Measurement system and method for simulating high Reynolds number flow field by underwater vehicle

Abstract

The invention discloses a measurement system and method for an underwater vehicle to simulate a high Reynolds number flow field, and the system comprises a test pool, a PIV system and an underwater vehicle model, the PIV system and the underwater vehicle model are disposed in the test pool, the underwater vehicle model is sleeved with a torrent wire, and the torrent wire is used to change the boundary layer structure of the underwater vehicle model; and flow field characteristics of different Reynolds numbers are simulated by adjusting the height of the torrent wire exceeding the outside of the underwater vehicle model. And flow field information in the test is acquired by using a PIV system, so that flow field data visualization is realized. By adjusting the installation size and the installation position of the torrent wire, the underwater vehicle flow field under different high Reynolds numbers can be simulated, and the requirements of a surrounding flow field test and a wake flow field test can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater vehicle testing, and relates to a measurement system and method for underwater vehicle simulating a high Reynolds number flow field. Background Art

[0002] Underwater vehicles are widely used in life, mineral development and military. Whether in the civil field or the military field, underwater vehicles play an extremely important role. With the increasing development of the ocean, the development and improvement of underwater vehicles is particularly important.

[0003] Before an underwater vehicle is put into use, the model will be tested and verified. Due to the limitations of the test equipment, it is currently difficult to simulate the flow field of an underwater vehicle under high Reynolds numbers. Therefore, the test verification of underwater vehicles under high Reynolds numbers is still challenging. Summary of the invention

[0004] In order to address the deficiencies in the prior art, the present application proposes a measurement system and method for underwater vehicle simulation of high Reynolds number flow fields, aiming to solve the problem that underwater vehicle flow fields under high Reynolds numbers are difficult to simulate.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A measurement system for underwater vehicle simulating high Reynolds number flow field, comprising:

[0007] Test pool,

[0008] The PIV system installed in the test pool is used to collect flow field information during the test;

[0009] A model of an underwater vehicle placed in a test tank;

[0010] The torrent filaments are mounted on the outside of the underwater vehicle model, and the boundary layer structure of the underwater vehicle model is changed by using the torrent filaments; the flow field characteristics of different Reynolds numbers are simulated by adjusting the height of the torrent filaments beyond the outside of the underwater vehicle model.

[0011] Furthermore, when conducting a flow field test, the rapid current wire adopts a single-slot rapid current wire and is installed at the front end of the underwater vehicle model.

[0012] Furthermore, when conducting a wake field test, the rapid current wire adopts a multi-slot rapid current wire and is installed at the junction of the mid-body and the stern of the underwater vehicle model.

[0013] Furthermore, the rapids wire is detachably connected to the outer wall of the underwater vehicle model.

[0014] Furthermore, the height of the torrent wire beyond the exterior of the underwater vehicle model is selected between 1 mm and 5 mm.

[0015] Furthermore, the underwater vehicle model is suspended in the test pool by a sword seat.

[0016] Furthermore, the position and movement mode of the underwater vehicle model in the test pool are adjusted by a traction device.

[0017] Furthermore, the PIV system includes a laser transmitter head, a light guide arm, a laser emitter, a coordinate frame, a high-frame camera, a light sheet, a laser transmitter power supply, a synchronization controller, and a computer; the laser transmitter head is connected to the laser transmitter through the light guide arm, and the laser transmitter is connected to the laser power supply, the synchronization controller, and the computer in sequence; the high-frame camera is arranged toward the light sheet area generated by the laser head, and the high-frame camera is connected to the synchronization controller; the high-speed camera is connected to the coordinate frame.

[0018] Furthermore, the position of the PIV system in the test tank is moved according to test requirements.

[0019] A method for measuring a high Reynolds number flow field simulated by an underwater vehicle is disclosed. The method uses the above-mentioned measurement system for simulating a high Reynolds number flow field by an underwater vehicle to measure the flow field characteristics of the underwater vehicle at different Reynolds numbers.

[0020] Beneficial effects of the present invention:

[0021] 1. The PIV measurement system and method provided by the present invention can accurately and effectively measure and extract flow field data information. Through a high frame rate camera and a synchronous controller, image information can be accurately extracted to achieve stable frame synchronization measurement. It is simple to operate and has strong stability.

[0022] 2. The laser transmitter head adopts three-degree-of-freedom connection, which can generate omnidirectional light. The measurement system is movable as a whole, and can measure the flow field and wake field of underwater vehicles;

[0023] 3. The present invention changes the boundary layer structure through the influence of the rapid flow wire on the underwater vehicle, advances the process from laminar flow to turbulent flow, simulates the flow field characteristics of the underwater vehicle under high Reynolds number, adjusts the height of the rapid flow wire within 1mm-5mm to simulate the flow field characteristics of different Reynolds numbers, designs the rapid flow wire with slots, and reduces the influence of the interaction between the rapid flow wire and the hull and tail wing;

[0024] 4. The present invention designs the main body of the sword seat into a water drop shape, which can effectively reduce the influence of the sword on the flow field of the underwater vehicle and make the measured flow field data more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of a system for measuring the flow field of an underwater vehicle under a simulated high Reynolds number;

[0026] Figure 2is a schematic diagram of the structure of an underwater vehicle model;

[0027] Figure 3 It is a schematic diagram of the installation position of the underwater vehicle rapid current wire;

[0028] Figure 4 : are structural diagrams of torsion wires, wherein (a) is a structural diagram of annular torsion wires, (b) is a structural diagram of a single-notch torsion wire, and (c) is a structural diagram of a multi-notch torsion wire;

[0029] Figure 5 It is a schematic diagram of the sword seat structure;

[0030] Description of reference numerals:

[0031] 1. Underwater vehicle model, 1-1. Sword base installation docking port, 1-2. Underwater vehicle model command platform, 1-3 Underwater vehicle model tail wing; 2. Rapid current wire, 21. Annular rapid current wire, 22. Single-slot rapid current wire, 221. Front rapid current wire slot, 23. Multi-slot rapid current wire, 231. Rear rapid current wire slot; 3. Sword base, 31. Docking plate installed on the top of the sword base, 33. Sword body, 32. Docking plate installed on the bottom of the sword base; 4. Rectangular frame, 5. Laser transmitter head, 6. Light guide arm, 7. Laser transmitter, 8. Coordinate frame, 9. High-speed camera, 10. Sheet light, 11. Laser transmitter power supply, 12. Synchronous controller, 13. Computer. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Combined with Figure 1-5 The measurement system for simulating high Reynolds number flow field of an underwater vehicle shown in the figure comprises: a test pool, an underwater vehicle model 1 arranged in the test pool, and a PIV system. The underwater vehicle model 1 is provided with a torrent wire 2, which is used to simulate the flow field characteristics of high Reynolds number, so as to facilitate the test of the flow field and wake field of the underwater vehicle under high Reynolds number.

[0034] In this embodiment, the underwater vehicle model 1 is fixedly connected to the rectangular frame 4 through the sword seat 3, and the rectangular frame 4 is arranged on the upper part of the test pool. Figure 5 As shown, it includes a docking plate 31 installed on the top of the sword seat, a sword body 33, and a docking plate 32 installed on the bottom of the sword seat. The docking plate 31 installed on the top of the sword seat and the docking plate 32 installed on the bottom of the sword seat are located at both ends of the sword body 33; the flow-facing surface of the sword body 33 is designed to be a water drop-shaped structure, which helps the sword body 33 to generate smaller flow field disturbances, thereby reducing the influence of the sword seat 3 on the surrounding flow field and wake field around the underwater vehicle model 1, and improving the test accuracy.

[0035] The top of the underwater vehicle model 1 is provided with a pedestal mounting interface 1-1, which matches with the pedestal bottom mounting interface 32 and is connected by fasteners, such as bolts, screws, etc. The pedestal top mounting interface 31 is connected to the mounting groove at the bottom of the rectangular frame 4 by fasteners, thereby hanging the underwater vehicle model 1 in the test pool.

[0036] In this embodiment, the underwater vehicle model 1 is fixed under the rectangular frame 4 by two sword seats 3 to ensure the stability of the installation of the underwater vehicle model 1.

[0037] In this embodiment, the underwater vehicle model 1 is further provided with an underwater vehicle model command platform 1-2, and the underwater vehicle model command platform 1-2 is located at the bottom of the underwater vehicle model 1. The tail of the underwater vehicle model 1 is provided with an underwater vehicle model tail wing 1-3.

[0038] In this embodiment, an annular torrent filament 2 is mounted on the outside of the underwater vehicle model 1 to change the boundary layer structure and simulate the flow field characteristics of the underwater vehicle under high Reynolds number. The principle is that the torrent filament will change the boundary layer structure at the installation position, so that the process of laminar flow turning into turbulent flow is advanced, thereby having flow field characteristics similar to those of the underwater vehicle under high Reynolds number.

[0039] More specifically, the flow field characteristics of different Reynolds numbers can also be simulated by adjusting the height of the rapids wire 2 beyond the outside of the underwater vehicle model 1, and the height can be selected between 1 mm and 5 mm.

[0040] More specifically, in order to meet the requirements of different test simulations, the installation position of the torrent wire 2 on the underwater vehicle model 1 and the structural reference of the torrent wire 2 can be changed. Figure 4 In (a), (b), and (c), for example, in a flow field test, a single-slotted torrent filament 22 is installed at the front end of the underwater vehicle model 1 to reduce the influence of the interaction between the torrent filament and the hull. In a wake field test, a multi-slotted torrent filament 23 is installed at the junction of the body and the stern of the underwater vehicle model 1 to reduce the influence of the interaction between the torrent filament and the tail wing.

[0041] In this embodiment, the rapids wire 2 and the inner wall of the underwater vehicle model 1 are mutually attached and detachable, and the command platform 1-2 and the tail wing 1-3 of the underwater vehicle model 1 are both detachable, so as to facilitate the light body test.

[0042] In this embodiment, a traction device is provided on the rectangular frame 4, which can control the specific mode of movement of the underwater vehicle model. The position of the underwater vehicle model can be adjusted according to the length, width and height of the water tank, so that different underwater vehicle models can be tested at the optimal position.

[0043] In this embodiment, the PIV system is used to collect flow field information in the test and realize the visualization processing of flow field information. The PIV system specifically includes a laser transmitter head 5, a light guide arm 6, a laser transmitter 7, a coordinate frame 8, a high-frame camera 9, a light sheet 10, a laser transmitter power supply 11, a synchronous controller 12, and a computer 13; the laser transmitter head 5 is connected to the laser transmitter 7 through the light guide arm 6; the area that can be illuminated by the light source generated by the laser head 5 is the light sheet 10, and the area where the light sheet 10 is located is the data extraction area for measuring the flow field. The three-degree-of-freedom design adopted by the laser transmitter head 5 can generate an omnidirectional light sheet 10. The laser transmitter 7 is connected to the laser power supply 11 and is connected to the synchronous controller 12 to ensure that the output signal and frequency of the laser emission can be effectively transmitted; the laser transmitter 7 provides the output signal for the laser head 5 and transmits it through the light guide arm 6, and the laser power supply 11 provides a stable output for the laser transmitter 7. The flow field data of the laser head 5 in the area of ​​the sheet light 10 measuring the flow field is extracted and recorded by the high-speed camera 9; the high-speed camera 9 is connected to the coordinate frame 8, which can provide the point information of the data. At the same time, the coordinate frame 8 can be dragged in the test water tank to achieve the effective correspondence between the high-speed camera 9 and the sheet light 10. The high-speed camera 9 is connected to the synchronization controller 12 to synchronize the image information and the laser emission information for unified and centralized processing. By connecting the synchronization controller 12 and the computer 13, the flow field data is summarized here, which is convenient for the effective collection of subsequent data and result processing.

[0044] In this embodiment, the PIV system is movable as a whole, which is convenient for underwater vehicle flow field and wake field measurement tests. When extracting the wake flow field data of the underwater vehicle, particles are sprinkled in the predicted flow field area, and the coordinate frame 8 is adjusted to ensure that the laser transmitter 5 and the high-speed camera 9 are in the predicted flow field area. The laser transmitter 5 can emit a sheet of light in the predicted area to illuminate the particles, and the high-speed camera 9 can extract image information in the predicted area, and provide accurate position information with the help of the coordinate plate;

[0045] In this embodiment, the light sheet 10 area also needs to be supplemented with light to ensure that the image acquisition device can collect clear image information. The light sheet 10 area is supplemented with light by an LED light, and the light source is arranged on the image acquisition device, that is, the LED light is installed on the high-speed camera 9, providing a stable light source for the high-speed camera 9, thereby ensuring that the high-speed camera 9 can take an undistorted bubble flow picture in the flow field.

[0046] In this embodiment, the laser transmitter 7 adopts a Tolar-527 laser transmitter, and the high-speed camera 9 adopts a SUAGC model.

[0047] In this embodiment, the synchronous controller adopts the LC880 model, which has the advantages of rapidity and reliability.

[0048] The above embodiments are only used to illustrate the design ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The protection scope of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications made based on the principles and design ideas disclosed by the present invention are within the protection scope of the present invention.

Claims

1. A measurement system for underwater vehicles simulating high Reynolds number flow fields, characterized in that: include: Test pool, The PIV system installed in the test pool is used to collect flow field information during the test; An underwater vehicle model (1) placed in a test tank; A torrent filament (2) is mounted on the outside of an underwater vehicle model (1), and the boundary layer structure of the underwater vehicle model (1) is changed by using the torrent filament (2); and flow field characteristics of different Reynolds numbers are simulated by adjusting the height of the torrent filament (2) beyond the outside of the underwater vehicle model (1).

2. A measurement system for underwater vehicle simulating high Reynolds number flow field according to claim 1, characterized in that: When conducting a flow field test, the rapid flow wire (2) adopts a single-slot rapid flow wire (22) and is installed at the front end of the underwater vehicle model (1).

3. The measurement system for underwater vehicle simulating high Reynolds number flow field according to claim 1, characterized in that: When conducting a wake field test, the rapid current wire (2) adopts a multi-slot rapid current wire (23) and is installed at the junction of the mid-body and the stern of the underwater vehicle model (1).

4. The measurement system for underwater vehicle simulating high Reynolds number flow field according to claim 1, characterized in that: The torrent wire (2) is detachably connected to the outer wall surface of the underwater vehicle model (1).

5. The measurement system for underwater vehicle simulating high Reynolds number flow field according to claim 1, characterized in that: The height of the torrent wire (2) beyond the exterior of the underwater vehicle model (1) is selected between 1 mm and 5 mm.

6. The measurement system for underwater vehicle simulating high Reynolds number flow field according to claim 1, characterized in that: The underwater vehicle model (1) is suspended in a test pool via a sword seat (3).

7. The measurement system for underwater vehicle simulating high Reynolds number flow field according to claim 1, characterized in that: The position and movement mode of the underwater vehicle model (1) in the test pool are adjusted by a traction device.

8. The measurement system for underwater vehicle simulating high Reynolds number flow field according to claim 1, characterized in that: The PIV system comprises a laser emitting head (5), a light guide arm (6), a laser emitter (7), a coordinate frame (8), a high-frame camera (9), a light sheet (10), a laser emitter power supply (11), a synchronization controller (12), and a computer (13); the laser emitting head (5) is connected to the laser emitter (7) through the light guide arm (6), and the laser emitter (7) is connected to the laser power supply (11), the synchronization controller (12), and the computer (13) in sequence; the high-frame camera (9) is arranged toward the light sheet (10) area generated by the laser head (5), and the high-frame camera (9) is connected to the synchronization controller (12); and the high-speed camera (9) is connected to the coordinate frame (8).

9. The measurement system for underwater vehicle simulating high Reynolds number flow field according to claim 1, characterized in that: The position of the PIV system in the test tank is moved according to the test requirements.

10. A method for measuring a high Reynolds number flow field simulated by an underwater vehicle, characterized in that: The measurement system for simulating high Reynolds number flow field of an underwater vehicle as claimed in claim 1 is used to measure the flow field characteristics of the underwater vehicle at different Reynolds numbers.

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