下倾管中段塞流液塞长度波动的非线性分析

利用非线性分析技术中的分形理论在较宽的流速范围内对下倾管中空气-水段塞流的液塞长度波动特性进行了研究.结果表明,下倾管中段塞流的液塞长度符合对数正态分布,其波动是对初始条件敏感的混沌振荡,且具有持久性.通过对不同液相折算速度下的液塞长度波动特性的分析发现,液相折算速度较大时,随着混合速度的增加,液塞长度波动的混沌程度增加;而液相折算速度较小时,随着混合速度的增加,液塞长度波动的混沌程度减小.管线下倾角越大,液塞长度波动的长程相关性越好.

A Fluctuation Analysis of Liquid Slug Lengths for the Slug Flow in Downward Inclined Pipe

The fluctuation characteristics of liquid slug length in the downward inclined pipe with a large range of gas and liquid velocities were investigated on the basis of fractional theory of air/water slug flow. The results indicate that the distribution of liquid slug lengths can consist with the log-normal distribution, and the fluctuation of liquid slug lengths is a chaotic vibration which is sensitively dependent on the initial conditions and has permanence properties. When the liquid superficial velocity is relative high, the chaos of liquid slug length fluctuation will increase with increasing of mixture velocity, however, when the liquid superficial velocity is relative low, with increasing of mixture velocity, the chaos of liquid slug length fluctuation will decrease. The larger the inclined angle of the tube is, the better the long-range correlation properties of the liquid slug length fluctuation are.