A synchronous tracking and measuring device for the flow field of a rotating PIV impeller fluid machinery

Abstract

The present invention belongs to the field of water tunnel and wind tunnel testing, and specifically relates to a synchronous tracking and measuring device for the flow field of a rotating PIV impeller fluid machinery. A synchronous tracking and measuring device for the flow field of a rotating PIV impeller fluid machinery comprises a water tunnel device, a rotating device, a measuring device, and a phase-locking device. The rotating device is mounted inside the water tunnel device, a rotating signal connector is provided inside the external transmission shaft, a rotating laser guide is provided in the signal connector, and a gear is provided at the end of the external transmission shaft, which is connected to an external drive motor; the measuring device is mounted inside the test section position and comprises a PIV camera assembly; the phase-locking device is a cylindrical structure, which is mounted outside the water tunnel device, the inner wall of the outer end of the phase-locking device is connected to the wire tube of the rotating device, and the inner wall of the inner end of the phase-locking device is connected to the PIV camera assembly of the measuring device. This device can realize synchronous tracking measurement of the flow field of a rotating impeller fluid machinery, thereby improving the integrity and continuity of the test.

Description

Technical Field

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

[0002] High-speed water and wind tunnels provide an ideal platform for studying fluid behavior under diverse conditions. By simulating high-speed flow, researchers can observe fluid flow characteristics, turbulence, and interactions between fluids and solids. PIV (Particle Image Velocimetry) is a non-contact method for measuring fluid velocity fields. It disperses tiny tracer particles in the fluid, illuminates them with a laser, and then uses a high-speed camera to capture images of the scattered light as the particles move through the fluid. The particle displacement is then analyzed to calculate the fluid's velocity field.

[0003] PIV technology is widely used in fluid mechanics research, aerospace, energy engineering, naval architecture, power machinery engineering, and other fields for studying complex rotational flow phenomena, optimizing designs, and verifying numerical simulation results. When used in fluid mechanics experiments for aircraft and underwater vehicles, the flow field changes near the surface of rotating objects, such as propellers, fighter jets, and stall spins, are observed. However, the use of existing PIV flow field measurement and display systems, due to the fixed camera in the test setup, has limitations in flow field measurement. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and 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 rotary 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, and 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 the external drive motor; a fork interface is arranged at the front end of the outer transmission shaft, and a circular rotating slide perpendicular to the fork interface is arranged at the fork 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 fork 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 fork interface, and a propeller is arranged at the front end of the inner transmission shaft.

[0007] Preferably, the rotary signal connector includes a male connector and a female connector that cooperate with each other, and the diameter of the front end of the male connector gradually decreases; the interior of the female connector is hollow, forming a cavity with a gradually decreasing diameter, and a signal transmission slip ring is provided on the inclined surface where the male connector and the female connector are connected. When the male connector and the female connector are tightly connected, the signal is transmitted through the signal transmission slip ring, and a rotating laser guide is provided in the male connector and the female connector, and a forked laser reflection guide is provided at the forked interface. 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 portion 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 provided 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 converge at the inner support ring, and the support ring is fixedly connected to the inner transmission shaft. The provision of the circular support slide can reduce abnormal lateral swing of the outer transmission shaft and the inner transmission shaft during high-speed rotation.

[0009] The measuring device is installed 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.

[0010] 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.

[0011] Preferably, a camera trapezoidal slider is provided on the camera base, and a matching camera trapezoidal slide 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, 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.

[0012] 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 of the two ends of the phase-locking device are respectively connected to the wire pipe 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 pipe rotates on the circular rotating slide, thereby driving the phase-locking device to rotate, and the phase-locking device drives the PIV camera assembly to rotate on the circular measuring slide.

[0013] Preferably, the phase-locking device is a telescopic structure, including a primary cylinder, a secondary cylinder and a tertiary cylinder, and the adjacent cylinders are slidably connected. The inner wall and outer wall of the primary cylinder, the secondary cylinder and the tertiary cylinder are respectively provided with an inner cylinder wire groove and an outer cylinder wire groove. The wires at the wire tube are fixed in the inner cylinder wire groove through the wire hole at the outer cylinder wire groove, and are connected to the PIV camera from the square wire port on the measuring device.

[0014] More preferably, the first-stage cylinder of the phase-locking device is connected to the wire tube, and the third-stage cylinder of the phase-locking device is connected to the PIV camera assembly.

[0015] Preferably, the rotating laser guide, male connector, female connector and outer transmission shaft are concentrically nested and connected, and their end faces are aligned on the side away from the gear.

[0016] Preferably, the rotating device, the measuring device and the phase-locking device rotate coaxially and synchronously when driven by an external driving motor.

[0017] 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, thereby realizing 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

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 Schematic diagram of the water tunnel device structure of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the rotating device and the measuring device of the present invention;

[0021] Figure 4 This is a partial perspective structural diagram of the water tunnel device wall of the present invention;

[0022] Figure 5 This is a schematic diagram of the phase-locked barrel structure of the present invention;

[0023] Figure 6 It is a schematic diagram of the overall structure of the rotating device of the present invention;

[0024] Figure 7 It is a schematic diagram of the left side cross-sectional structure of the rotating device of the present invention;

[0025] Figure 8 It is a schematic diagram of the disassembled structure of the rotating device of the present invention;

[0026] Figure 9 Schematic diagram of the cross-sectional structure of the rotary signal connector of the present invention;

[0027] Figure 10 Schematic diagram of the structure of the measuring device of the present invention.

[0028] Reference numerals:

[0029] 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 cylinder; 22. Wire groove outside cylinder; 23. Wire hole; 24. First-stage cylinder; 25. Second-stage cylinder; 26. Third-stage cylinder; 27. Circular hole of conduit; 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; 48, camera base; 49, camera buckle; 50, square wire port; 51, camera slide. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] like Figure 1-5 As 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, with an assembly slot 7 provided at the rear end of the expansion section 6. In actual application, the contraction section 4 and 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 is not distorted by refraction from the pipe wall. A vertical inspection window 8 can also be provided behind the expansion section 6 to facilitate inspection and observation.

[0032] like Figure 3As 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 rotation signal connector 36 is provided inside the outer transmission shaft 29. A rotation laser guide 39 is provided in the rotation signal connector 36. A gear 30 is provided at the end of the outer transmission shaft 29, and the gear 30 is connected to the external drive motor; a bifurcation interface 34 is provided at the front end of the outer transmission shaft 29, and a circular rotating slide perpendicular to the bifurcation interface 34 is provided at the bifurcation 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. The inner side of the rotating slide 10 is connected to a wire tube 28, and a wire is arranged in the wire tube 28. The other end of the wire tube 28 is connected to the bifurcation 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 bifurcation interface 34, and a propeller 12 is arranged at the front end of the inner transmission shaft 35.

[0033] The wire tube 28 is connected to the rotating slide 10 through the front end of the tube fixing end 33, and can be fixed in a sliding groove.

[0034] like Figure 6-9 As shown, the rotary signal connector 36 includes 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 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. A rotary laser guide 39 is provided in the male connector 37 and the female connector 38, and a forked laser reflection guide 31 is provided at the forked interface 34. The rotary 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.

[0035] 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 end faces of the rotating signal connector 36, the rotating laser guide 39 and the external transmission shaft 29 on the side without the gear 30 are flush, 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.

[0036] like Figure 3As shown, a circular support slide 14 is mounted in the middle of the inner transmission shaft 35. 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. The support rods 19 converge at the internal support ring 20, and the support ring 20 is fixedly connected to the inner transmission shaft 35. The provision of the circular support slide 14 can reduce abnormal lateral swinging of the outer transmission shaft 29 and the inner transmission shaft 35 during high-speed rotation. 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 significantly during rotation.

[0037] 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 problems of stable power supply and signal data transmission of the camera in the high-speed rotating state are solved, and the continuity and stability of the laser irradiation can also be ensured.

[0038] 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.

[0039] like Figure 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 at the evenly distributed positions on the inner side of the rotating slide 10 and the PIV camera 45.

[0040] 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 47. The camera base 48 and the camera rotating frame 44 are connected by the camera trapezoidal slider 46 and the camera trapezoidal slide 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.

[0041] The arrangement of the measuring device 13, namely the camera connecting frame 43, camera rotating frame 44, camera base 48, PIV camera 45, counterweight 11, and replaceable and adjustable measuring slide 17, ensures the stability of the PIV camera 45 during high-speed rotation and the safety of the equipment. It can also adjust the deflection angle of the PIV camera 45 relative to the axial direction of the water tunnel device 1 and make the installation position of the PIV camera 45 on the circular measuring slide 15 flexible and changeable. The provision of the camera translation track 16 allows the horizontal position of the camera to be adjusted before or during shooting, allowing for a more complete capture of the flow field.

[0042] The PIV camera 45 is secured to the camera base 48 via screws. The camera base 48 and the camera rotating frame 44 are slidably restrained by a trapezoidal slider 46 and a trapezoidal slot 47. Once the camera base 48 is fully inserted into the camera rotating frame 44, the camera latch 49 locks the camera base 48, securing the PIV camera 45. The camera connecting frame 43 and the camera rotating frame 44 are hinged to form a rotational restraint, enabling the PIV camera 45 to rotate within a certain range relative to the axial direction of the water tunnel apparatus 1.

[0043] 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.

[0044] like Figure 5 As shown, the phase-locking device 3 is a telescopic structure, including a primary cylinder 24, a secondary cylinder 25, and a tertiary cylinder 26. The adjacent cylinders are slidably connected. Internal and external wire grooves 21 and 22 are provided on the inner and outer walls of the primary cylinder 24, the secondary cylinder 25, and the tertiary cylinder, respectively. The wires at the wire conduit 28 pass from the external wire groove 22 through the wire hole 23 and are fixed in the internal wire groove 21. They are then connected to the PIV camera 45 through 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 conduit 28, and the tertiary cylinder 26 of the phase-locking device 3 is connected to the PIV camera assembly 45.

[0045] The connection between the phase-locking device 3 and the conduit 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, which may cause instability in data transmission or power supply; and completely isolates the line from water to avoid water-electricity contact.

[0046] In actual application, the phase-locking device 3 is made of a lightweight material with high rigidity to ensure the synchronization of the rotation of the PIV camera 45 and the propeller 12 and to prevent large displacement of the circuit during the rotation process.

[0047] 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 their end faces are aligned on the side away from the gear 30 .

[0048] 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.

[0049] In the present invention, to achieve a lightweight design, components in the rotating device 2 and the measuring device 13 are all made of lightweight, high-strength materials. To achieve a good seal, the circular rotating track and its connection with the assembly groove 7 of the water tunnel device 1, as well as the connection between the outer drive shaft 29 and the water tunnel device 1, all use dynamic sealing technology similar to that used for the drive shaft of a submarine propeller 12.

[0050] 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-locked device 3 is connected to the external transmission shaft 29 through the wire tube 28, transmitting 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.

[0051] like Figure 6-7 As 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.

[0052] 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 cylindrical wire grooves 21 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 cylindrical wire groove 21, and then pass through the wire holes 23 on the side wall of the phase-locking device 3 to enter the cylindrical external wire groove 22, and then enter the wire tube 28 through the cylindrical external wire groove 22, and then enter the bifurcation interface 34 through the square hole on the bifurcation interface 34, and then connect to the line interface 40 on the end face of the rotary signal connector 36.

[0053] 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 can enable the two to move in a linear direction can also be adopted.

[0054] 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 a wind tunnel experiment.

[0055] 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 the flow field of a rotary PIV impeller fluid machinery, 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 includes an outer transmission shaft (29). The outer transmission shaft (29) is a hollow structure. A rotation signal connector (36) is provided inside the outer transmission shaft (29). A rotation laser guide (39) is provided in the rotation signal connector (36). A gear (30) is provided at the end of the outer transmission shaft (29). The gear (30) is connected to an external drive motor. A bifurcated interface (34) is provided at the front end of the outer transmission shaft (29). A circular rotating slideway (9) perpendicular to the bifurcated interface (34) is provided at the bifurcated interface (34). ), the circular rotating slideway (9) is fixedly mounted on the assembly groove (7) of the water tunnel device (1), a rotating slide (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 (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). 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). A PIV camera assembly (42) is arranged on the measuring slide (17). The phase-locking device (3) is a cylindrical structure, which is mounted outside the test section (5) and the expansion section (6) of the water tunnel device (1). The inner walls of the two 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. 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 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), and 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. The synchronous tracking and measuring device for the flow field of a rotary PIV impeller fluid machinery according to claim 2, characterized in that: A circular support slideway (14) is sleeved on the outer side of the middle portion of the inner transmission shaft (35), and the circular support slideway (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 slideway (14), and the support slide (18) rotates in the circular support slideway (14); a plurality of support rods (19) are connected to the inner side of the support slide (18), and the support rods (19) converge at an internal support ring (20), and the support ring (20) is fixedly connected to the inner transmission shaft (35).

4. 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 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 the 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 uniformly distributed between the PIV camera (45).

5. The synchronous tracking and measuring device for the flow field of a rotary PIV impeller fluid machinery 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 (47). The camera base (48) and the camera rotating frame (44) are connected through the camera trapezoidal slider (46) and the camera trapezoidal slide (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).

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 a cylinder inner wire groove (21) and a cylinder outer 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 (26), wherein the wire at the wire tube (28) passes through the wire hole at the cylinder outer wire groove (22) and is fixed in the cylinder inner wire groove (21), 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 first-stage cylinder (24) of the phase-locking device (3) is connected to the wire tube (28), and the third-stage cylinder (26) of the phase-locking device (3) is connected to the PIV camera assembly (42).

Images