垂直管空气-水两相流型的Shannon信息熵特性研究

利用信息论原理，研究两相流流型的Ｓｈａｎｎｏｎ信息熵特性。Ｓｈａｎｎｏｎ信息熵可由两相流系统的时间相关信号（如压差）的功率谱密度计算得到。在两相流实验台架上进行了垂直管两相流试验研究，通过调节空气和水的体积流量，获得不同流型工况下压差信号的实验数据。计算不同流型下的Ｓｈａｎｎｏｎ信息熵，发现泡状流的负Ｓｈａｎｎｏｎ信息熵（负熵）最小，弹状流的负熵最大，而环状流的负熵界于两者之间。

Shannon Entropy Characteristics of Air- Water Two Phase Flow Reg imes in Vertical Pipes

A method to research Shannon entropy characteristics of two- phase flow regimes is introduced in this paper.Shannon entropy can be calculated from power spectral density of output signal (such as pressure drop).In a test facility of two- phase flow loop,experiment was made to investigate two- phase flow regimes in vertical pipes.The experimental data of different flow regime tests were obtained by adjusting the air and water volume flow.From analyzing the Shannon entropy of different flow regimes,we find that the negative Shannon entropy (negentropy) of bubble flow is the smallest,slug flow's is the largest and the negentropy of annular flow is between that of bubble flow and annular flow.