泥沙对水流紊动影响的进一步分析  

Further analysis of the effect of particles on flow turbulence

作　　者：刘青泉[1] 陈立[2] 

机构地区：[1]中国科学院力学所 [2]武汉水利电力大学河流工程系

出　　处：《水利学报》1997年第9期77-82,共6页Journal of Hydraulic Engineering

基　　金：国家自然科学基金

摘　　要：泥沙颗粒对水流紊动的影响是水沙两相流运动的重要问题之一．本文针对这一问题，从水流紊动的起因出发，分析了泥沙影响水流紊动的基本途径和方式．结合实验资料，主要对含沙量和泥沙粒径影响水流紊动强度的机理进行了探讨．从不出现尾涡脱落和至少能响应一部分大尺度涡的运动的基本条件出发，得到了泥沙颗粒抑制或增强紊动的判别条件．并得出结论：因含有沙粒，水流紊动存在着被削弱、增强、或局部削弱、局部增强３种情况，表明在不同的具体条件下，分散颗粒对混合体系紊动强度可以有不同的作用．The influeace of the sediment particles to the flow turbulence is an important problem of the water sand two phase flow. The paper reveals that the ways by which such influence originated could be devided into two catalogues: to change the inner flow stability or to change the outer disturbance source. Particles of different diameter or concentration may cause opposite consequence in the change of turbulent intensity. Based on the experimental data and two phase theory, a criterion whether particles would strengthen or damp turbulent intensity has been obtained. It has been concluded that particles in the flow under different conditions may result in three different consequences: increase, decrease and partial increase (with partial decrease) of the turbulent intensity.

关 键 词：泥沙颗粒 水流紊动 泥沙运动 河流动力学 

分 类 号：TV143.1[水利工程—水力学及河流动力学]