Underwater vehicle body surface oscillation jet active flow control device and operation method

Abstract

The invention relates to an underwater vehicle body surface oscillation jet active flow control device and an operation method. The underwater vehicle body surface oscillation jet active flow control device comprises an oscillation jet generator array module embedded in the surface of an underwater vehicle deck, a pressure supply distribution module, a posture and flow state sensing module and a flow control execution module. The attitude and the surface flow state of the underwater vehicle are monitored in real time, the controller activates the oscillating jet device in a related specific area, oscillating jet flow with the adjustable emergence angle and frequency is generated, and flow separation on the surface of a boat body is effectively restrained and weakened. According to the device, extra control force can be generated on the premise that the appearance of the underwater vehicle is not changed, so that the low-speed maneuverability and the large-attack-angle control stability of the underwater vehicle are remarkably improved, meanwhile, the device has the advantages of noise reduction, high reliability and the like, and a new scheme is provided for enhancing the low-speed control performance of the underwater vehicle.

Description

Technical Field

[0001] This invention relates to the field of underwater vehicle design and flow control technology, and in particular to an active flow control device and operating method for an underwater vehicle surface oscillating jet. Background Technology

[0002] When underwater vehicles are maneuvering at low speeds, severe boundary layer separation occurs on the back side of the vehicle. The water velocity across the back surface of the vehicle is low, resulting in insufficient hydrodynamic force generated by the vehicle as a whole. This fails to provide sufficient force and torque, leading to decreased maneuverability, slow maneuver response, or even an uncontrollable state.

[0003] Existing technologies, based on research, primarily aim to reduce hydrodynamic noise through active flow control techniques such as fixed blowing / suction flows to suppress boundary layer flow separation. However, fixed blowing / suction flows suffer from low energy efficiency, high mass consumption of the suction / jet stream, and a narrow excitation frequency range, making them poorly adaptable to the complex separation vortex fields under underwater vehicle maneuvering conditions. No active flow control methods or devices utilizing surface oscillating jets to improve the maneuverability of underwater vehicles have been reported. Therefore, it is necessary to design a flow control device and method specifically for surface oscillating jets in underwater vehicles. Summary of the Invention

[0004] To address the shortcomings of existing production technologies, the applicant provides an active flow control device and operating method for surface oscillating jets in underwater vehicles. By arranging the surface oscillating jet flow control device in flow separation areas such as the deck side surface and conning tower of the underwater vehicle, the device suppresses the surface crossflow vortex structure, thereby significantly improving the low-speed maneuverability of the underwater vehicle and forming flow control over the surface separation vortices of the underwater vehicle under maneuvering conditions.

[0005] The technical solution adopted in this invention is as follows:

[0006] An active flow control device for oscillating jets on the surface of an underwater vehicle includes an oscillating jet generator array module, a pressure distribution module, an attitude and flow state sensing module, and a flow control execution module.

[0007] The oscillating jet generator array module is placed in the area of ​​the underwater vehicle where flow separation is likely to occur, and is used to generate oscillating jets with controllable frequency.

[0008] The pressure distribution module is used to provide a clean, stable, and high-pressure water flow to the oscillating jet generator array module;

[0009] The attitude and flow perception module is used to monitor the motion attitude and flow parameters of the underwater vehicle in real time, and generate flow control strategies and control commands.

[0010] After receiving the control command, the flow control execution module adjusts the operating parameters of the oscillating jet generator to perform oscillating jet control.

[0011] Its further technical solution lies in:

[0012] The oscillating jet generator array module is arranged on the side of the underwater vehicle deck, the conning tower, or the tail cone.

[0013] The oscillating jet generator in the oscillating jet generator array module is a fluid-type oscillating jet generator without moving parts.

[0014] The jet exit point of the oscillating jet generator is located upstream of the flow separation point, which is calculated by averaging the results of different operating conditions using CFD.

[0015] The operating parameters include the jet pressure, oscillation frequency, momentum coefficient, and duty cycle.

[0016] The pressure distribution module includes a water pretreatment device, a high-pressure seawater pump, and a pressure stabilizing tank connected in series. The output end of the pressure stabilizing tank is connected to multiple accumulators. Each accumulator is connected to the oscillating jet generator array module through a pipeline, and a distributor valve is installed on the pipeline.

[0017] The high-pressure seawater pump is a three-cylinder plunger pump.

[0018] The attitude and flow perception module includes attitude sensors, flow sensors, and a central controller mounted on the underwater vehicle.

[0019] A method for operating an active flow control device for surface oscillating jets of an underwater vehicle.

[0020] The following operational procedures are included:

[0021] Step 1: Sensing the macroscopic motion attitude and microscopic surface flow parameters of the underwater vehicle;

[0022] Step 2: Determine the flow separation state on the surface of the vehicle based on macroscopic motion attitude and surface flow parameters;

[0023] Step 3: When flow separation is detected, generate an oscillating jet flow control command;

[0024] Step 4: According to the flow control command, activate the oscillating jet generator array in the corresponding area and adjust the relevant jet parameters to suppress flow separation and generate the required underwater maneuvering force and torque.

[0025] The beneficial effects of this invention are as follows:

[0026] This invention features a compact and reasonable structure and is easy to operate. By arranging surface oscillating jet flow control devices in the flow separation areas such as the deck side surface and conning area of ​​the underwater vehicle, it suppresses the surface crossflow vortex structure, thereby significantly improving the low-speed maneuverability of the underwater vehicle and forming flow control over the surface separation vortices of the underwater vehicle under maneuvering conditions.

[0027] This invention can effectively improve the maneuverability of underwater vehicles. The oscillating jet can effectively suppress the complex flow separation on the deck during maneuvering conditions, and can generate greater lift on the surface of the vehicle at high angles of attack, thereby improving the low-speed maneuverability of the underwater vehicle.

[0028] In terms of stealth, this invention reduces mechanical noise due to the absence of external moving parts, and lowers hydrodynamic noise by suppressing flow separation.

[0029] In terms of energy efficiency, the oscillating jet is more energy efficient than the stable jet, and can be started and stopped on demand and controlled in zones, which greatly saves water flow mass consumption.

[0030] In terms of reliability, this invention offers advantages over traditional mechanical control surfaces due to the absence of moving parts in the fluidic oscillating jet array, resulting in lower maintenance requirements. It can serve as a backup system for traditional mechanical control surfaces, improving the overall maneuverability of underwater vehicles.

[0031] This invention significantly improves the low-speed maneuverability of underwater vehicles by using an oscillating jet system arranged on the surface of the vehicle to suppress the crossflow vortex structure on the surface. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the arrangement of the oscillating jet device of the present invention on an underwater vehicle (SUBOFF).

[0033] Figure 2 This is a schematic diagram of the SUBOFF backflow-side separation vortex for the oscillating jet control of the present invention.

[0034] Figure 3 This is a diagram showing the pressure distribution structure of the oscillating jet control system of the present invention.

[0035] Figure 4 This is a comparison diagram of the deck flow separation zone during SUBOFF non-oscillating jet control according to the present invention.

[0036] Figure 5 This is a comparison diagram of the deck flow separation zone when the SUBOFF of the present invention has oscillating jet control.

[0037] Figure 6 The image shows a comparison of the vortex structure for the SUBOFF non-oscillating jet control of this invention.

[0038] Figure 7Comparison diagrams of the vortex structure with oscillating jet control in the SUBOFF of this invention.

[0039] The components include: 1. Oscillating jet generator array module; 2. Water pretreatment device; 3. High-pressure seawater pump; 4. Pressure stabilizing tank; 5. Accumulator; 6. Pipeline; 7. Attitude sensor; 8. Flow sensor; 9. Central controller. Detailed Implementation

[0040] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0041] like Figures 1-7 As shown, the underwater vehicle surface oscillating jet active flow control device of this embodiment includes an oscillating jet generator array module 1, a pressure distribution module, an attitude and flow state sensing module, and a flow control execution module;

[0042] The oscillating jet generator array module 1 is arranged in the area of ​​the underwater vehicle where flow separation is likely to occur, and is used to generate oscillating jets with controllable frequency.

[0043] The pressure distribution module is used to provide a clean, stable, and high-pressure water flow to the oscillating jet generator array module 1;

[0044] The attitude and flow perception module is used to monitor the motion attitude and flow parameters of the underwater vehicle in real time, and to generate flow control strategies and control commands.

[0045] After receiving the control command, the flow control execution module adjusts the operating parameters of the oscillating jet generator to perform oscillating jet control.

[0046] The oscillating jet generator array module 1 is arranged on the side of the deck, the conning tower, or the tail cone of the underwater vehicle.

[0047] The oscillating jet generator in the oscillating jet generator array module 1 is a fluid-type oscillating jet generator without moving parts.

[0048] The jet exit point of the oscillating jet generator is located upstream of the flow separation point, which is calculated by averaging the results of different operating conditions using CFD.

[0049] The operating parameters include the jet pressure, oscillation frequency, momentum coefficient, and duty cycle.

[0050] The pressure distribution module includes a water pretreatment device 2, a high-pressure seawater pump 3, and a pressure stabilizing tank 4 connected in series. The output end of the pressure stabilizing tank 4 is connected to multiple accumulators 5. Each accumulator 5 is connected to the oscillating jet generator array module 1 through a pipeline 6. A distributor valve is installed on the pipeline 6.

[0051] The high-pressure seawater pump 3 uses a three-cylinder plunger pump.

[0052] The attitude and flow perception module includes an attitude sensor 7, a flow sensor 8, and a central controller 9, all mounted on the underwater vehicle.

[0053] The operation method of the underwater vehicle surface oscillating jet active flow control device in this embodiment.

[0054] The following operational procedures are included:

[0055] Step 1: Sensing the macroscopic motion attitude and microscopic surface flow parameters of the underwater vehicle;

[0056] Step 2: Determine the flow separation state on the surface of the vehicle based on macroscopic motion attitude and surface flow parameters;

[0057] Step 3: When flow separation is detected, generate an oscillating jet flow control command;

[0058] Step 4: According to the flow control command, activate the oscillating jet generator array in the corresponding area and adjust the relevant jet parameters to suppress flow separation and generate the required underwater maneuvering force and torque.

[0059] The flow state determination process is based on the comparison between the attitude angle sensor and the preset macroscopic attitude threshold, and the surface flow state parameter is the pressure change value.

[0060] The jet parameter adjustment adopts closed-loop control, with the motion state measurement value of the aircraft as the feedback signal.

[0061] The specific structure and function of the underwater vehicle surface oscillating jet active flow control device described in this embodiment are as follows:

[0062] It includes an oscillating jet generator array module 1, a pressure distribution module, an attitude and flow perception module, and a flow control execution module.

[0063] Among them, the oscillating jet generator array module 1:

[0064] The oscillating jet generator array module 1 is embedded in the deck surface of the underwater vehicle, as well as in areas prone to flow separation, such as the deck side surface and the conning area.

[0065] The oscillating jet generator is preferably a fluid-type oscillating jet generator without moving parts; the jet exit position of the oscillating jet generator is located upstream of the flow separation point, which is calculated by averaging the results of different operating conditions using CFD calculations; the jet exit angle (angle with the incoming flow direction) θ is -45° to 45°, and the jet exit velocity is greater than 1 times the incoming flow velocity; the jet orifice spacing is 3 times the transverse structural dimension of the oscillating jet generator. The operating pressure range of the jet generator is 0.1 to 30 MPa, and the excitation frequency range is 1 to 50 Hz.

[0066] Among them, the pressure distribution module:

[0067] The pressure distribution module includes a water pretreatment device 2, a high-pressure seawater pump 3, a pressure stabilizing tank 4, an accumulator 5, a distribution valve and pipelines 6, which are used to provide a stable and controllable high-pressure water flow to the oscillating jet generator.

[0068] The water pretreatment device 2 includes a multi-stage filter to remove impurities and silt, etc., to achieve the cleanliness required by the high-pressure seawater pump.

[0069] The high-pressure seawater pump 3 is a three-cylinder plunger pump (working pressure 0.1~30MPa), and its driving method is a hydraulic motor; the pressure stabilizing tank 4 mainly absorbs the pump's pulsation and outputs a stable high-pressure water flow; the high-pressure water flow inside the pipeline 6 is precisely delivered to one or more oscillating jet generator array modules 1 through the distribution control valve.

[0070] Among them, the attitude and flow perception module:

[0071] The attitude and flow perception module includes an attitude sensor 7, a flow sensor 8, and a central controller 9. The sensors monitor the vehicle's motion and flow conditions (angle of attack, surface flow, etc.) in real time. The central controller 9 generates flow control strategies based on the current macroscopic and microscopic flow field conditions.

[0072] Example of attitude and flow perception logic: When a drift angle greater than 10 degrees and a roll angle exceeding the limit are detected, or when a local pressure sensor detects a decrease in pressure and the presence of negative pressure, it is determined that flow separation is occurring or there is a risk of flow separation in the relevant area on the surface of the aircraft.

[0073] Among them, the flow control execution module:

[0074] After receiving the control command, the oscillating jet generator immediately activates the oscillating jet array on the surface area of ​​the vehicle, precisely controlling the opening and closing sequence of each distribution valve and the pressure and operating frequency of the oscillating jet generator, thereby exciting an oscillating jet of a specific frequency and energy, with an initial outflow velocity of 1.5 times the inflow velocity.

[0075] The flow control method generally includes the following steps.

[0076] Step 1: Attitude sensor 7 and flow sensor 8 sense the macroscopic attitude and microscopic flow parameters (pressure, shear stress) of the underwater vehicle in real time;

[0077] Step 2: The central controller 9 uses a built-in algorithm to sense whether the current fluid state is in the process of flow separation or is about to occur;

[0078] Step 3: If the flow separation state is determined, the controller outputs a control signal to the actuator (distribution valve, oscillating jet generator array) to activate the oscillating jet generator array module 1 in a specific area.

[0079] Step 4: The actuator adjusts the oscillation frequency, momentum coefficient and duty cycle of the jet to effectively inject energy into the boundary layer, accelerate the low momentum fluid in the separation zone, and delay or inhibit flow separation.

[0080] Step 5: The effect is to suppress flow separation, reduce the flow separation zone, optimize the pressure distribution on the surface of the underwater vehicle, and thus generate controllable enhanced hydrodynamics.

[0081] This embodiment can generate additional control force without changing the shape of the underwater vehicle, thereby significantly improving the low-speed maneuverability and high angle-of-attack control stability of the underwater vehicle. It also has the advantages of noise reduction and high reliability, providing a new solution for enhancing the low-speed handling performance of underwater vehicles.

[0082] The above description is an explanation of the present invention and not a limitation thereof. The scope of the present invention is defined by the claims. Within the scope of protection of the present invention, any form of modification may be made.

Claims

1. An active flow control device for oscillating jets on the surface of an underwater vehicle, characterized in that: It includes an oscillating jet generator array module (1), a pressure distribution module, an attitude and flow perception module, and a flow control execution module; The oscillating jet generator array module (1) is arranged in the area of ​​the underwater vehicle where flow separation is likely to occur, and is used to generate oscillating jets with controllable frequency. The pressure distribution module is used to provide a clean, stable, and high-pressure water flow to the oscillating jet generator array module (1); The attitude and flow perception module is used to monitor the motion attitude and flow parameters of the underwater vehicle in real time, and generate flow control strategies and control commands. After receiving the control command, the flow control execution module adjusts the operating parameters of the oscillating jet generator to perform oscillating jet control.

2. The active flow control device for oscillating jets on the surface of an underwater vehicle as described in claim 1, characterized in that: The oscillating jet generator array module (1) is arranged on the side of the deck, the conning tower, or the tail cone of the underwater vehicle.

3. The active flow control device for oscillating jets on the surface of an underwater vehicle as described in claim 1, characterized in that: The oscillating jet generator in the oscillating jet generator array module (1) is a fluid-type oscillating jet generator without moving parts.

4. The active flow control device for oscillating jets on the surface of an underwater vehicle as described in claim 3, characterized in that: The jet exit point of the oscillating jet generator is located upstream of the flow separation point, which is calculated by averaging the results of different operating conditions using CFD.

5. The active flow control device for oscillating jets on the surface of an underwater vehicle as described in claim 1, characterized in that: The operating parameters include the jet pressure, oscillation frequency, momentum coefficient, and duty cycle.

6. The active flow control device for oscillating jets on the surface of an underwater vehicle as described in claim 1, characterized in that: The pressure distribution module includes a water pretreatment device (2), a high-pressure seawater pump (3), and a pressure stabilizing tank (4) connected in series. The output end of the pressure stabilizing tank (4) is connected to multiple accumulators (5). Each accumulator (5) is connected to the oscillating jet generator array module (1) through a pipeline (6). A distributor valve is installed on the pipeline (6).

7. The active flow control device for oscillating jets on the surface of an underwater vehicle as described in claim 6, characterized in that: The high-pressure seawater pump (3) is a three-cylinder plunger pump.

8. The active flow control device for oscillating jets on the surface of an underwater vehicle as described in claim 1, characterized in that: The attitude and flow perception module includes an attitude sensor (7), a flow sensor (8), and a central controller (9) arranged on the underwater vehicle.

9. A method for operating the active flow control device for the surface oscillating jet of an underwater vehicle as described in claim 1, characterized in that: The following operational procedures are included: Step 1: Sensing the macroscopic motion attitude and microscopic surface flow parameters of the underwater vehicle; Step 2: Determine the flow separation state on the surface of the vehicle based on macroscopic motion attitude and surface flow parameters; Step 3: When flow separation is detected, generate an oscillating jet flow control command; Step 4: According to the flow control command, activate the oscillating jet generator array in the corresponding area and adjust the relevant jet parameters to suppress flow separation and generate the required underwater maneuvering force and torque.

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