管道压力对界面扰动波演化影响分析

Influence of pipe pressure on the evolution of interfacial disturbance wave

本文针对界面扰动波的发展演化过程,利用液膜厚度测量传感器,在可调压中压湿气装置上进行了154组界面扰动波的测量实验,并运用递归定量分析方法提取液膜时序信号的确定性等4个特征参量,结合小波分析方法,对气液两相流界面扰动波的演化规律进行了研究,结果表明,在波状环状流中,随着管道压力的增加,界面扰动波的确定性值维持在1附近,递归熵值从4.5下降到3,表明界面波运动的有序性增强,比率值从1增加到2.5,而递归率值从0.5下降到0.3,表明扰动波由非稳态向稳态过渡;在完全环状流中,随着管道压力的增加,两相界面以规则的波纹波为主,界面波的确定性值从1下降到0.6,递归熵值从3下降到2,比率值从2.5突增到15,递归率值从0.3下降到0.1。

Aiming at the development and evolution of the interface disturbance wave,this article uses a liquid film thickness measurement sensor based on near-infrared absorption and attenuation technology to conduct 154 sets of interface disturbance wave measurement experiments on an adjustable and medium pressure wet gas test facility.And the methods of recursive quantitative analysis are utilized to extract four characteristic parameters of the liquid film time sequence signal including the certainty.The wavelet analysis is combined to study the evolution law of the disturbance wave at the gas-liquid two-phase flow interface.Results show that with the increase of pipe pressure,the deterministic value of interface disturbance wave remains around 1,and the recursive entropy value decreases from 4.5 to 3,which indicate that the order of interface wave motion is enhanced.The ratio value suddenly increases from 1 to 2.5,and the recursive ratio value decreases from 0.5 to 0.3,which indicate that the periodicity of disturbance wave is significantly enhanced,and the transition from unsteady state to steady state.In fully annular flow,with the increase of pipe pressure,the two-phase interface is dominated by regular ripple waves.The certainty value of the interface wave decreases from 1 to 0.6,the recursive entropy value decreasing from 3 to 2,the ratio value suddenly increases from 2.5 to 15,and the recursion rate value dropping from 0.3 to 0.1.