不可视环境下用声音信号测定间歇频率的新方法

A Novel Method to Determine the Intermittent Frequency Using Sound Signal Analysis under Invisible Flow Conditions

针对不可视环境下的气液两相流动,开发了分析声音信号的方法,利用这两种流型下声音信号的特点来辅助辨识分层流流型和间歇流流型。由于声音信号采集频率高,对管内流体流动的变化更加敏感,故其不但能准确地反映出间歇流的周期波动特性,而且还能通过及时地捕捉由液塞通过时造成的声音信号的振幅变化来准确地确定间歇频率;此外,通过对声音信号的分析,分别得到了间歇频率随液体折算速度和气体折算速度的变化规律。

Aimed at the gas-liquid two-phase flow under the invisible environment,a novel method using sound signal analysis was developed to assist verifying the stratified flow and intermittent flow.Due to the higher acquisition frequency and more sensitive to the flow situations,it not only could accurately reflect the characteristics of periodic fluctuation of the intermittent flow,but also it was able to exactly measure the slug frequency by capturing the amplitude changes of the sound signal caused by the passing of the liquid slug.In addition,the influential profiles of the liquid superficial velocity and the gas superficial velocity on slug frequency are obtained,respectively.