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Method for analyzing water-entry cavity characteristic of navigation body

A technology of water cavitation and analysis method, which is applied in fluid dynamics test, machine/structural component test, measuring device, etc., and can solve problems such as short design cycle

Inactive Publication Date: 2019-02-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved by the analysis method of the water-entry cavitation characteristics of the navigation body disclosed by the present invention is: to realize the numerical simulation of the cavitation flow of the water-entry body to reveal the flow law and mechanism of the water-entry cavitation of the navigation body, so as to provide a basis for the water-entry body cavitation flow. The structural design provides a theoretical basis, and can solve the practical application engineering problems of the water-entry vehicle, and the present invention has the advantages of high design efficiency, short design cycle, and practical application

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  • Method for analyzing water-entry cavity characteristic of navigation body
  • Method for analyzing water-entry cavity characteristic of navigation body
  • Method for analyzing water-entry cavity characteristic of navigation body

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Embodiment 1

[0063] Present embodiment takes the sphere disclosed abroad as research object, the sphere of straight d=0.0572m (and d as characteristic length), initial water entry velocity is v 0 =2.5m / s (put v 0 As the characteristic velocity), the initial rotational angular velocity is 210rad / s, the direction is counterclockwise, and the selected model is a billiard ball.

[0064] Such as figure 1 As shown, a method for analyzing the cavitation characteristics of a vehicle entering water disclosed in this embodiment includes the following steps:

[0065] Step 1: Carry out grid division for the fluid computational domain.

[0066] The geometric parameters of the water-entry vehicle are determined, and the entire watershed is meshed, and the entire watershed includes the water area and the air area. The Cartesian grid is adopted, and the principle of uniform distribution and normalization is adopted. The navigation body is selected as a sphere, and its diameter is used as a unit. The gr...

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Abstract

The invention discloses a method for analyzing the water-entry cavity characteristic of a navigation body and belongs to the field of fluid mechanical engineering. The method comprises a step of performing meshing and boundary condition setting on a whole drainage basin formed by water and air domains and applying a boundary data immersion method and a volume fraction method to an N-S equation, astep of realizing the simulation of an immersed object in multi-phase flow by introducing the boundary data immersion method, a step of realizing the tracking of a fluid interface by introducing the volume fraction method, and a step of solving the speed and pressure of the drainage basin by using a two-step projection method. According to the invention, the cavity flow numerical simulation of thewater-entry navigation body can be achieved to reveal the water-entry cavity flow law and mechanism of the navigation body, therefore, a theoretical basis is provided for the structural design of thewater-entry navigation body, the practical application engineering problem of the water-entry navigation body can be solved, and the method has the advantages of high design efficiency, short designperiod and the facilitation of practical application.

Description

technical field [0001] The invention belongs to the field of fluid mechanical engineering, and relates to an analysis method of water-entry cavitation characteristics of a navigation body, which is an analysis method of water-entry cavitation characteristics of a navigation body based on self-programming. Background technique [0002] The water entry problem of a vehicle involves the interaction of solid, liquid, and gas phases. The water entry process covers many physical problems such as cross-media, multiphase flow, strong turbulence, and compressibility. The problem of water entry of flying objects is a common natural phenomenon, so it has important applications in many engineering fields and scientific research, such as: water recovery of spacecraft, throwing of lifeboats, walking of aquatic animals, water diving by divers, etc. Early studies on the water entry problem mainly focused on the geometric parameters of the vehicle, the angle of entry into the water, and the ...

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Application Information

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IPC IPC(8): G01M10/00
CPCG01M10/00
Inventor 赵欣李达钦申屠吉赞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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