Device, working method and system for testing flow field around polymer injected underwater body

Abstract

The invention relates to the technical field of ship and ocean engineering, in particular to a device, a working method and a system for testing a flow field around a polymer injected underwater body. The testing device comprises a towing tank, a driving device is arranged above the towing tank, and the driving device is connected with an underwater body model and drives the underwater body model to move in the towing tank; the polymer injection system is connected with the submerging body model; and the flow field test system comprises a flow velocity measurement device, a particle image velocity measurement system and a pressure detection piece, the pressure detection piece is arranged on the underwater body model, and the pressure detection piece is connected with the flow velocity measurement device and the particle image velocity measurement system. A polymer solution can be accurately controlled to be injected into a boundary layer of the underwater body model, and the change of a flow field is monitored and analyzed in real time by using a multi-parameter testing system; the method has the advantages of high test precision, simplicity and convenience in operation, high real-time performance and the like, and provides powerful technical support for research and application of a submarine body drag reduction technology.

Description

Technical Field

[0001] The invention relates to the technical field of ship and ocean engineering, and in particular to a flow field testing device, a working method and a system around a submersible body injected with polymer. Background Art

[0002] With the continuous development of underwater navigation technology, the resistance problem faced by submersible bodies during underwater navigation has become increasingly prominent. When a submersible body moves underwater, friction will be generated between its surface and the surrounding water. This friction will consume a lot of energy and limit the speed and range of the submersible body. Therefore, reducing the resistance on the surface of the submersible body has become one of the important research directions for improving the performance of the submersible body.

[0003] In recent years, polymer drag reduction technology has shown great potential in reducing drag of underwater vehicles. By injecting polymers into the surface or boundary layer of a submerged vehicle, the flow state of the water can be effectively changed, reducing the direct contact between water and the surface of the submerged vehicle, thereby reducing resistance.

[0004] However, the actual application effect of polymer drag reduction technology is affected by many factors, such as polymer type, concentration, injection method, flow field conditions, etc. Therefore, real-time monitoring and analysis of the changes in the flow field around the submersible body after polymer injection is of great significance for evaluating the drag reduction effect of polymers and optimizing drag reduction technology.

[0005] At present, the flow field test platform for polymer drag reduction technology has the following main problems: first, the test accuracy is not high and cannot accurately reflect the changes in the flow field after polymer injection; second, the test parameters are single and cannot comprehensively evaluate the drag reduction effect of the polymer; third, the test system is complex to operate and is not conducive to practical application.

[0006] Therefore, developing a high-precision, multi-parameter, easy-to-operate flow field test platform around a submersible body injected with polymer is of great significance for promoting the development and application of polymer drag reduction technology. Summary of the invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the test accuracy is low and cannot accurately reflect the changes in the flow field after polymer injection, thereby providing a flow field test device, working method and system around a submersible body injected with polymer.

[0008] In order to solve the above technical problems, the present invention provides a flow field testing device around a polymer-injected submersible body, comprising: a towing pool, a driving device is provided above the towing pool, the driving device is connected to the submersible body model, and drives the submersible body model to move in the towing pool; a polymer injection system, connected to the submersible body model; a flow field testing system, comprising a flow velocity measuring device, a particle image velocimetry system and a pressure detection component, the pressure detection component is provided on the submersible body model, and the pressure detection component is connected to the flow velocity measuring device and the particle image velocimetry system; a data processing system, comprising a laser, a high-speed camera and a data acquisition computer, the laser is provided below the towing pool, the high-speed camera is used to photograph the submersible body model, and the high-speed camera is connected to the data acquisition computer.

[0009] Furthermore, the submersible body model includes a submarine hull, a keel, a dorsal fin and a tail fin, wherein the keel is arranged inside the submarine hull, the dorsal fin is arranged on the back of the submarine hull, and the tail fin is arranged on the tail of the submarine hull.

[0010] Furthermore, the submarine hull is provided with a front-end injection slit, a middle-end injection slit, and a solution injection chamber, the front-end injection slit is arranged on the front-end outer wall of the submarine hull, the middle-end injection slit is arranged on the middle-end outer wall of the submarine hull, and the solution injection chamber is arranged inside the submarine hull.

[0011] Furthermore, the front end of the submarine hull is provided with a front solution cavity water pipe access port, the middle end of the submarine hull is provided with a middle solution cavity water pipe access port, and the rear end of the submarine hull is provided with a solution water pipe external access port.

[0012] Furthermore, a solution water pipe passage opening is provided inside the submarine hull.

[0013] Furthermore, a front end water pipe passing opening is provided at the front end of the submarine hull, and a first middle end water pipe passing opening and a second middle end water pipe passing opening are provided at the middle end of the submarine hull.

[0014] Furthermore, the polymer injection system includes a solution tank, a solution water pump, and a solution water pipe, one end of the solution water pipe is connected to the solution tank, and the other end is connected to the submersible body model, and the solution water pump is arranged on the solution water pipe.

[0015] Furthermore, it also includes a model fixing bracket, which is arranged on the driving device, and the submersible body model is arranged on the model fixing bracket.

[0016] The present invention also provides a working method of the flow field testing device around a submersible body using the polymer injection, comprising:

[0017] The submersible body model is fixed on the driving device and then placed in the towing tank. The submersible body model is connected to the polymer injection system, and the polymer solution is injected into the submersible body model; the polymer solution injection system is started, and the polymer solution is injected into the boundary layer of the submersible body model according to the preset polymer concentration and injection speed; tracer particles are sprinkled into the towing tank, the particle image velocimetry system is turned on, the laser is shot into the towing tank from below, and the high-speed camera takes pictures of the flow field from the side, and the flow velocity distribution, particle motion trajectory and pressure distribution data in the flow field are collected; the data processing system receives the data collected by the flow field test system, performs real-time processing and analysis, obtains quantitative information on flow field changes, and evaluates the drag reduction effect of the polymer and its impact on the performance of the submersible body.

[0018] The present invention also provides a polymer injection flow field test system around a submersible body, comprising the polymer injection flow field test device around a submersible body.

[0019] The technical solution of the present invention has the following advantages:

[0020] The device for testing the flow field around a polymer-injected submersible body provided by the present invention comprises: a towing pool, wherein a driving device is provided above the towing pool, wherein the driving device is connected to a submersible body model and drives the submersible body model to move in the towing pool; a polymer injection system, which is connected to the submersible body model; a flow field testing system, which comprises a flow velocity measuring device, a particle image velocimetry system and a pressure detection component, wherein the pressure detection component is provided on the submersible body model, and the pressure detection component is connected to the flow velocity measuring device and the particle image velocimetry system; and a data processing system, which comprises a laser, a high-speed camera and a data acquisition computer, wherein the laser is provided below the towing pool, the high-speed camera is used to photograph the submersible body model, and the high-speed camera is connected to the data acquisition computer.

[0021] By setting a driving device on the towing pool, the driving device can be used to drive the submersible body model to move in the towing pool; at the same time, the polymer injection system is connected to the submersible body model, so that the polymer solution in the polymer injection system is injected into the submersible body model, and a boundary layer is formed on the outer wall of the submersible body model. The pressure detection part in the flow field test system is then used to monitor the pressure distribution at each point on the surface of the submersible body model, the flow velocity measurement device is used to measure the flow velocity distribution in the flow field, and the particle image velocimetry system is used to record and analyze the movement trajectory of tiny particles in the flow field, so as to obtain dynamic change information of the flow field. And through the data processing system, the data collected by the flow field test system is received, and real-time processing and analysis are performed to obtain quantitative information on flow field changes, and the drag reduction effect of the polymer and its impact on the performance of the submersible body are evaluated.

[0022] The polymer injection flow field test device around the submersible body can accurately control the polymer solution to be injected into the boundary layer of the submersible body model, and use a multi-parameter test system to monitor and analyze the flow field changes in real time, so as to accurately evaluate the drag reduction effect of the polymer and its impact on the performance of the submersible body. It has the advantages of high test accuracy, simple operation, and strong real-time performance, and provides strong technical support for the research and application of submersible body drag reduction technology.

[0023] The polymer-injected flow field test device around a submersible body is equipped with a particle image velocimetry system, which can simultaneously record particle images of the flow field in a certain spatial region and extract velocity information of multiple spatial points therefrom. It has instantaneous image acquisition capability and high spatial resolution, and can detect transient spatial structures even in unsteady flows, thereby ensuring the accuracy of experimental data. At the same time, it has high repeatability. When taking particle images, the polymer-injected flow field test device around a submersible body will save information about the flow velocity field, such as acquisition frequency, image magnification, etc. This facilitates post-processing and calculation of images in different ways, and even allows data to be reanalyzed when needed without repeating the experiment, thereby improving the repeatability of the experiment.

[0024] The polymer injection flow field test device around the submersible body has high experimental flexibility. Through multiple drag reducer options, the test device can flexibly select different types of polymers as drag reducers, such as high molecular polymers and certain surfactants. These drag reducers have different behavioral characteristics in the fluid. Through comparative experiments, we can deeply understand the drag reduction effect and mechanism of different drag reducers.

[0025] The polymer injection flow field test device around the submersible body uses boundary layer injection to inject the drag reducer into the fluid. This method can accurately control the injection position and injection amount of the drag reducer, so as to study the influence of different injection conditions on the drag reduction effect.

[0026] The polymer is injected into the flow field test device around the submersible body to simulate the complex flow environment, which can simulate the complex flow environment around the submersible body, such as turbulent boundary layer, flow under different Reynolds number conditions, etc. This helps to study the drag reduction effect and mechanism of polymers under different flow environments, and provide theoretical support for practical applications.

[0027] To achieve visualization research, the test device is usually equipped with visualization research methods, such as laser induced fluorescence technology, etc. These technologies can intuitively observe the diffusion of drag reducers in the fluid, concentration distribution, and changes in velocity field, so as to gain a deeper understanding of the drag reduction mechanism.

[0028] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 The overall structure diagram of the flow field test device around the submersible body injected with polymer provided by the present invention;

[0031] Figure 2 A front view of a submersible body model of a device for testing the flow field around a submersible body by injecting polymer provided by the present invention;

[0032] Figure 3 A cross-sectional view of a middle-end injection slit of a flow field test device for injecting polymer around a submersible body provided by the present invention;

[0033] Figure 4 A cross-sectional view of the front end injection slit of the flow field test device for injecting polymer around a submersible body provided by the present invention;

[0034] Figure 5 A top view of a submersible body model of a device for testing the flow field around a submersible body by injecting a polymer provided by the present invention;

[0035] Figure 6 A bottom view of a submersible body model of a device for testing the flow field around a submersible body by injecting polymer provided by the present invention;

[0036] Figure 7 A cross-sectional view of a submersible body model of a device for testing the flow field around a submersible body injected with a polymer provided by the present invention;

[0037] Figure 8 A front view of a submersible body model of a device for testing the flow field around a submersible body by injecting a polymer provided by the present invention;

[0038] Fig. 9 The figure is a left view of a submersible body model of a device for testing the flow field around a submersible body by injecting polymer provided by the present invention.

[0039] Description of reference numerals:

[0040] 1. Solution tank; 2. Solution water pump; 3. Solution water pipe; 4. Submersible body model; 5. Model fixing bracket; 6. Driving device; 7. Front injection slit; 8. Dorsal fin; 9. Middle injection slit; 10. Submarine hull; 11. Tail; 12. Solution injection chamber; 13. Solution water pipe through-port; 14. Keel through-port; 15. Front solution cavity water pipe access port; 16. Middle solution cavity water pipe access port; 17. Front water pipe through-port; 18. First middle water pipe through-port; 19. Second middle water pipe through-port; 20. Solution water pipe external access port; 21. Laser; 22. High-speed camera; 23. Data acquisition computer; 24. Towing tank. DETAILED DESCRIPTION

[0041] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0042] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0043] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0044] In the present disclosure, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] The disclosure below provides many different embodiments or examples to realize different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present disclosure. In addition, the present disclosure can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0046] The preferred embodiments of the present disclosure are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0047] See also Figures 1 to 9 As shown, the present invention provides a flow field testing device around a polymer-injected submersible body, comprising: a towing pool 24, a driving device 6 is provided above the towing pool 24, the driving device 6 is connected to the submersible body model 4, and drives the submersible body model 4 to move in the towing pool 24; a polymer injection system, connected to the submersible body model 4; a flow field testing system, comprising a flow velocity measuring device, a particle image velocimetry system and a pressure detection component, the pressure detection component is provided on the submersible body model 4, and the pressure detection component is connected to the flow velocity measuring device and the particle image velocimetry system; a data processing system, comprising a laser 21, a high-speed camera 22 and a data acquisition computer 23, the laser 21 is provided below the towing pool 24, the high-speed camera 22 is used to photograph the submersible body model 4, and the high-speed camera 22 is connected to the data acquisition computer 23.

[0048] By setting a driving device 6 on the towing pool 24, the driving device 6 can be used to drive the submersible body model 4 to move in the towing pool 24; at the same time, the polymer injection system is connected to the submersible body model 4, so that the polymer solution in the polymer injection system is injected into the submersible body model 4, and a boundary layer is formed on the outer wall of the submersible body model 4. The pressure detection part in the flow field test system is then used to monitor the pressure distribution at each point on the surface of the submersible body model 4, the flow velocity measurement device is used to measure the flow velocity distribution in the flow field, and the particle image velocimetry system is used to record and analyze the movement trajectory of tiny particles in the flow field, so as to obtain the dynamic change information of the flow field. And through the data processing system, the data collected by the flow field test system is received, and real-time processing and analysis are performed to obtain quantitative information on the flow field change, and the drag reduction effect of the polymer and its influence on the performance of the submersible body are evaluated.

[0049] The polymer injection flow field test device around the submersible body can accurately control the polymer solution to be injected into the boundary layer of the submersible body model 4, and use a multi-parameter test system to monitor and analyze the flow field changes in real time, so as to accurately evaluate the drag reduction effect of the polymer and its impact on the performance of the submersible body. It has the advantages of high test accuracy, simple operation, strong real-time performance, etc., and provides strong technical support for the research and application of submersible body drag reduction technology.

[0050] The polymer-injected flow field test device around a submersible body is equipped with a particle image velocimetry system, which can simultaneously record particle images of the flow field in a certain spatial region and extract velocity information of multiple spatial points therefrom. It has instantaneous image acquisition capability and high spatial resolution, and can detect transient spatial structures even in unsteady flows, thereby ensuring the accuracy of experimental data. At the same time, it has high repeatability. When taking particle images, the polymer-injected flow field test device around a submersible body will save information about the flow velocity field, such as acquisition frequency, image magnification, etc. This facilitates post-processing and calculation of images in different ways, and even allows data to be reanalyzed when needed without repeating the experiment, thereby improving the repeatability of the experiment.

[0051] The polymer injection flow field test device around the submersible body has high experimental flexibility. Through multiple drag reducer options, the test device can flexibly select different types of polymers as drag reducers, such as high molecular polymers and certain surfactants. These drag reducers have different behavioral characteristics in the fluid. Through comparative experiments, we can deeply understand the drag reduction effect and mechanism of different drag reducers.

[0052] The polymer injection flow field test device around the submersible body uses boundary layer injection to inject the drag reducer into the fluid. This method can accurately control the injection position and injection amount of the drag reducer, so as to study the influence of different injection conditions on the drag reduction effect.

[0053] The polymer is injected into the flow field test device around the submersible body to simulate the complex flow environment, which can simulate the complex flow environment around the submersible body, such as turbulent boundary layer, flow under different Reynolds number conditions, etc. This helps to study the drag reduction effect and mechanism of polymers under different flow environments, and provide theoretical support for practical applications.

[0054] To achieve visualization research, the test device is usually equipped with visualization research methods, such as laser induced fluorescence technology, etc. These technologies can intuitively observe the diffusion of drag reducers in the fluid, concentration distribution, and changes in velocity field, so as to gain a deeper understanding of the drag reduction mechanism.

[0055] The pressure detection component is a pressure sensor, and there are multiple pressure sensors for monitoring the pressure distribution at each point on the surface of the submersible body model 4 .

[0056] The boundary layer is a stable drag-reducing thin layer formed on the surface of the submersible body model, thereby reducing frictional resistance.

[0057] In some optional embodiments, the submersible body model 4 includes a submarine hull 10, a keel, a dorsal fin 8 and a tail fin 11, wherein the keel is arranged inside the submarine hull 10, the dorsal fin 8 is arranged on the back of the submarine hull 10, and the tail fin 11 is arranged at the tail of the submarine hull 10.

[0058] A keel through-hole 14 is provided inside the submarine hull 10 . The keel through-hole 14 is provided to facilitate the passage of a keel (not shown in the figure). Meanwhile, the keel provides fixation for the submarine hull 10 .

[0059] In some optional embodiments, the submarine hull 10 is provided with a front end injection slit 7, a middle end injection slit 9, and a solution injection chamber 12, the front end injection slit 7 is arranged on the front end outer wall of the submarine hull 10, the middle end injection slit 9 is arranged on the middle end outer wall of the submarine hull 10, and the solution injection chamber 12 is arranged inside the submarine hull 10.

[0060] Among them, the polymer injection system is connected to the solution injection chamber 12, and the solution injection chamber 12 is connected to the front injection slit 7 and the middle injection slit 9, that is, the polymer solution is injected into the boundary layer of the submarine hull 10 through the front injection slit 7 and the middle injection slit 9 through the polymer injection system and the solution injection chamber 12.

[0061] In some optional embodiments, the front end of the submarine hull 10 is provided with a front solution cavity water pipe access port 15, the middle end of the submarine hull 10 is provided with a middle solution cavity water pipe access port 16, and the rear end of the submarine hull 10 is provided with a solution water pipe external access port 20.

[0062] The polymer solution in the solution injection chamber 12 enters the front injection slit 7 through the front solution chamber water pipe access port, and enters the middle injection slit 9 through the middle solution chamber water pipe access port 16 .

[0063] Wherein, the polymer solution is a drag reducer.

[0064] Specifically, a solution water pipe passing port 13 is provided inside the submarine hull 10. The solution water pipe passing port 13 is suitable for installing a solution water pipe 3, which is connected to the solution injection chamber 12 to provide the solution injection chamber 12 with a polymer solution.

[0065] In some optional embodiments, the front end of the submarine hull 10 is provided with a front water pipe passage 17, and the middle end of the submarine hull 10 is provided with a first middle water pipe passage 18 and a second middle water pipe passage 19.

[0066] The provision of the front end water pipe passing opening 17 , the first middle end water pipe passing opening 18 and the second middle end water pipe passing opening 19 facilitates the passing of the solution water pipe 3 .

[0067] There are two ways for the polymer solution to flow:

[0068] First, the polymer solution enters the submarine hull 10 through the solution water pipe external access port 20 , then enters the middle injection slit through the solution injection slit, and finally forms a boundary layer on the outer wall of the submarine hull 10 .

[0069] The second method is that the polymer solution passes through the solution water pipe through port 13 or the second middle end water pipe through port 19 and the front end injection slit 7, and finally forms a boundary layer on the outer wall of the submarine hull 10.

[0070] In some optional embodiments, the polymer injection system includes a solution tank 1, a solution water pump 2, and a solution water pipe 3, one end of the solution water pipe 3 is connected to the solution tank 1, and the other end is connected to the submersible body model 4, and the solution water pump 2 is arranged on the solution water pipe 3.

[0071] By providing the solution tank 1 , the solution water pump 2 , and the solution water pipe 3 , the polymer solution in the solution is transported into the submarine hull 10 using the solution water pipe 3 and the solution water pump 2 .

[0072] The device for testing the flow field around a submersible body after polymer injection also includes a model fixing bracket 5 , wherein the model fixing bracket 5 is arranged on the driving device 6 , and the submersible body model 4 is arranged on the model fixing bracket 5 .

[0073] By setting the model fixing bracket 5, it is convenient to install the submersible body model 4 on the model fixing bracket 5, so as to realize the connection between the submersible body model 4 and the driving device 6, and the driving device 6 can be used to drive the submersible body model 4 to move in the towing pool 24.

[0074] The present invention also provides a working method of a flow field testing device around a submersible body by injecting a polymer, comprising:

[0075] The submersible body model 4 is fixed on the driving device 6 and then placed in the towing pool 24. The submersible body model 4 is connected to the polymer injection system, and the polymer solution is injected into the submersible body model 4; the polymer solution injection system is started, and the polymer solution is injected into the boundary layer of the submersible body model 4 according to the preset polymer concentration and injection speed; tracer particles are sprinkled into the towing pool 24, and the particle image velocimetry system is turned on. The laser 21 is shot into the towing pool from below, and the high-speed camera 22 takes flow field photos from the side to collect flow velocity distribution, particle motion trajectory and pressure distribution data in the flow field; the data processing system receives the data collected by the flow field test system, performs real-time processing and analysis, obtains quantitative information on flow field changes, and evaluates the drag reduction effect of the polymer and its influence on the performance of the submersible body.

[0076] The present invention also provides a polymer injection flow field test system around a submersible body, comprising the polymer injection flow field test device around a submersible body.

[0077] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A device for testing the flow field around a submersible body after polymer injection, characterized in that: include: A towing pool (24), wherein a driving device (6) is provided above the towing pool (24), the driving device (6) is connected to the submersible body model (4), and drives the submersible body model (4) to move in the towing pool (24); A polymer injection system connected to the submersible body model (4); The flow field testing system comprises a flow velocity measuring device, a particle image velocity measuring system and a pressure detection component, wherein the pressure detection component is arranged on the submersible body model (4), and the pressure detection component is connected to the flow velocity measuring device and the particle image velocity measuring system; The data processing system comprises a laser (21), a high-speed camera (22) and a data acquisition computer (23), wherein the laser (21) is arranged below a towing pool (24), the high-speed camera (22) is used to photograph a submersible body model (4), and the high-speed camera (22) is connected to the data acquisition computer (23).

2. The device for testing the flow field around a polymer-injected submersible body according to claim 1, characterized in that: The submersible body model (4) comprises a submarine hull (10), a keel, a dorsal fin (8) and a tail fin (11), wherein the keel is arranged inside the submarine hull (10), the dorsal fin (8) is arranged on the back of the submarine hull (10), and the tail fin (11) is arranged on the tail of the submarine hull (10).

3. The device for testing the flow field around a polymer-injected submersible body according to claim 2, characterized in that: A front injection slit (7), a middle injection slit (9), and a solution injection chamber (12) are provided on the submarine hull (10); the front injection slit (7) is provided on the front outer wall of the submarine hull (10); the middle injection slit (9) is provided on the middle outer wall of the submarine hull (10); and the solution injection chamber (12) is provided inside the submarine hull (10).

4. The device for testing the flow field around a polymer-injected submersible body according to claim 3, characterized in that: The front end of the submarine hull (10) is provided with a front solution cavity water pipe access port (15), the middle end of the submarine hull (10) is provided with a middle solution cavity water pipe access port (16), and the rear end of the submarine hull (10) is provided with a solution water pipe external access port (20).

5. The device for testing the flow field around a polymer-injected submersible body according to claim 3, characterized in that: A solution water pipe passing opening (13) is arranged inside the submarine hull (10).

6. The device for testing the flow field around a polymer-injected submersible body according to claim 5, characterized in that: The front end of the submarine hull (10) is provided with a front water pipe passing opening (17), and the middle end of the submarine hull (10) is provided with a first middle water pipe passing opening (18) and a second middle water pipe passing opening (19).

7. The device for testing the flow field around a polymer-injected submersible body according to claim 6, characterized in that: The polymer injection system comprises a solution tank (1), a solution water pump (2), and a solution water pipe (3). One end of the solution water pipe (3) is connected to the solution tank (1), and the other end is connected to the submersible body model (4). The solution water pump (2) is arranged on the solution water pipe (3).

8. The device for testing the flow field around a polymer-injected submersible body according to claim 7, characterized in that: It also comprises a model fixing bracket (5), wherein the model fixing bracket (5) is arranged on the driving device (6), and the submersible body model (4) is arranged on the model fixing bracket (5).

9. A method for testing the flow field around a submersible body by injecting a polymer according to any one of claims 1 to 8, characterized in that: include: The submersible body model (4) is fixed on a driving device (6), and then placed in a towing pool (24); the submersible body model (4) is connected to a polymer injection system, and a polymer solution is injected into the submersible body model (4); The polymer solution injection system is started, and the polymer solution is injected into the boundary layer of the submersible body model (4) according to the preset polymer concentration and injection speed; tracer particles are sprinkled into the towing pool (24), and the particle image velocimetry system is started, and the laser (21) is injected into the towing pool (24) from below, and the high-speed camera (22) takes flow field photos from the side to collect flow velocity distribution, particle motion trajectory and pressure distribution data in the flow field; the data processing system receives the data collected by the flow field test system, performs real-time processing and analysis, obtains quantitative information on flow field changes, and evaluates the drag reduction effect of the polymer and its influence on the performance of the submersible body.

10. A polymer injection flow field test system around a submersible body, characterized in that: A flow field testing device around a polymer-injected submersible body according to any one of claims 1-8.

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