垂直管道低温汽液两相流流型识别的实验研究

采用直接可视化方法和压力信号的功率谱密度分析方法对低温垂直管道中液氮-汽两相流的流型判别进行了实验研究.通过采集实验管路上不同位置处的压力信号,对其进行功率谱密度分析,并由此推断两相流的流型,同时与高速摄像机拍摄的流型进行对比.结果表明,在常温汽液两相流流型识别中应用的功率谱密度分析方法也可用于低温两相流的流型判别.通过改变热流密度发现,对于不同的热流密度工况,都可以使用功率谱密度分析方法判断管内低温两相流的流型.

Study on Flow Regime Identification of Cryogenic Vapor Liquid Two Phase Flows in Vertical Pipes

Visualization experiments and the PSD of pressure signal were used to identify cryogenic vapor liquid two phase flows regime in vertical pipes. The flow regime got from high speed camera and one inferred according to the PSD of pressure signal of different location were compared. It is found that PSD which is usually used to identify room temperature two phase regime can also be used to identify cryogenic two phase flow regime; even in different heat flux, it all works.