided on the top of the outer square inner circular water tank (5), and the drain port is located between the inner wall of the square outer water tank (5-1) and the outer wall of the circular inner water tank (5-2), and a drain pipe (5-3) is provided on the drain port, and the drain pipe (5-3) is placed on the upper part of the water storage tank (18); The variable frequency motor (1) is located on the side of the outer square inner circular water tank (5); the first shaft (3-1) is connected to the variable frequency motor (1); the second shaft (3-2) passes through the side of the square outer water tank (5-1) of the outer square inner circular water tank (5) and is placed in the circular inner water tank (5-2) through the opening of the circular inner water tank (5-2); the first shaft (3-1) and the second shaft (3-2) are connected via a coupling (2); and a disc (4) is provided at one end of the second shaft (3-2) located in the circular inner water tank (5-2); The constant water tank (15) is provided with a constant chamber (15-1) and an overflow chamber (15-2); the top of the constant chamber (15-1) is provided with an overflow port, the overflow port is provided with an overflow pipe (15-3), the constant chamber (15-1) is connected to the overflow chamber (15-2) through the overflow port and the overflow pipe (15-3); the bottom of the overflow chamber (15-2) is provided with a downpipe (16), and the downpipe (16) is located above the water reservoir (18); A copper tube (11) is provided at the bottom of the constant cavity (15-1); one end of the copper tube (11) is connected to the constant cavity (15-1); the other end of the copper tube (11) extends from the side of the outer square inner circle water tank (5) facing the water reservoir (18) to the inner circular water tank (5-2) of the outer square inner circle water tank (5); one end of the copper tube (11) placed in the outer square inner circle water tank (5) faces the disc (4) in the inner circular water tank (5-2); a flow meter (14), a valve (13), and a pulse generator (12) are provided on the copper tube (11) in sequence from the end connected to the constant cavity (15-1); The water inlet of the water pump (17) is connected to the water reservoir (18) through the water inlet pipe (19-1), and the water outlet of the water pump (17) is connected to the constant chamber (15-1) through the water outlet pipe (19-2); The CCD camera (6) is arranged outside the outer square inner circle water tank (5), the light sheet (7) is located outside the top of the outer square inner circle water tank (5), and the CCD camera (6) and the light sheet (7) are perpendicular to the vertical light curtain emitted from the outer square inner circle water tank (5) below, the light sheet (7) is electrically connected to the synchronizer (9) via the laser (8), the CCD camera (6) is electrically connected to the synchronizer (9), and the synchronizer (9) is electrically connected to the computer (10); The shape of the copper tube (11) is "L"-shaped, and the horizontal length of the copper tube (11) / the diameter of the copper tube (11) is ≥50, so as to ensure that the fluid is fully developed before being ejected from the copper tube (11); A sliding seal is used between the second shaft (3-2) and the square outer water tank (5-1) in the outer square inner circle water tank (5).

2. According to claim 1, a constant pressure pulse jet impact rotating wall particle image velocimetry experimental device is characterized in that: The CCD camera (6) is arranged directly in front of or directly behind the exterior of the outer square inner circle water tank (5).

3. The experimental method according to any one of claims 1 to 2, wherein the constant pressure pulse jet impacting the rotating wall particle image velocity measurement experimental device is characterized by: Fill the outer square inner circle water tank (5) and the water reservoir (18) with water containing tracer particles, start the variable frequency motor (1), and drive the disc (4) to rotate via the first shaft (3-1), the coupling (2), and the second shaft (3-2); start the water pump (17), and transport the water in the water reservoir (18) to the constant chamber (15-1) of the constant water tank (15) via the water inlet pipe (19-1), the water pump (17), and the water outlet pipe (19-2); when there is too much water in the constant chamber (15-1), the excess water flows into the overflow chamber (15-2) via the overflow port and the overflow pipe (15-3) at the top of the constant chamber (15-1), and falls into the water reservoir (18) via the downpipe (16) at the bottom of the overflow chamber (15-2); The water in the constant cavity (15-1) passes through the copper tube (11) and the flow meter (14) and valve (13) on the copper tube (11), and is converted into a pulse jet with different frequencies by a pulse generator (12), and is ejected from the copper tube (11) to impact the wall surface of the rotating disk (4), thereby forming a flow field of the entire pulse jet impacting the rotating wall surface; the laser light generated by the laser (8) is irradiated through the sheet light source (7) on the middle section of the entire constant pressure pulse jet impacting the rotating wall surface, and is photographed by the CCD camera (6) on the side; the CCD camera (6), the sheet light source (7), the laser (8), the synchronizer (9) and the computer (10) form a PIV shooting system to achieve velocity measurement of the flow field of the pulse jet impacting the rotating wall surface; The disc (4) is connected to the variable frequency motor (1) via the second shaft (3-2), the coupling (2) and the first shaft (3-1), and a sliding seal is used between the second shaft (3-2) and the outer square inner circle water tank (5); Water in the circular inner water tank (5-2) in the outer square inner circular water tank (5) flows into the water reservoir (18) through the gap between the circular inner water tank (5-2) and the square outer water tank (5-1), the discharge port, and the discharge pipe (5-3), and the water pump (17) then transports the water in the water reservoir (18) into the constant chamber (15-1) of the constant water tank (15).

4. The method according to claim 3, characterized in that: The valve (13) controls the Reynolds number of the pulse jet R e .

5. The method according to claim 3, characterized in that: The variable frequency motor (1), the coupling (2), the first shaft (3-1), the second shaft (3-2), and the disc (4) form a rotating disc system. A sliding seal is used between the second shaft (3-2) and the outer square inner circle water tank (5). The entire rotating disc system can move left and right relative to the outer square inner circle water tank to adjust the impact distance between the outlet of the copper tube (11) and the wall of the disc. H That is, by moving the variable frequency motor (1) toward or away from the outer square inner circle water tank (5), the first shaft (3-1), the coupling (2), and the second shaft (3-2) can be pushed or pulled, so that the disc (4) moves toward or away from the outlet of the copper tube (11), and the impact distance between the outlet of the copper tube (11) and the wall of the disc is adjusted. H .

6. The method according to claim 3, characterized in that: The variable frequency motor (1) controls the rotation speed of the disc n .

7. The method according to claim 3, characterized in that: The pulse generator (12) controls the pulse period of the pulse jet T .

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