Device for reducing shear oscillation line spectrum peak value of pore cavity opening of underwater vehicle

Abstract

The invention relates to a device for reducing an underwater vehicle pore cavity opening shear oscillation line spectrum peak value, and the device comprises a light housing which is provided with a plurality of openings in the surface; the bending plate assembly is connected to the edge of the side, facing fluid, of the opening, the bending plate assembly comprises a plate body, a fixed end and a height adjuster, the fixed end is fixedly connected to the edge of the opening, the plate body is rotationally connected to the fixed end, and the height adjuster is connected between the lower end of the plate body and the inner side of the opening. According to the device for reducing the shear oscillation line spectrum peak value of the pore cavity opening of the underwater navigation body, the inclined bent plate type structure is installed at the pore cavity opening of the underwater navigation body, and efficient hydrodynamic optimization of navigation bodies with different speeds is achieved. The obliquely-arranged bent plate assembly can effectively guide energy of the shear layer to be dispersed obliquely upwards, the collision energy of a shear layer vortex system and the trailing edge of the hole cavity is remarkably reduced, and then the energy feedback and shear oscillation line spectrum peak value is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of underwater vehicle, in particular to a device for reducing the peak value of shear oscillation line spectrum of a cavity opening of an underwater vehicle. Background Art

[0002] In the field of underwater vehicle technology, various types of underwater vehicles, such as submarines, unmanned underwater vehicles, and underwater detectors, often need to have cavity openings on their shells in order to achieve their designed functions. These openings are not only used for exhaust and drainage to ensure the normal operation of the internal system of the vehicle, but may also be used for other specific functional requirements, such as sensor installation and communication equipment layout. However, when free flow (such as water flow) flows through these cavity openings, a series of complex flow phenomena will be triggered.

[0003] Specifically, when water flows over the leading edge of the cavity opening, the flow separates and a shear layer is generated. This shear layer forms a low-speed flow area below the cavity opening, while the flow speed above it is close to the free stream speed. Due to the existence of this velocity gradient, the shear layer becomes unstable and amplifies the disturbance. This instability causes the shear layer to begin to swing up and down and spread along with the flow to the trailing edge of the cavity opening.

[0004] When the shear layer reaches the trailing edge, it collides with it, generating pressure pulses. These pressure pulses propagate upstream at a certain speed and are fed back to the leading edge of the cavity opening. Under certain phase conditions, the disturbance of the shear layer will form a closed feedback loop, which will then generate self-sustaining oscillations. This oscillating fluid, as a pulsating pressure source, may not only generate monotonic or broadband noise, but may also excite the structures around the cavity to generate vibrations and noise, ultimately forming a shear oscillation line spectrum of the cavity opening.

[0005] In order to reduce the peak value of the shear oscillation line spectrum of the bore opening of the underwater vehicle and reduce the impact of the resulting noise and vibration on the performance of the vehicle, effective measures need to be taken to reduce the collision energy of the shear layer vortex system hitting the trailing edge of the bore opening. The present invention proposes an innovative method, namely, installing an inclined curved plate structure on the leading edge guide. This structure can guide the energy of the shear layer obliquely upward, so that the vortex system caused by the discontinuity of the guide edge moves obliquely upward with the flow, thereby reducing the probability of its collision with the trailing edge of the bore. In this way, the collision energy of the trailing edge of the bore opening can be effectively reduced, thereby reducing energy feedback, and achieving the purpose of reducing the peak value of the shear oscillation line spectrum of the bore opening of the underwater vehicle.

[0006] Therefore, the present invention proposes a practical and effective method and device for reducing the peak value of the shear oscillation line spectrum of the cavity opening of the underwater vehicle, which is of great significance for improving the stealth, stability and overall performance of the underwater vehicle. Summary of the invention

[0007] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a device for reducing the peak value of the shear oscillation line spectrum of the cavity opening of the underwater vehicle, and realizes the efficient fluid dynamics optimization of the vehicle at different speeds by installing an inclined curved plate structure at the cavity opening of the underwater vehicle. The inclined curved plate assembly can effectively guide the shear layer energy to disperse obliquely upward, significantly reducing the collision energy between the shear layer vortex system and the trailing edge of the cavity, thereby reducing energy feedback and the peak value of the shear oscillation line spectrum.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A device for reducing the peak value of shear oscillation line spectrum of a bore opening of an underwater vehicle, comprising:

[0010] A light shell having a plurality of openings formed on its surface;

[0011] A curved plate assembly is connected to the edge of the opening facing the fluid, and includes a plate body, a fixed end and a height adjuster, wherein the fixed end is fixedly connected to the edge of the opening, the plate body is rotatably connected to the fixed end, and the height adjuster is connected between the lower end of the plate body and the inner side of the opening to adjust the height of the plate body.

[0012] Furthermore, the width of the plate body is not less than the width of the opening, and the rotation angle of the plate body is between 0 and 30 degrees, and the size of the rotation angle is inversely proportional to the moving speed of the navigation body.

[0013] Furthermore, the ratio of the curvature radius R of the plate body to the height H is 1:(1 / 2-2 / 3), and the curvature radius R of the plate body is 1 / 5-1 / 10 of the opening length.

[0014] Furthermore, the opening is a rectangular structure or any shape, and the fixed end is flush with the horizontal plane of the leading edge of the opening.

[0015] Furthermore, the driving method of the height adjuster includes telescopic equipment such as electric poles and hydraulic poles.

[0016] Furthermore, it also includes a pressure-resistant shell, on the surface of which the light outer shell is connected via a plurality of vertically connected partitions.

[0017] Furthermore, the bending plate assembly is a fixed structure, whose width is equal to the opening width, and the rotation angle of the plate body is 0 degrees. The curvature radius R of the plate body is twice the height H1 of its movable end, and is mainly suitable for underwater vehicles with faster speeds.

[0018] Furthermore, when the speed of the underwater vehicle reaches a predetermined speed, the vortex is lifted up by the plate, and its landing point is located behind the trailing edge of the opening, thus avoiding energy feedback caused by the collision between the vortex and the trailing edge of the opening.

[0019] Furthermore, the bending plate assembly is a fixed structure, whose width is equal to the opening width, and the rotation angle of the plate body is 30 degrees. The curvature radius R of the plate body is 1.5 times the height H2 of its movable end, and is mainly suitable for underwater vehicles with slower speeds.

[0020] Furthermore, the outwardly extending plate body can improve the stability of the navigation body, while ensuring that when the speed of the underwater navigation body reaches a predetermined speed, the vortex system is lifted up under the action of the plate body and the landing point is located behind the trailing edge of the opening, thereby avoiding energy feedback caused by the collision between the vortex system and the trailing edge of the opening.

[0021] The beneficial effects of the present invention are as follows:

[0022] The present invention has a compact and reasonable structure and is easy to operate. By installing an inclined curved plate structure at the opening of the cavity of the underwater vehicle, efficient fluid dynamics optimization of vehicles at different speeds is achieved. The inclined curved plate assembly can effectively guide the shear layer energy to disperse obliquely upward, significantly reducing the collision energy between the shear layer vortex system and the trailing edge of the cavity, thereby reducing energy feedback and shear oscillation line spectrum peaks. For high-speed vehicles, by adjusting the angle and size of the plate body, the control stability is improved, and the noise and vibration caused by turbulence are reduced; for low-speed vehicles, the outward-extending plate body design enhances static stability, reduces noise, and improves stealth.

[0023] At the same time, the present invention also has the following advantages:

[0024] (1) Significantly reduce noise and vibration and improve stealth performance. This device effectively reduces the peak value of the shear oscillation line spectrum of the underwater vehicle cavity opening by introducing an inclined curved plate structure. This structure can guide the fluid to bypass the opening, reduce the formation and shedding of vortices, and thus significantly reduce noise and vibration. This design is particularly important when sailing at high speeds. It greatly improves the stealth performance of the vehicle and enables the vehicle to approach the target more stealthily. In addition, by flexibly adjusting the height of the plate through the height adjuster, the device can adapt to the needs of different flow rates and vehicle speeds, ensuring excellent noise reduction effects under different working conditions. This design not only improves the stealth of the vehicle, but also provides a strong guarantee for its safe operation in complex underwater environments.

[0025] (2) Optimize fluid dynamics performance and reduce energy consumption. The inclined curved plate structure of this device has been carefully designed to optimize the curvature radius and height ratio of the plate, thereby improving the overall fluid dynamics performance of the underwater vehicle. This design allows the fluid to bypass the plate more smoothly when flowing through the opening, reducing the occurrence of flow separation and turbulence, thereby reducing energy consumption. At the same time, by guiding the movement trajectory of the vortex system, the collision between the vortex system and the trailing edge of the opening is avoided, further reducing energy feedback. This sophisticated fluid dynamics design enables the vehicle to maintain excellent performance in a complex underwater environment and adapt to different mission requirements. In addition, the device also improves the speed and stability of the vehicle, providing strong support for the efficient operation of the underwater vehicle.

[0026] (3). The structure is simple and easy to maintain, which improves practicality and economy. The device adopts a simple and effective structural design, which is easy to install and maintain. The fixed end of the curved plate assembly is directly connected to the edge of the opening, and the plate body can be flexibly adjusted in height through the height adjuster. This design not only improves the reliability of the device, but also reduces the complexity of maintenance. At the same time, the various components of the device are made of durable materials and can operate stably for a long time in harsh underwater environments. In addition, the design of the device is highly versatile and can be applied to openings of different shapes and sizes, which increases its flexibility and applicability in practical applications. This simple and efficient design not only improves the service life of the device, but also reduces the overall cost, and has high economy and practicality. This is undoubtedly an important advantage for the long-term operation and maintenance of underwater navigation bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the present invention.

[0028] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.

[0029] Figure 3 This is a diagram showing the dimensional changes of the bent plate assembly in the present invention.

[0030] Figure 4 It is a schematic diagram of the test results of the pulsating pressure at the leading edge of the cavity with and without the inclined curved plate guide structure of the present invention.

[0031] Figure 5 It is a schematic diagram of the test results of the pulsating pressure at the rear edge of the cavity with and without the inclined curved plate guide structure of the present invention.

[0032] in:

[0033] 100, pressure hull; 200, light outer shell; 300, partition; 400, opening; 500, bent plate assembly; 501, plate body; 502, fixed end; 503, height adjuster. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] A device for reducing the peak value of the shear oscillation line spectrum of the cavity opening of an underwater vehicle comprises a light shell 200, a plurality of openings 400 are opened on the surface of the light shell 200, and an inclined curved plate assembly 500 is connected to the edge of the side of the opening 400 facing the fluid.

[0037] like Figure 2 As shown, the curved plate assembly 500 includes a plate body 501, a fixed end 502 and a height adjuster 503; the fixed end 502 is fixedly connected to the edge of the opening 400, the plate body 501 is rotatably connected to the fixed end 502, and the lower end of the plate body 501 is connected to a height adjuster 503 that drives it to move in a direction perpendicular to the fluid, the height adjuster 503 is connected to the inner side of the opening 400, and the driving mode of the height adjuster 503 includes telescopic devices such as electric poles and hydraulic poles. The height of the plate body 501 can be flexibly adjusted by the height adjuster 503 to meet the needs of different flow rates and navigation body speeds. When the water flows through, the inclined setting of the plate body 501 can effectively guide the shear layer energy to disperse obliquely upward, reducing the collision energy of the shear layer vortex system with the trailing edge of the cavity. This design not only reduces energy feedback, but also helps to reduce noise and vibration, and improve the stealth and stability of the underwater navigation body.

[0038] like Figure 3 As shown, the width of the plate body 501 is not less than the width of the opening 400. The rotation angle α of the plate body 501 in this embodiment is between 0-30 degrees, that is, the plate body 501 rotates within the range of 0-30° in the horizontal plane. If the rotation angle is greater than 30°, the overall resistance is too large. At the same time, the size of the rotation angle is inversely proportional to the moving speed of the navigation body. When the moving speed of the navigation body is too fast, the rotation angle of the plate body 501 decreases. The width of the plate body 501 is designed to be not less than the width of the opening 400, ensuring that the entire opening area can be effectively covered, avoiding the shear layer vortex system from directly colliding with the trailing edge of the cavity without being guided. At the same time, the rotation angle of the plate body 501 is limited to between 0-30 degrees, which not only ensures the guiding effect, but also avoids increasing resistance due to excessive angles. This design enables the navigation body to maintain better fluid mechanics performance at different speeds, which helps to reduce energy consumption and improve navigation efficiency.

[0039] In this embodiment, at the same time, the curvature radius R of the plate body 501: the height H of the plate body 501 (the height of the movable end of the plate body 501 from the horizontal plane) = 1: (1 / 2-2 / 3); the curvature radius R of the plate body is 1 / 5-1 / 10 of the length of the opening 400 (the length in the flow direction). The proportional design of the curvature radius R and the height H of the plate body 501, as well as the proportional design of the curvature radius R and the length of the opening 400, are all optimized based on the principles of fluid mechanics. These proportional designs can ensure that the plate body 501 has the best fluid dynamics effect when guiding the shear layer vortex system, which can effectively disperse the shear layer energy and avoid generating additional resistance. This sophisticated design helps to improve the overall performance of the navigation body and reduce operating costs.

[0040] In this embodiment, the opening 400 is a rectangular structure, and can also be any shape in actual use. The shape design of the opening 400 is flexible and diverse, and can be adjusted according to actual needs, which increases the applicability and versatility of the device. The underwater navigation body in this embodiment is mainly a submarine, which also includes a pressure hull 100, and the surface of the pressure hull 100 is connected to the light outer shell 200 through a plurality of vertically connected partitions 300, and an opening 400 is opened on the surface of the light outer shell 200. The fixed end 502 is flush with the horizontal plane of the leading edge guide of the opening 400 to avoid flow separation caused by uneven structural steps, thereby causing an increase in turbulence. At the same time, the design that the fixed end 502 is flush with the horizontal plane of the leading edge guide of the opening 400 avoids the flow separation phenomenon caused by the uneven structure, helps to maintain the stability of the fluid and reduce turbulence. This design helps to improve the fluid mechanics performance of the navigation body and reduce energy consumption and noise.

[0041] In summary, an inclined curved plate structure is installed on the leading edge guide to guide the shear layer energy obliquely upward, so that the vortex system caused by the discontinuity of the guide edge moves obliquely upward with the flow, reducing the probability of its collision with the trailing edge of the cavity, thereby achieving the purpose of reducing the collision energy of the trailing edge of the cavity opening, thereby reducing energy feedback and reducing the peak value of the shear oscillation line spectrum of the cavity opening of the underwater vehicle. By adopting an inclined curved plate structure, the device can effectively guide the shear layer energy to disperse obliquely upward, reducing the collision energy of the shear layer vortex system with the trailing edge of the cavity. This design not only reduces energy feedback and noise generation, but also helps to improve the stealth and stability of the vehicle. At the same time, the device has a simple structure, is easy to install and maintain, and has high practicality and economy.

[0042] like Figure 4 and Figure 5As shown in the figure, the laboratory test results show that under the condition of flow velocity of 6m / s, after the installation of the inclined curved plate guide structure, the first three-order shear oscillation peaks at the front and rear edges of the cavity disappear, the peak energy of the leading edge spectrum is reduced by more than 20dB, the wide spectrum of the pulsating pressure at the trailing edge increases, and the relative reduction of the shear oscillation peak is lower than that of the leading edge. The test results show that after the installation of the inclined curved plate guide structure, the shear oscillation peaks at the front and rear edges of the cavity are significantly reduced. This reduction is not only reflected in the reduction of the spectrum peak energy, but also in the relative reduction of the shear oscillation peak. This proves the effectiveness and practicality of the device in reducing the peak of the shear oscillation line spectrum of the cavity opening of the underwater vehicle.

[0043] Embodiment 2:

[0044] The difference from the first embodiment is that the bending plate assembly 500 in this embodiment is a fixed structure, and its width is equal to the opening width. The rotation angle of the plate body 501 is 0°, and the curvature radius R of the plate body 501 is twice the height H1 of its active end. In the second embodiment, the bending plate assembly 500 adopts a fixed structure. This design simplifies the structure and installation process of the device and improves the stability and reliability of the device. At the same time, the rotation angle of the plate body 501 is 0°, that is, the plate body 501 remains parallel to the leading edge of the opening 400. This design can further reduce resistance and improve the fluid dynamics performance of the navigation body. In addition, the curvature radius R of the plate body 501 is twice the height H1 of its active end. This proportional design can ensure that the plate body 501 has the best fluid dynamics effect when guiding the shear layer vortex system.

[0045] When the incoming flow passes through the leading edge of the opening 400, the flow separation vortex moves obliquely upward, resulting in a reduction in the energy of the vortex that collides with the trailing edge of the cavity opening, thereby reducing the energy feedback caused by the collision between the vortex and the trailing edge of the opening 400, thereby achieving the purpose of reducing the peak energy of the shear oscillation line spectrum of the underwater cavity opening. In this embodiment, it is mainly suitable for underwater vehicles with faster speeds. Due to its faster speed, in order to avoid excessive resistance, the rotation angle of the plate body 501 is the smallest. When the speed of the underwater vehicle reaches its predetermined speed, the vortex is lifted up by the plate body 501, and its landing point is located at the rear side of the trailing edge of the opening 400, avoiding the energy feedback caused by the collision between the vortex and the trailing edge of the opening 400. In the second embodiment, due to the faster speed of the underwater vehicle, in order to avoid excessive resistance, the rotation angle of the plate body 501 is set to the minimum. This design can minimize resistance and improve the speed performance of the vehicle while ensuring the guiding effect. At the same time, when the speed of the underwater vehicle reaches a predetermined speed, the vortex system is lifted up by the plate 501 and falls behind the trailing edge of the opening 400, which avoids the collision between the vortex system and the trailing edge of the opening 400, thereby reducing energy feedback and shear oscillation line spectrum energy peak. This design helps to improve the stealth and stability of the vehicle and reduce the impact of noise and vibration on the performance of the vehicle.

[0046] Embodiment three:

[0047] What is different from the first embodiment is that in this embodiment, the bending plate assembly 500 is a fixed structure, and its width is equal to the opening width. The rotation angle of the plate body 501 is 30°, and the curvature radius R of the plate body 501 is 1.5 times the height H2 of its active end. In the third embodiment, the bending plate assembly 500 also adopts a fixed structure, which improves the stability and reliability of the device. The rotation angle of the plate body 501 is set to 30°, which is an optimized choice based on the principles of fluid mechanics. At the same time, the curvature radius R of the plate body 501 is 1.5 times the height H2 of its active end. This proportional design can ensure that the plate body 501 has the best fluid dynamics effect when guiding the shear layer vortex system.

[0048] When the incoming flow passes through the leading edge of the opening 400, the flow separation vortex moves obliquely upward, resulting in a reduction in the energy of the vortex that collides with the trailing edge of the cavity opening, thereby reducing the energy feedback caused by the collision between the vortex and the trailing edge of the opening 400, thereby achieving the purpose of reducing the peak energy of the shear oscillation line spectrum of the underwater cavity opening. In this embodiment, it is mainly suitable for underwater vehicles with slower speeds. Since its speed is slower, it is generally used for surveying. The outwardly extended plate 501 can improve its navigation stability. At the same time, the outwardly extended plate can also ensure that when the speed of the underwater vehicle reaches its predetermined speed, the vortex is lifted up under the action of the plate 501, and the landing point is located at the rear side of the trailing edge of the opening 400, avoiding the energy feedback caused by the collision between the vortex and the trailing edge of the opening 400.

[0049] In the third embodiment, since the speed of the underwater vehicle is relatively slow and it is mainly used for surveying and other tasks, the outwardly extended plate 501 can not only improve the stability of the vehicle, but also ensure that at a predetermined speed, the vortex system is lifted up by the plate 501 and falls behind the trailing edge of the opening 400. This design avoids the collision between the vortex system and the trailing edge of the opening 400, thereby reducing energy feedback and the peak energy of the shear oscillation line spectrum. At the same time, the outwardly extended plate also helps to reduce the impact of noise and vibration on the performance of the vehicle, and improve the stealth and stability of the vehicle.)

[0050] In general, Example 2 and Example 3 provide different plate design solutions for underwater vehicles with faster and slower speeds, respectively, to meet the performance optimization under different mission requirements. In Example 2, the angle and size of the adjustable plate are effectively dealt with the complex flow field problems generated during high-speed navigation, which not only improves the control stability of the vehicle, but also significantly reduces the noise and vibration caused by turbulence, which is crucial for underwater reconnaissance or combat missions that require fast and covert approach to the target. This solution demonstrates the ability to maximize the performance of the vehicle through sophisticated fluid dynamics design in a high-dynamic environment.

[0051] In the third embodiment, the outward extension plate design adopted is more focused on improving static stability and low-noise operation in response to the special needs of low-speed navigation bodies. This design not only enhances the stability of the navigation body when performing long-term survey tasks, but also effectively avoids the generation of fluid dynamic noise by carefully controlling the generation and shedding position of the vortex system, allowing the navigation body to operate in a more concealed state, which is of great significance to the fields of marine scientific research, underwater topographic mapping, etc.

[0052] In summary, whether it is a high-speed vehicle that pursues speed and concealment, or a low-speed vehicle that focuses on stability and low noise, the comprehensive performance of the underwater vehicle can be significantly improved through targeted board design. These innovative designs not only demonstrate the charm of the combination of fluid dynamics and engineering technology, but also open up a new direction for the development of underwater vehicles. In the future, with the continuous progress in fields such as materials science and computational fluid dynamics, the design of underwater vehicles will be more efficient and intelligent, and can better serve multiple fields such as ocean exploration and protection, national defense and security.

[0053] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A device for reducing the peak value of the shear oscillation line spectrum of the cavity opening of an underwater vehicle, characterized in that: include: A light shell having a plurality of openings formed on its surface; A curved plate assembly is connected to the edge of the opening facing the fluid, and includes a plate body, a fixed end and a height adjuster, wherein the fixed end is fixedly connected to the edge of the opening, the plate body is rotatably connected to the fixed end, and the height adjuster is connected between the lower end of the plate body and the inner side of the opening to adjust the height of the plate body.

2. The device for reducing the peak value of the shear oscillation line spectrum of the cavity opening of an underwater vehicle according to claim 1, characterized in that: The width of the plate body is not less than the width of the opening, and the rotation angle of the plate body is between 0 and 30 degrees, and the size of the rotation angle is inversely proportional to the moving speed of the navigation body.

3. The device for reducing the peak value of the shear oscillation line spectrum of the cavity opening of an underwater vehicle according to claim 1, characterized in that: The ratio of the curvature radius R of the plate body to the height H is 1:(1 / 2-2 / 3), and the curvature radius R of the plate body is 1 / 5-1 / 10 of the opening length.

4. The device for reducing the peak value of the shear oscillation line spectrum of the bore opening of an underwater vehicle according to claim 1, characterized in that: The opening is a rectangular structure or any shape, and the fixed end is flush with the horizontal plane of the leading edge of the opening.

5. The device for reducing the peak value of the shear oscillation line spectrum of the bore opening of an underwater vehicle according to claim 1, characterized in that: The driving mode of the height adjuster includes telescopic devices such as electric poles and hydraulic poles.

6. The device for reducing the peak value of the shear oscillation line spectrum of the bore opening of an underwater vehicle according to claim 1, characterized in that: It also includes a pressure hull, on the surface of which the light outer shell is connected via a plurality of vertically connected bulkheads.

7. The device for reducing the peak value of the shear oscillation line spectrum of the bore opening of an underwater vehicle according to claim 1, characterized in that: The bending plate assembly is a fixed structure, whose width is equal to the opening width, and the rotation angle of the plate body is 0 degrees. The curvature radius R of the plate body is twice the height H1 of its movable end, and is mainly suitable for underwater vehicles with faster speeds.

8. The device for reducing the peak value of the shear oscillation line spectrum of the bore opening of an underwater vehicle according to claim 7, characterized in that: When the speed of the underwater vehicle reaches a predetermined speed, the vortex is lifted up by the plate, and its landing point is located behind the trailing edge of the opening, thus avoiding energy feedback caused by the collision between the vortex and the trailing edge of the opening.

9. The device for reducing the peak value of the shear oscillation line spectrum of the bore opening of an underwater vehicle according to claim 1, characterized in that: The bending plate assembly is a fixed structure, whose width is equal to the opening width, and the rotation angle of the plate body is 30 degrees. The curvature radius R of the plate body is 1.5 times the height H2 of its movable end, and is mainly suitable for underwater vehicles with slower speeds.

10. The device for reducing the peak value of the shear oscillation line spectrum of the bore opening of an underwater vehicle according to claim 9, characterized in that: The outward extending plate can improve the stability of the navigation body, and at the same time ensure that when the speed of the underwater navigation body reaches a predetermined speed, the vortex system is lifted up under the action of the plate body and the landing point is located behind the trailing edge of the opening, avoiding energy feedback caused by the collision between the vortex system and the trailing edge of the opening.

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