Flow control method for inhibiting surface cavitation phenomenons of underwater vehicle and hydrofoil

Abstract

The invention discloses a flow control method for inhibiting surface cavitation phenomenons of an underwater vehicle and a hydrofoil. The method comprises the steps that porous medium materials are adopted and fixed to the local or total fixing wall surface of the underwater vehicle or the hydrofoil, and the specific fixing position is one of the following situations: A, the porous medium materials are fixed to the upstream region of the primary cavitation position of the fixing wall surface of the underwater vehicle or the hydrofoil; B, the porous medium materials are fixed to the neighborhood of the primary cavitation position of the fixing wall surface of the underwater vehicle or the hydrofoil; C, the porous medium materials are fixed to the corresponding cavitation region of the fixing wall surface of the underwater vehicle or the hydrofoil; D, the porous medium materials are fixed to the corresponding cavitation tail portion and the neighborhood region of the fixing wall surface of the underwater vehicle or the hydrofoil; E, the porous medium materials are fixed to the corresponding cavitation tail downstream region of the fixing wall surface of the underwater vehicle or the hydrofoil. According to the flow control method, the cavitation flow phenomenons of the porous medium neighborhood even the fixing wall surface of the whole underwater vehicle or the hydrofoil are effectively inhibited.

Description

technical field [0001] The invention relates to a flow control method for suppressing cavitation, in particular to a flow control method for suppressing the cavitation phenomenon on the surface of an underwater vehicle and a hydrofoil. Background technique [0002] In order to control the cavitation phenomenon on the surface of the vehicle or hydrofoil to achieve the purpose of improving the hydrodynamic characteristics of the vehicle, improving its structural reliability and reducing flow noise, the existing cavitation suppression technologies mainly include: hydrodynamic shape optimization, local roughness Surfaces, barrier strip structures and jets. The above cavitation suppression technologies all have certain problems: [0003] 1. Although the hydrodynamic shape optimization method can reduce or even eliminate the cavitation phenomenon at a certain sailing speed, in the actual sailing process, due to attitude changes or a slight increase in speed, cavitation will occur...

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Problems solved by technology

[0003] 1. Although the hydrodynamic shape optimization method can reduce or even eliminate the cavitation phenomenon at a certain sailing speed, in the actual sailing process, due to attitude changes or a slight increase in speed, cavitation will occur on the surface of the sailing body or hydrofoil. A local low-pressure cavitation area or even a large-scale cavitation area appears;

[0004] 2. The use of the isolation strip structure is mainly used to control the retroreflection and shedding of the cavitation, and the control effect on the incipient cavitation phenomenon is limited, and because the above isolation strip structure often protrudes from the surface of the vehicle or hydrofoil locally, thus There will be some additional resistance;

[0005] 3. The local groove structure will weaken the strength of the shell. In order to ensure its safety, the shell needs to be thickened, thereby increasing its weight, and because the groove structure can only adapt to specific flow conditions, when the sailing conditions change When , it is difficult to effectively suppress the cavitation phenomenon;

[0006] 4. Jet technology requires a drive system, including motors, pumps, and pipeline structures. The system is relatively complex

For example, when the local pressure is too high due to the retroreflection of the water flow at the tail of the cavitation on the surface of the vehicle or hydrofoil, local cavitation and material peeling will occur, especially when the size of the cavitation is large, the impact of the retrojet flow will even cause serious damage. structural deformation and damage

The cavitation phenomenon on the surface of the vehicle and its hydrofoil will also significantly reduce its hydrodynamic force and steering moment, thus affecting the attitude stability of the vehicle

In addition, due to the unsteady development of the cavitation, especially the unsteady shedding of the cavitation cluster and the vortex structure at the tail of the cavitation, large pressure fluctuations will appear on the surface of the vehicle and the flow field around it, resulting in flow noise. Weakened its acoustic performance

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