Polymer injection underwater vehicle ambient flow field testing apparatus, method of operation, and system

Abstract

The present application relates to the technical field of ship and ocean engineering, in particular to a polymer injection surrounding flow field testing device for submerged vehicle, a working method and a system; the testing device comprises: a towing tank, a driving device is arranged above the towing tank, the driving device is connected with a submerged vehicle model and drives the submerged vehicle model to move in the towing tank; a polymer injection system is connected with the submerged vehicle model; a flow field testing system comprises a flow velocity measuring device, a particle image velocimetry system and a pressure detection piece, the pressure detection piece is arranged on the submerged vehicle model, and the pressure detection piece is connected with the flow velocity measuring device and the particle image velocimetry system. The boundary layer of the polymer solution injected into the submerged vehicle model can be accurately controlled, and the flow field change can be monitored and analyzed in real time by using a multi-parameter testing system; the testing device has the advantages of high testing precision, simple operation, strong real-time performance and the like, and provides strong technical support for the research and application of the drag reduction technology of the submerged vehicle.

Description

Technical Field

[0001] The present 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 for injecting polymer into the surrounding of a submersible body. Background Art

[0002] With the continuous development of underwater navigation technology, the drag problem faced by submersible bodies during underwater navigation has become increasingly prominent. When a submersible body moves underwater, friction is generated between its surface and the surrounding water. This friction consumes a large amount of energy, limiting the speed and range of the submersible body. Therefore, reducing the surface drag of a submersible body has become a key research direction for improving its performance.

[0003] In recent years, polymer drag reduction technology has shown great potential in reducing the 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 direct contact between the water and the surface of the submerged vehicle, thereby reducing drag.

[0004] However, the actual application effect of polymer drag reduction technology is affected by many factors, such as polymer type, concentration, injection method, and flow field conditions. Therefore, real-time monitoring and analysis of changes in the flow field around the submersible 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 testing platform for polymer drag reduction technology has the following main problems: first, the test accuracy is not high, and it cannot accurately reflect the changes in the flow field after polymer injection; second, the test parameters are single, and it is impossible to comprehensively evaluate the drag reduction effect of the polymer; third, the test system operation is complicated, which 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 testing device, working method and system around a polymer-injected submersible body.

[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 at the tail of the submarine hull.

[0010] Furthermore, the submarine hull is provided with a front injection slit and a middle injection slit, as well as a solution injection chamber. The front injection slit is arranged on the front outer wall of the submarine hull, the middle injection slit is arranged on the middle 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, the front end of the submarine hull is provided with a front water pipe passing opening, and the middle end of the submarine hull is provided with a first middle end water pipe passing opening and a second middle end water pipe passing opening.

[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 method, 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 interior of 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 a high-speed camera 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 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 present invention provides a device for testing the flow field around a polymer-injected submersible body, comprising: a towing pool, wherein a driving device is provided above the towing pool, 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, 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, wherein the pressure detection component is provided on the submersible body model and connected to the flow velocity measuring device and the particle image velocimetry system; and a data processing system, comprising 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 installing a drive device on the towing tank, the submersible model can be driven to move within the towing tank. Simultaneously, a polymer injection system is connected to the submersible model, allowing the polymer solution in the system to be injected into the model, forming a boundary layer on the model's outer wall. Pressure sensors within the flow field testing system monitor the pressure distribution at various points on the model's surface. A flow velocity measurement device measures the velocity distribution within the flow field, and a particle image velocimetry system records and analyzes the motion trajectories of tiny particles within the flow field, thereby obtaining information on dynamic changes in the flow field. A data processing system receives data collected by the flow field testing system, processes and analyzes it in real time, and obtains quantitative information on flow field changes, enabling evaluation of the polymer's drag reduction effect and its impact on the submersible model's performance.

[0022] This polymer injection flow field test device around a submersible body precisely controls the injection of polymer solution into the boundary layer of a submersible body model. Using a multi-parameter test system, it monitors and analyzes flow field changes in real time, accurately assessing the polymer's drag reduction effect and its impact on the submersible's performance. With its high test accuracy, ease of operation, and strong real-time performance, it provides strong technical support for the research and application of submersible body drag reduction technology.

[0023] The device for testing the flow field around a polymer-injected 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 from multiple spatial points. It has instantaneous image acquisition capabilities and high spatial resolution, allowing it to detect transient spatial structures even in unsteady flows, thereby ensuring the accuracy of experimental data. At the same time, it has high repeatability. When capturing particle images, the device for testing the flow field around a polymer-injected submersible body saves information about the flow velocity field, such as acquisition frequency and image magnification. This facilitates post-processing and calculation of the images in different ways, and even allows for reanalysis of the data when needed, without the need to repeat the experiment, thereby improving the repeatability of the experiment.

[0024] The polymer injection flow field test device around a submersible body offers high experimental flexibility. With a wide selection of drag reducers, the test device can flexibly select different types of polymers as drag reducers, such as high molecular weight polymers and certain surfactants. These drag reducers have different behavioral characteristics in fluids, and comparative experiments can provide a deeper understanding of the drag reduction effects and mechanisms of different drag reducers.

[0025] The polymer injection flow field test device around a submersible body uses boundary layer injection to inject the drag reducer into the fluid. This method can precisely control the injection position and injection volume of the drag reducer, thereby studying the impact of different injection conditions on the drag reduction effect.

[0026] The polymer was injected into a flow field test device around a submersible body to simulate complex flow environments, such as turbulent boundary layers and flows under different Reynolds numbers. This facilitates research into the drag reduction effects and mechanisms of polymers in different flow environments, providing 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. These technologies can directly observe the diffusion, concentration distribution, and velocity field changes of the drag reducer in the fluid, thereby gaining 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 embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 This is an overall structural diagram of the flow field testing device around a 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 the middle injection slit of the device for testing the flow field around a submersible body by injecting polymer provided by the present invention;

[0033] Figure 4 A cross-sectional view of the front injection slit of the flow field testing 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 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 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 polymer provided by the present invention;

[0038] Figure 9 This is a left view of a submersible body model of the 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. Drive 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-end water pipe through-port; 19. Second middle-end 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] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and description are to be considered as illustrative in nature and not restrictive.

[0042] In the description of the present disclosure, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely for the purpose of facilitating the description of the present disclosure and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the present disclosure, "plurality" means two or more, unless otherwise expressly and specifically defined.

[0043] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, removable, or integral connections; mechanical, electrical, or intercommunication connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0044] In this disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is at a lower level than the second feature.

[0045] The disclosure below provides many different embodiments or examples for realizing different structures of the present disclosure. In order to simplify the disclosure of the present disclosure, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present disclosure provides examples of various specific processes and materials, but those of ordinary skill in the art will appreciate 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 installing a drive device 6 on the towing tank 24, the submersible model 4 can be driven to move within the towing tank 24. Simultaneously, a polymer injection system is connected to the submersible model 4, allowing the polymer solution in the system to be injected into the submersible model 4, forming a boundary layer on the outer wall of the submersible model 4. Pressure sensors within the flow field testing system monitor the pressure distribution at various points on the surface of the submersible model 4. A flow velocity measurement device measures the flow velocity distribution within the flow field, and a particle image velocimetry system records and analyzes the motion trajectories of tiny particles within the flow field, thereby obtaining information on dynamic changes in the flow field. The data collected by the flow field testing system is received by a data processing system for real-time processing and analysis, yielding quantitative information on flow field changes and enabling evaluation of the polymer's drag reduction effect and its impact on the performance of the submersible model.

[0049] This polymer injection flow field testing device can precisely control the injection of polymer solution into the boundary layer of a submersible model 4. Using a multi-parameter testing system, it monitors and analyzes flow field changes in real time, accurately assessing the polymer's drag reduction effect and its impact on the submersible's performance. With its high test accuracy, ease of operation, and strong real-time performance, it provides strong technical support for the research and application of submersible drag reduction technology.

[0050] The device for testing the flow field around a polymer-injected 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 from multiple spatial points. It has instantaneous image acquisition capabilities and high spatial resolution, allowing it to detect transient spatial structures even in unsteady flows, thereby ensuring the accuracy of experimental data. At the same time, it has high repeatability. When capturing particle images, the device for testing the flow field around a polymer-injected submersible body saves information about the flow velocity field, such as acquisition frequency and image magnification. This facilitates post-processing and calculation of the images in different ways, and even allows for reanalysis of the data when needed, without the need to repeat the experiment, thereby improving the repeatability of the experiment.

[0051] The polymer injection flow field test device around a submersible body offers high experimental flexibility. With a wide selection of drag reducers, the test device can flexibly select different types of polymers as drag reducers, such as high molecular weight polymers and certain surfactants. These drag reducers have different behavioral characteristics in fluids, and comparative experiments can provide a deeper understanding of the drag reduction effects and mechanisms of different drag reducers.

[0052] The polymer injection flow field test device around a submersible body uses boundary layer injection to inject the drag reducer into the fluid. This method can precisely control the injection position and injection volume of the drag reducer, thereby studying the impact of different injection conditions on the drag reduction effect.

[0053] The polymer was injected into a flow field test device around a submersible body to simulate complex flow environments, such as turbulent boundary layers and flows under different Reynolds numbers. This facilitates research into the drag reduction effects and mechanisms of polymers in different flow environments, providing 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. These technologies can directly observe the diffusion, concentration distribution, and velocity field changes of the drag reducer in the fluid, thereby gaining 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 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 passage opening 14 is provided inside the submarine hull 10 . The keel passage opening 14 facilitates the passage of a keel (not shown in the figure). At the same time, the keel provides fixation for the submarine hull 10 .

[0059] In some optional embodiments, the submarine hull 10 is provided with a front injection slit 7, a middle injection slit 9, and a solution injection chamber 12, 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.

[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 pipe passage 13 is provided inside the submarine hull 10. The solution pipe passage 13 is suitable for installing a solution 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 through-port 17, and the middle end of the submarine hull 10 is provided with a first middle water pipe through-port 18 and a second middle water pipe through-port 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 passage of the solution water pipe 3 .

[0067] Among them, the flow of polymer solution has two pathways:

[0068] First, the polymer solution enters the interior of the submarine hull 10 through the solution water pipe external inlet 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 is transported into the submarine hull 10 using the solution water pipe 3 and the solution water pump 2 .

[0072] The polymer injection flow field test device around the submersible body also includes a model fixing bracket 5, which 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, thereby realizing 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 method for testing a flow field 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 interior of 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 injected 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 testing 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.

[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 clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A device for testing the flow field around a polymer-injected submersible body, 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); A flow field testing system includes a flow velocity measuring device, a particle image velocity measuring system and a pressure detection component, wherein the pressure detection component is arranged on a 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 includes a laser (21), a high-speed camera (22) and a data acquisition computer (23), wherein the laser (21) is arranged below the towing pool (24), the high-speed camera (22) is used to photograph the submersible model (4), and the high-speed camera (22) is connected to the data acquisition computer (23); 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); 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); The polymer solution in the solution injection chamber (12) enters the front injection slit (7) through the front solution chamber water pipe access port (15), and enters the middle injection slit (9) through the middle solution chamber water pipe access port (16).

2. The device for testing the flow field around a polymer-injected submersible body according to claim 1, characterized in that: The submarine 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 1, characterized in that: A solution water pipe passing port (13) is provided inside the submarine hull (10).

4. The device for testing the flow field around a polymer-injected submersible body according to claim 1, 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).

5. The device for testing the flow field around a polymer-injected submersible body according to claim 1, 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 model (4). The solution water pump (2) is arranged on the solution water pipe (3).

6. The device for testing the flow field around a polymer-injected submersible body according to claim 1, characterized in that: It also includes a model fixing bracket (5), which is arranged on the driving device (6), and the submersible body model (4) is arranged on the model fixing bracket (5).

7. A method for testing the flow field around a submersible body by injecting a polymer according to any one of claims 1 to 6, 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. 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.

8. 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 to 6.

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