异重流孔口出流极限吸出高度分析  

Analysis on parameters of limiting height of aspiration for density current outflow from orifice

作　　者：范家骅[1] 

机构地区：[1]中国水利水电科学研究院泥沙研究所,北京100044

出　　处：《水利学报》2007年第4期460-467,共8页Journal of Hydraulic Engineering

摘　　要：通过对60年来盐水异重流孔口出流的试验和理论分析成果的综述与分析,讨论了孔口前异重流泄出层厚度参数的定义,论述了极限吸出高度与泄出层厚度的研究成果,以及孔口出流浓度与孔口出流参数的关系。提出了一个极限吸出高度的无量纲数。分析已有的试验成果发现,大部分二元和三元孔口出流试验的极限吸出高度参数接近某一定值。故在已知异重流浓度和出流流量时,即可估计出孔口出流极限吸出高度和泄出层厚度等值。A review of the theoretical analyses and relevant experimental results of saline density current discharged from orifices are presented. The findings of limiting height of aspiration and density current withdrawal thickness as well as the relationship between outflow concentration and hydraulic parameters of outflow are analyzed. A dimensionless parameter expressing the limiting height of aspiration is suggested. It is found that this dimensionless parameter is approximately equal to a constant including the experiments of 2-D and 3-D outflow. Therefore, the limiting height of aspiration and density current thickness can be estimated if the concentration and the outflow discharge are given.

关 键 词：异重流 孔口出流 选择性取水 盐水异重流 极限吸出高度 

分 类 号：TV145[水利工程—水力学及河流动力学]