Synchronous tracking and measuring device for mechanical flow field of rotary PIV (particle image velocimetry) impeller fluid

Abstract

The invention belongs to the field of water tunnel and wind tunnel tests, and particularly relates to a rotary PIV impeller fluid mechanical flow field synchronous tracking measurement device. A rotary PIV impeller fluid mechanical flow field synchronous tracking and measuring device comprises a water tunnel device, and further comprises a rotating device, a measuring device and a phase locking device, the rotating device is sleeved with the water tunnel device, a rotating signal connector is arranged in an outer transmission shaft, a rotating laser guide path is arranged in the signal connector, a gear is arranged at the tail end of the outer transmission shaft, and the rotating laser guide path is connected with the rotating signal connector. The gear is connected with an external driving motor; the measuring device is sleeved in the position of the test section and comprises a PIV camera assembly; the phase locking device is of a cylindrical structure and is arranged outside the water tunnel device in a sleeving mode, the inner wall of the outer end of the phase locking device is connected with the wire conduit of the rotating device, and the inner wall of the inner end of the phase locking device is connected with the PIV camera assembly of the measuring device. The device can realize the synchronous tracking measurement of the mechanical flow field of the rotating impeller fluid, and improves the integrity and continuity of the test.

Description

Technical Field

[0001] The invention belongs to the field of water tunnel and wind tunnel tests, and in particular relates to a synchronous tracking and measuring device for a rotary PIV impeller fluid mechanical flow field. Background Art

[0002] High-speed water tunnels and wind tunnel laboratories provide an ideal platform for studying the behavior of fluids under different conditions. By simulating high-speed flow, researchers can observe the flow characteristics of fluids, turbulence phenomena, and the interaction between fluids and solids. PIV technology, or particle image velocimetry, is a non-contact method for measuring fluid velocity fields. It disperses tiny tracer particles in the fluid, illuminates these particles with a laser light source, and then uses a high-speed camera to capture the scattered light image of the particles moving in the fluid, and then analyzes the displacement of the particles to calculate the velocity field of the fluid.

[0003] PIV technology is widely used in fluid mechanics research, aerospace, energy engineering, ship engineering, power machinery engineering and other fields, and is used to study complex rotational flow phenomena, optimize design, verify numerical simulation results, etc. When used in fluid mechanics experiments for aircraft, underwater vehicles, etc., in order to observe the flow field changes near the surface of objects such as propellers, fighter rolls, stall spins, etc. under rotating conditions, when using the PIV flow field test and display system in the existing technology, the camera in the test device is fixed, which has limitations in the measurement of the flow field. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a rotating PIV impeller fluid machinery flow field synchronous tracking measurement device, in which the measuring device can rotate stably to achieve synchronous tracking measurement of the entire flow field, thereby improving the integrity and continuity of the test.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: a rotating PIV impeller fluid machinery flow field synchronous tracking and measurement device, including a water tunnel device, a rotating device, a measuring device and a phase-locking device. The water tunnel device is provided with a contraction section, a test section and an expansion section from front to back, and an assembly groove is provided at the rear end of the expansion section.

[0006] The rotating device is mounted in the test section and expansion section of the water tunnel device, and includes an outer transmission shaft. The outer transmission shaft is a hollow structure. A rotating signal connector is arranged inside the outer transmission shaft, a rotating laser guide is arranged in the rotating signal connector, and a gear is arranged at the end of the outer transmission shaft, and the gear is connected to an external drive motor; a forked interface is arranged at the front end of the outer transmission shaft, and a circular rotating slide perpendicular to the forked interface is arranged at the forked interface, and the circular rotating slide is fixedly installed on the assembly groove of the water tunnel device, and a rotating slide is movably connected to the inner side of the circular rotating slide, and a wire tube is connected to the inner side of the rotating slide, and the other end of the wire tube is connected to the forked interface, and a wire is arranged in the wire tube, and the wire in the wire tube is electrically connected to the rotating laser guide in the rotating signal connector; an inner transmission shaft is connected to the front end of the forked interface, and a propeller is arranged at the front end of the inner transmission shaft.

[0007] Preferably, the rotating signal connector comprises a male connector and a female connector which cooperate with each other, the diameter of the front end of the male connector gradually decreases; the interior of the female connector is hollow to form a cavity with a gradually decreasing diameter, a signal transmission slip ring is arranged on the inclined surface where the male connector and the female connector are connected, and when the male connector and the female connector are tightly connected, the signal is transmitted through the signal transmission slip ring, a rotating laser guide is arranged in the male connector and the female connector, a forked laser reflection guide is arranged at the forked interface, and the laser guide is electrically connected to the wire in the wire tube at the forked interface through the forked laser reflection guide.

[0008] Preferably, a circular support slide is mounted on the outer side of the middle of the inner transmission shaft, the circular support slide is connected to the inner wall of the expansion section of the water tunnel device, a support slide is arranged on the inner side of the circular support slide, the support slide rotates in the circular support slide; a plurality of support rods are connected to the inner side of the support slide, the support rods are gathered at the inner support ring, and the support ring is fixedly connected to the inner transmission shaft. By setting up the circular support slide, the abnormal lateral swing of the outer transmission shaft and the inner transmission shaft during high-speed rotation can be reduced. The measuring device is mounted in the test section of the water tunnel device. The measuring device includes a camera translation track and a circular measuring slide arranged on the camera translation track. A measuring slide is movably connected to the inner side of the circular measuring slide, and a PIV camera assembly is arranged on the measuring slide.

[0009] Preferably, the PIV camera assembly includes a camera connecting frame, a camera rotating frame, a camera base, a PIV camera and a counterweight. The camera connecting frame is fixed to the inner side of the measuring slide through a camera slide. The camera rotating frame is hinged to the camera connecting frame. The camera base is connected to the camera rotating frame. The PIV camera is fixed on the camera base. Counterweights are arranged at intervals on the inner side of the rotating slide and at evenly distributed positions of the PIV camera.

[0010] Preferably, a camera trapezoidal slider is provided on the camera base, and a matching camera trapezoidal slide groove is provided on the camera rotating frame. The camera base and the camera rotating frame are connected by the camera trapezoidal slider and the camera trapezoidal slide groove, and are fixed by a camera buckle provided on the camera rotating frame; a square wire opening is opened on the side of the camera connecting frame.

[0011] The phase-locking device is a cylindrical structure, which is mounted on the outside of the test section and expansion section of the water tunnel device. The inner walls at both ends of the phase-locking device are respectively connected to the wire tube of the rotating device and the PIV camera assembly of the measuring device. The external drive motor drives the external transmission shaft and the forked interface to rotate, and the wire tube rotates on the circular rotating slide, thereby driving the phase-locking device to rotate. The phase-locking device drives the PIV camera assembly to rotate on the circular measuring slide.

[0012] Preferably, the phase-locking device is a telescopic structure, including a primary cylinder, a secondary cylinder and a tertiary cylinder, the adjacent cylinders are slidably connected, and inner and outer cylinder wire grooves are respectively provided on the inner and outer walls of the primary cylinder, the secondary cylinder and the tertiary cylinder. The wires at the wire tube are fixed in the inner wire grooves of the cylinder through wire holes at the outer wire grooves of the cylinder, and are connected to the PIV camera from the square wire port on the measuring device.

[0013] More preferably, the primary cylinder of the phase-locking device is connected to the wire tube, and the tertiary cylinder of the phase-locking device is connected to the PIV camera assembly.

[0014] Preferably, the rotating laser guide, male connector, female connector and external transmission shaft are concentrically nested and connected, and the end faces of the rotating laser guide, male connector, female connector and external transmission shaft are aligned on the side away from the gear.

[0015] Preferably, the rotating device, the measuring device and the phase-locking device rotate coaxially and synchronously when driven by an external driving motor.

[0016] The beneficial effects of the present invention are: 1. The outer transmission shaft drives the wire tube to rotate coaxially and synchronously, the wire tube drives the phase-locking device to rotate, and the phase-locking device drives the PIV camera to rotate, so as to realize the synchronous rotation of the entire device, and the measurement of the rotational flow field can be realized. 2. The rotating signal connector is rotationally locked with the outer transmission shaft, and the male connector and the female connector are stably connected by mutual cooperation and insertion, and the signal transmission is realized by the signal transmission slip ring distributed on the narrow and long inclined surface, which improves the reliability of signal transmission and can realize the synchronous tracking measurement of the high-speed rotating flow field. 3. The setting of the circular rotating track and the circular measuring slideway ensures the stability of the entire equipment during high-speed rotation and reduces the interference with the flow field image results during the rotation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the water tunnel device of the present invention; Figure 3 It is a schematic diagram of the structure of the rotating device and the measuring device of the present invention; Figure 4 It is a partial perspective structural diagram of the water tunnel device wall of the present invention; Figure 5 This is a schematic diagram of the phase-locked barrel structure of the present invention; Figure 6 It is a schematic diagram of the overall structure of the rotating device of the present invention; Figure 7 It is a left side cross-sectional structural schematic diagram of the rotating device of the present invention; Figure 8 It is a schematic diagram of the split structure of the rotating device of the present invention; Fig. 9 is a schematic cross-sectional structure diagram of a rotary signal connector of the present invention; Fig.10 It is a schematic diagram of the structure of the measuring device of the present invention.

[0018] Reference numerals: 1. Water tunnel device; 2. Rotating device; 3. Phase-locking device; 4. Contraction section; 5. Test section; 6. Expansion section; 7. Assembly slot; 8. Inspection window; 9. Circular rotating slide; 10. Rotating slide; 11. Counterweight; 12. Propeller; 13. Measuring device; 14. Circular support slide; 15. Circular measuring slide; 16. Camera translation track; 17. Measuring slide; 18. Support slide; 19. Support rod; 20. Support ring; 21. Wire groove inside the cylinder; 22. Wire groove outside the cylinder; 23. Wire hole; 24. First-stage cylinder; 25. Second-stage cylinder; 26. Third-stage cylinder; 27. Catheter circular hole; 28 , wire tube; 29, external transmission shaft; 30, gear; 31, forked laser reflection guide; 32, forked square hole; 33, catheter fixed end; 34, forked interface; 35, inner transmission shaft; 36, rotating signal connector; 37, male connector; 38, female connector; 39, rotating laser guide; 40, line interface; 41, signal transmission slip ring; 42, PIV camera assembly; 43, camera connecting frame; 44, camera rotating frame; 45, PIV camera; 46, camera trapezoidal slider; 47, camera trapezoidal slide groove; 48, camera base; 49, camera buckle; 50, square wire port; 51, camera slide. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] like Figure 1-5As shown, a rotary PIV full-flow field synchronous tracking measurement device includes a water tunnel device 1, a rotating device 2, a measuring device 13 and a phase-locking device 3. The water tunnel device 1 is provided with a contraction section 4, a test section 5 and an expansion section 6 from front to back, and an assembly groove 7 is provided at the rear end of the expansion section 6. In actual application, the contraction section 4 and the test section 5 provided on the water tunnel device 1 are made of high-strength organic glass, and an image correction algorithm is used to ensure safety while ensuring that the image collected by the PIV camera 45 will not be distorted due to refraction of the pipe wall. A vertical inspection window 8 can also be provided behind the expansion section 6 for easy inspection and observation.

[0021] like Figure 3 As shown, the rotating device 2 is mounted in the test section 5 and the expansion section 6 of the water tunnel device 1, and includes an outer transmission shaft 29. The outer transmission shaft 29 is a hollow structure. A rotating signal connector 36 is arranged inside the outer transmission shaft 29. A rotating laser guide 39 is arranged in the rotating signal connector 36. A gear 30 is arranged at the end of the outer transmission shaft 29, and the gear 30 is connected to an external drive motor; a forked interface 34 is arranged at the front end of the outer transmission shaft 29, and a circular rotating slide perpendicular to the forked interface 34 is arranged at the forked interface 34. The circular rotating slide 9 is fixedly mounted on the assembly groove 7 of the water tunnel device 1, and a rotating slide 10 is movably connected to the inner side of the circular rotating slide 9, and a wire tube 28 is connected to the inner side of the rotating slide 10, and a wire is arranged in the wire tube 28, and the other end of the wire tube 28 is connected to the fork interface 34, and the wire in the wire tube 28 is electrically connected to the rotating laser guide 39 in the rotating signal connector 36; an inner transmission shaft 35 is connected to the front end of the fork interface 34, and a propeller 12 is arranged at the front end of the inner transmission shaft 35.

[0022] The wire tube 28 is connected to the rotating slide 10 via the front end of the tube fixing end 33, and it can be fixed in a sliding groove.

[0023] like Figure 6-9 As shown, the rotating signal connector 36 includes a male connector 37 and a female connector 38 that cooperate with each other, and the diameter of the front end of the male connector 37 gradually decreases; the interior of the female connector 38 is hollow to form a cavity with a gradually decreasing diameter, and a signal transmission slip ring 41 is arranged on the connecting inclined surface of the male connector 37 and the female connector 38. When the male connector 37 and the female connector 38 are tightly connected, the signal is transmitted through the signal transmission slip ring 41, and a rotating laser guide 39 is arranged in the male connector 37 and the female connector 38, and a forked laser reflection guide 31 is arranged at the forked interface 34, and the rotating laser guide 39 is electrically connected to the wire in the wire tube 28 at the forked interface 34 through the forked laser reflection guide 31.

[0024] The total length of the male connector 37 and the female connector 38 of the rotating signal connector 36 when they are fully closed and the length of the rotating laser guide 39 should be slightly larger than the length of the external transmission shaft 29, that is, when the rotating signal connector 36, the rotating laser guide 39 and the external transmission shaft 29 are flush with the end faces on the side without the gear 30, the end faces of the rotating signal connector 36 and the rotating laser guide 39 on the side of the gear 30 should extend beyond the gear 30, so that the external circuit of the transmission process maintains a certain safety distance from the transmission device.

[0025] like Figure 3 As shown, a circular support slide 14 is mounted in the middle of the inner transmission shaft 35, and the circular support slide 14 is connected to the inner wall of the expansion section 6 of the water tunnel device 1. A support slide 18 is movably connected to the inner side of the circular support slide 14, and the support slide 18 rotates in the circular support slide 14; a plurality of support rods 19 are connected to the inner side of the support slide 18, and the support rods 19 are gathered at the inner support ring 20, and the support ring 20 is fixedly connected to the inner transmission shaft 35. By setting the circular support slide 14, the abnormal lateral swing of the outer transmission shaft 29 and the inner transmission shaft 35 during high-speed rotation can be reduced. In actual application, the circular support slide 14 should be made of a lightweight material with greater rigidity to ensure that the outer transmission shaft 29 does not swing greatly during rotation.

[0026] By setting up the rotating device 2, i.e., assembling the outer transmission shaft 29, the rotating signal connector 36, the rotating laser guide 39, and the inner transmission shaft 35, the problem of stable power supply and signal data transmission of the camera under high-speed rotation is solved, and the continuity and stability of laser irradiation can also be ensured.

[0027] like Figure 3 As shown, the measuring device 13 is installed in the test section 5 of the water tunnel device 1. The measuring device 13 includes a camera translation track 16 and a circular measuring slide 15 vertically arranged on the camera translation track 16. A measuring slide 17 is movably connected to the inner side of the circular measuring slide 15, and a PIV camera assembly 42 is arranged on the measuring slide 17.

[0028] like Fig.10 As shown, the PIV camera assembly 42 includes a camera connecting frame 43, a camera rotating frame 44, a camera base 48, a PIV camera 45 and a counterweight 11. The camera connecting frame 43 is fixed to the inner side of the measuring slide 17 through a camera slide 51. The camera rotating frame 44 is hinged to the camera connecting frame 43. The camera base 48 is connected to the camera rotating frame 44. The PIV camera 45 is fixed on the camera base 48. Counterweights 11 are arranged at intervals on the inner side of the rotating slide 10 and at evenly distributed positions of the PIV cameras 45.

[0029] The camera base 48 is provided with a camera trapezoidal slider 46, and the camera rotating frame 44 is provided with a matching camera trapezoidal slide groove 47. The camera base 48 and the camera rotating frame 44 are connected through the camera trapezoidal slider 46 and the camera trapezoidal slide groove 47, and are fixed by a camera buckle 49 provided on the camera rotating frame 44; a square wire opening 50 is opened on the side of the camera connecting frame 43.

[0030] The setting of the measuring device 13, that is, the cooperation of the camera connecting frame 43, the camera rotating frame 44, the camera base 48, the PIV camera 45 and the counterweight 11, and the replaceable and adjustable measuring slide 17, ensures the stability of the PIV camera 45 during high-speed rotation and the safety of the equipment, and can adjust the deflection angle of the PIV camera 45 relative to the axial direction of the water tunnel device 1, and can also make the installation position of the PIV camera 45 on the circular measuring slide 15 flexible and changeable. Through the setting of the camera translation track 16, the horizontal position of the camera can be adjusted before or during shooting, so as to capture a more complete flow field.

[0031] The PIV camera 45 is fixed to the camera base 48 by screw connection, and the camera base 48 and the camera rotating frame 44 cooperate to form a sliding constraint through the camera trapezoidal slider 46 and the camera trapezoidal slide groove 47. After the camera base 48 completely enters the camera rotating frame 44, the camera buckle 49 locks the camera base 48 to completely fix the PIV camera 45. The camera connecting frame 43 and the camera rotating frame 44 are hinged to form a rotation constraint, which can realize the relative rotation of the PIV camera 45 within a certain range relative to the axial direction of the water tunnel device 1.

[0032] like Figure 1 and Figure 5 As shown, the phase-locking device 3 is a cylindrical structure, which is mounted on the outside of the test section 5 and the expansion section 6 of the water tunnel device 1. The inner walls at both ends of the phase-locking device 3 are respectively connected to the wire tube 28 of the rotating device 2 and the PIV camera assembly 42 of the measuring device 13. The external drive motor drives the external transmission shaft 29 and the forked interface 34 to rotate, and the wire tube 28 rotates on the circular rotating slide 9, thereby driving the phase-locking device 3 to rotate, and the phase-locking device 3 drives the PIV camera assembly 42 to rotate on the circular measuring slide 15.

[0033] like Figure 5As shown, the phase-locking device 3 is a telescopic structure, including a primary cylinder 24, a secondary cylinder 25 and a tertiary cylinder 26, wherein the adjacent cylinders are slidably connected, and a cylinder internal wire groove 21 and a cylinder external wire groove 22 are respectively provided on the inner wall and outer wall of the primary cylinder 24, the secondary cylinder 25 and the tertiary cylinder, and the wire at the wire tube 28 is fixed in the cylinder internal wire groove 21 through the wire hole 23 from the cylinder external wire groove 22, and connected to the PIV camera 45 from the square wire port 50 on the measuring device 13. The primary cylinder 24 of the phase-locking device 3 is connected to the wire tube 28, and the tertiary cylinder 26 of the phase-locking device 3 is connected to the PIV camera assembly 45.

[0034] The connection between the phase-locking device 3 and the wire tube 28 keeps the rotation of the PIV camera 45 and the propeller 12 synchronized at all times, ensuring the stability of the camera shooting; at the same time, it prevents the line from being affected by centrifugal force during rotation, causing instability in data transmission or power supply; and completely isolates the line from water to avoid water-electricity contact.

[0035] In actual application, the phase-locking device 3 is made of a lightweight material with relatively high rigidity to ensure the synchronization of the rotation of the PIV camera 45 and the propeller 12 and to prevent a large displacement of the line during the rotation process.

[0036] The rotating laser guide 39 , the male connector 37 , the female connector 38 , and the outer transmission shaft 29 are concentrically nested and connected, and the end faces of the rotating laser guide 39 , the male connector 37 , the female connector 38 , and the outer transmission shaft 29 are aligned on the side away from the gear 30 .

[0037] The rotating device 2, the measuring device 13 and the phase-locking device 3 are driven by an external driving motor to rotate coaxially and synchronously.

[0038] In the present invention, in order to achieve lightweight design, the components in the rotating device 2 and the measuring device 13 are all made of lightweight and high-strength materials. In order to achieve good sealing, the circular rotating track and its connection with the assembly groove 7 of the water tunnel device 1, and the position where the outer transmission shaft 29 and the water tunnel device 1 are connected, all use the dynamic sealing technology of the submarine propeller 12 drive shaft.

[0039] In the present invention, regarding synchronous rotation: during the rotation shooting process, the external transmission shaft 29 starts to rotate with the external power brought by the gear 30, driving the propeller 12 to start rotating, and the phase-locking device 3 is connected to the external transmission shaft 29 through the wire tube 28, and transmits the rotational power to the measuring slide 17 in the measuring device 13, so that the measuring slide 17 follows the rotation, and then drives the PIV camera 45 fixed on the measuring slide 17 to rotate.

[0040] like Figure 6-7As shown, the laser transmission device includes a rotating laser guide 39 connected to the male connector 37 and a forked laser reflection guide 31 arranged in the forked interface 34, wherein the forked laser reflection guide 31 extends from the forked square hole 32 on the forked interface 34, and extends to the position of the conduit circular hole 27 of the wire tube 28, and is electrically connected to the wire in the wire tube 28, then the wire in the wire tube 28, the forked laser reflection guide 31 in the forked interface 34, and the rotating laser guide 39 are electrically connected in sequence to realize signal transmission.

[0041] In the present invention, regarding the layout of the lines: the wire tube 28 is a hollow, high-rigidity, lightweight square tube, and the power line, signal line and other lines extending from the tail of the PIV camera 45 enter the three closely arranged inner wire grooves 21 of the cylinder on the phase-locking device 3 through the square wire openings 50 on the camera connecting frame 43. The lines on both sides enter the middle inner wire groove 21 of the cylinder, and then pass through the wire holes 23 on the side walls of the phase-locking device 3 to enter the outer wire groove 22 of the cylinder, and then enter the wire tube 28 through the outer wire groove 22 of the cylinder, and then enter the inside of the forked interface 34 through the square hole on the forked interface 34, and then connect to the line interface 40 on the end face of the rotating signal connector 36.

[0042] In this embodiment, the circular rotating slide 9 and the rotating slide 10, the circular measuring slide 15 and the measuring slide 17, and the circular supporting slide 14 and the supporting slide 18 are all connected by linear guide rails. Obviously, other connection methods that enable the two to move in a linear manner can also be adopted.

[0043] Embodiment 2: The water tunnel device 1 described in the present invention can be replaced by a wind tunnel device, which can be applied to synchronously measure the rotation process in the wind tunnel experiment.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A synchronous tracking and measuring device for a rotary PIV impeller fluid machinery flow field, comprising a water tunnel device (1), characterized in that: It also includes a rotating device (2), a measuring device (13) and a phase-locking device (3), The water tunnel device (1) is provided with a contraction section (4), a test section (5) and an expansion section (6) in sequence, and an assembly groove (7) is provided at the rear end of the expansion section (6); The rotating device (2) is mounted in the test section (5) and the expansion section (6) of the water tunnel device (1), and comprises an external transmission shaft (29). The external transmission shaft (29) is a hollow structure. A rotating signal connector (36) is arranged inside the external transmission shaft (29). A rotating laser guide (39) is arranged in the rotating signal connector (36). A gear (30) is arranged at the end of the external transmission shaft (29). The gear (30) is connected to an external drive motor. A forked interface (34) is arranged at the front end of the external transmission shaft (29). A circular rotating slideway (9) perpendicular to the forked interface (34) is arranged at the forked interface (34). ), the circular rotating slideway (9) is fixedly mounted on the assembly groove (7) of the water tunnel device (1), a rotating slide plate (10) is movably connected to the inner side of the circular rotating slideway (9), a wire tube (28) is connected to the inner side of the rotating slide plate (10), the other end of the wire tube (28) is connected to the bifurcated interface (34), a wire is arranged in the wire tube (28), and the wire in the wire tube (28) is electrically connected to the rotating laser guide (39) in the rotating signal connector (36); an inner transmission shaft (35) is connected to the front end of the bifurcated interface (34), and a propeller (12) is arranged at the front end of the inner transmission shaft (35); The measuring device (13) is mounted in the test section (5) of the water tunnel device (1), and comprises a camera translation track (16) and a circular measuring slideway (15) vertically arranged on the camera translation track (16), a measuring slide (17) is movably connected to the inner side of the circular measuring slideway (15), and a PIV camera assembly (42) is arranged on the measuring slideway (17); The phase-locking device (3) is a cylindrical structure, which is mounted on the outside of the test section (5) and the expansion section (6) of the water tunnel device (1). The inner walls at both ends of the phase-locking device (3) are respectively connected to the wire tube (28) of the rotating device (2) and the PIV camera assembly (42) of the measuring device (13). The external drive motor drives the external transmission shaft (29) and the bifurcated interface (34) to rotate, and the wire tube (28) rotates on the circular rotating slide (9), thereby driving the phase-locking device (3) to rotate, and the phase-locking device (3) drives the PIV camera assembly (42) to rotate on the circular measuring slide (15).

2. A synchronous tracking and measuring device for a rotary PIV impeller fluid machinery flow field according to claim 1, characterized in that: The rotary signal connector (36) comprises a male connector (37) and a female connector (38) that cooperate with each other. The diameter of the front end of the male connector (37) gradually decreases. The interior of the female connector (38) is hollow, forming a cavity with a gradually decreasing diameter. A signal transmission slip ring (41) is provided on the inclined surface where the male connector (37) and the female connector (38) are connected. When the male connector (37) and the female connector (38) are tightly connected, the signal is transmitted through the signal transmission slip ring (41). A rotary laser guide (39) is provided in the male connector (37) and the female connector (38). A bifurcated laser reflection guide (31) is provided at the bifurcated interface (34). The rotary laser guide (39) is electrically connected to the wire in the wire tube (28) at the bifurcated interface (34) through the bifurcated laser reflection guide (31).

3. A synchronous tracking and measuring device for a rotary PIV impeller fluid machinery flow field according to claim 2, characterized in that: A circular support slideway (14) is sleeved on the outer side of the middle part of the inner transmission shaft (35), the circular support slideway (14) is connected to the inner wall of the expansion section (6) of the water tunnel device (1), the inner side of the circular support slideway (14) is movably connected to a support slide plate (18), the support slide plate (18) rotates in the circular support slideway (14); the inner side of the support slide plate (18) is connected to a plurality of support rods (19), the support rods (19) are gathered at an internal support ring (20), and the support ring (20) is fixedly connected to the inner transmission shaft (35).

4. A synchronous tracking and measuring device for a rotary PIV impeller fluid machinery flow field according to claim 1, characterized in that: The PIV camera assembly (42) comprises a camera connecting frame (43), a camera rotating frame (44), a camera base (48), a PIV camera (45) and a counterweight (11); the camera connecting frame (43) is fixed to the inner side of a measuring slide (17) via a camera slide (51); the camera rotating frame (44) is hinged to the camera connecting frame (43); the camera base (48) is connected to the camera rotating frame (44); and the PIV camera (45) is fixed to the camera base (48); and counterweights (11) are arranged at intervals on the inner side of the rotating slide (10) and at positions evenly distributed between the PIV cameras (45).

5. A synchronous tracking and measuring device for a rotary PIV impeller fluid machinery flow field according to claim 4, characterized in that: The camera base (48) is provided with a camera trapezoidal slider (46), and the camera rotating frame (44) is provided with a matching camera trapezoidal slide groove (47). The camera base (48) and the camera rotating frame (44) are connected via the camera trapezoidal slider (46) and the camera trapezoidal slide groove (47), and are fixed via a camera buckle (49) provided on the camera rotating frame (44); a square wire opening (50) is provided on the side of the camera connecting frame (43).

6. The synchronous tracking and measuring device for the flow field of a rotary PIV impeller fluid machinery according to claim 1, characterized in that: The phase-locking device (3) is a telescopic structure, comprising a primary cylinder (24), a secondary cylinder (25) and a tertiary cylinder (26), wherein adjacent cylinders are slidably connected, and cylinder inner wire grooves (21) and cylinder outer wire grooves (22) are respectively provided on the inner walls and outer walls of the primary cylinder (24), the secondary cylinder (25) and the tertiary cylinder (26), wherein the wire at the wire tube (28) is fixed in the cylinder inner wire groove (21) through the wire hole from the cylinder outer wire groove (22), and is connected to the PIV camera (45) from the square wire port (50) on the measuring device (13).

7. The synchronous tracking and measuring device for the flow field of a rotary PIV impeller fluid machinery according to claim 1, characterized in that: The rotating laser guide (39), the male connector (37), the female connector (38), and the external transmission shaft (29) are concentrically nested and connected, and the end faces of the rotating laser guide (39), the male connector (37), the female connector (38), and the external transmission shaft (29) are aligned on the side away from the gear (30).

8. The synchronous tracking and measuring device for the flow field of a rotary PIV impeller fluid machinery according to claim 1, characterized in that: The rotating device (2), the measuring device (13) and the phase-locking device (3) rotate coaxially and synchronously under the drive of an external driving motor.

9. The synchronous tracking and measuring device for the flow field of a rotary PIV impeller fluid machinery according to claim 6, characterized in that: The primary cylinder (24) of the phase-locking device (3) is connected to the wire tube (28), and the tertiary cylinder (26) of the phase-locking device (3) is connected to the PIV camera assembly (42).

Images