低浓度固液两相流中泥沙对紊动水流结构的影响  

Coupling mechanism of turbulence and suspended sediment

作　　者：倪晋仁[1] 廖谦 周东火 

机构地区：[1]北京大学城市与环境学系 [2]美国KEANE有限公司

出　　处：《水利学报》1999年第6期1-5,共5页Journal of Hydraulic Engineering

基　　金：国家杰出青年科学基金

摘　　要：引入摄动分析的理论，尝试定量地描述紊动水流和悬移质泥沙之间的相互作用．应用悬移质泥沙浓度垂线分布公式［１］，分析由此产生的附加雷诺应力，得出了被摄动的速度分布，统一了现有挟沙水流速度分布的两种模式，与文献［２］中已经过验证的速度分布规律十分吻合．用这种分析方法得到的结果是对文献［２］中结果的理论解释，它不仅有助于我们理解低浓度固液两相流流动的复杂机理，而且为进一步的分析和研究提供了一个有益的框架和思路．Based on the perturbation theory,the interaction between turbulent water and suspended sediment is described quantitatively.The formula of the vertical distribution of sediment concentration is applied to the analysis of additional Reynolds stress and the distribution of perturbation velocity is obtained.As a result,the mean velocity profile is reported,which is almost the same as that proposed and verified by Ni & Hui(1998).The analysis demonstrates that the interaction and coupling of the phases is in a systematic manner.It provides the basis for the study on the effect of suspension on the mean velocity distribution and helps improving the understanding of the complicated mechanism of low concentration solid liquid two phase flow.

关 键 词：固液两相流 紊动水流 泥沙 

分 类 号：TV143.1[水利工程—水力学及河流动力学]