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Underwater flow-induced cavity noise control device

A cavity noise and control device technology, applied in the direction of fluid flow, mechanical equipment, etc., can solve the problems of low self-noise, high applicability, etc., achieve flexible installation, stable cavity noise control effect, and reduce the effect of velocity gradient

Active Publication Date: 2020-05-08
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above two types of cavity noise control devices applied in the air can be used as a reference for the control of cavity noise in water, but there are still areas to be improved in terms of low self-noise, high applicability, and ease of installation and use.

Method used

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0029] Such as Figure 1 to Figure 4 As shown, an underwater flow-induced cavity noise control device includes a bracket 2, a drive unit 3 and a split body 1, wherein,

[0030] The bracket 2 is installed on the upper surface 5.4 of the cavity body 5, the upper surface 5.4 of the cavity body 5 has a cavity communicating with the inner cavity 5.5 of the cavity body 5, and the inside of the bracke...

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Abstract

The invention discloses an underwater flow-induced cavity noise control device. The underwater flow-induced cavity noise control device comprises a support, a driving unit and a flow dividing body, wherein the support is mounted on the upper surface of a cavity body, and the upper surface of the cavity body is provided with a cavity communicated with the inner cavity of the cavity body; the support is provided with the flow dividing body at a position corresponding to the cavity, the flow dividing body comprises a straight triangular prism and an extending shaft arranged on the straight triangular prism, and the extending shaft is arranged on at least one bottom surface; the three sides of the straight triangular prism are a flow dividing surface facing towards and facing the cavity, a back flow surface facing away from the cavity and a flow guiding surface connecting the flow dividing surface and the back flow surface; and the extending shaft is connected with the driving unit and isused for driving the straight triangular prism to rotate around the axis of the extending shaft. According to the underwater flow-induced cavity noise control device, on one hand, the boundary layer of the cavity is inhibited from being separated, on the other hand, the speed gradient of the shear layer of the cavity is reduced, the oscillation of the shear layer of the cavity is effectively inhibited, and the noise of the flowing cavity is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydrodynamic noise control, and more specifically relates to an underwater flow-induced cavity noise control device. Background technique [0002] Cavities widely exist in the openings of underwater vehicles. When the turbulent boundary layer on the surface of the vehicle flows through these openings, a turbulent shear layer is formed at the orifice (cavity opening). The interaction between the edge and the fluid in the cavity will form a relatively severe self-sustained oscillation at the mouth of the cavity, causing large velocity and pressure fluctuations, and radiating strong line spectrum noise, that is, cavity noise, which seriously affects the underwater vehicle. concealment. [0003] The mechanism of cavity noise is very complex. Generally speaking, typical cavity noise includes the following mechanism features: the turbulent boundary layer separates at the leading edge of the cavity and forms an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15D1/00
CPCF15D1/002F15D1/0055
Inventor 徐荣武章文文程果余文晶
Owner NAVAL UNIV OF ENG PLA
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