Circulating water tunnel-based synchronous measuring system for unsteady cavitating flows

Abstract

The invention relates to a circulating water tunnel-based synchronous measuring system for unsteady cavitating flows and belongs to the technical field of marine and underwater vehicle engineering and hydraulic and hydro-power engineering. According to the connectional relation, a laser generator emits laser which is guided to an experimental model though a laser guide arm; the laser guide arm is connected in order with the laser generator and a computer mainframe case; a high-speed camera acquires an image which is transmitted to the computer mainframe case; a pressure sensor acquires a pressure strength signal which is transmitted to another computer through a signal conditioner and a data acquisition card; the top of an experimental segment is provided with transparent organic glass; a synchronous trigger switch controls the high-speed camera and the data acquisition card at the same time. The system has the advantages that various experimental measurement devices are enabled to synchronously observe and measure a cavitating flow field and finally, the unsteady cavitation process, which is complex multi-field coupling flow, is comprehensively researched on.

Description

technical field [0001] The invention relates to a multi-field synchronous measurement system for unsteady cavitation flow based on a circulating water tunnel, and belongs to the technical fields of ship and underwater vehicle engineering and water conservancy and hydropower engineering. Background technique [0002] In high-speed water flow, when the pressure at a certain location drops below the saturated vapor pressure, cavitation will occur. Cavitation flow is accompanied by complex unsteady flow characteristics such as cavity growth and collapse. Such phenomena will have many adverse effects on hydraulic machinery, such as surface material damage, vibration and noise, and power loss. [0003] In the past few decades, there have been many experimental studies on cavitation phenomena. The research equipment mainly includes high-speed camera technology, particle velocimetry technology PIV and laser Doppler velocimetry LDV laser-induced fluorescence LIF and micro sensors. T...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing single measurement equipment experimental method cannot simultaneously obtain the density field, motion field and pressure field of cavitation flow, and to provide a multi-field synchronous measurement system for unsteady cavitation flow based on circulating water tunnels

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