基于小波分析的垂直上升管气液两相流流型的识别

气液两相流的流型对其流动和传热特性有很大影响，所以如何确定流型一直是两相流研究中的重要课题。但是, 由于两相流介质之间存在着随机多变的相界面，致使两相流的流型不仅是多种多样，而且其变化也带有随机性，这给流型识别带来了很大困难。该文提出了利用压差波动信号的Lipschitz指数来识别流型的方法。采用小波分析中Lipschitz指数可描述不同流型的压差波动特征，因此，根据计算得到的Lipschitz指数的大小，可以识别出泡状流、间歇流和环状流。

Wavelet Analysis of Distinguish Flow Pattern in Vertical Upward Gas-liquid Two-Phase Flow

Flow and heat transfer characteristics of gas-liquid two-phase flow are strongly affected by its flow pattern.Therefore,the study on flow pattern is always an important subject of two-phase flow.however,as existing multifarious interphase boundary among the medium of two-phase flow,it leads to various of two-phase flow pattern,and the changes are random.so it is difficult to identify the flow pattern.This paper put forward a method to make use of Lipschitz exponent of differential pressure fluctuation signals to distinguish fiow pattern.It is found that the flow patterns,including intermittent flow,bubble flow and annular flow can be clearly identified in accordance with their Lipschitz exponent of differential pressure signals.