悬浮泥沙对粗糙底壁湍流场猝发的影响  

作　　者：周泽宣[1] 林建忠[1] 王玉芝[1] 

机构地区：[1]浙江大学力学系

出　　处：《水利学报》1997年第4期49-55,共7页Journal of Hydraulic Engineering

基　　金：浙江省自然科学基金

摘　　要：本文建立了具有法向压力梯度项和沙粒作用项的粗糙底壁附近流场的运动方程，结合对粘性底层和过渡区内层交界面的分析方法和小扰动稳定性理论，由理论分析和数值计算得到了流动雷诺数、无量纲扰动波数、无量纲两相法向平均速度差、斯托克斯数、壁面的粗糙元以及悬浮沙粒的质量浓度等因素与水流底壁湍流猝发角乃至猝发难易程度的关系，部分结果与已有的实验结果进行了比较．文中所得结论有助于进一步了解挟沙水流近壁流场和悬浮泥沙的运动特性以及泥沙的沉积和输运机理．The equations of boundary layer is deduced by applying the analytical method to the analysis on interface between viscous sublayer and inner region of the buffer region near the wall. By keeping the normal pressure gradient term in the equation, the effect of suspended sands on water flow is considered. The small perturbation stability theory is applied to study the turbulence burst of water flow with rough wall. Some important conclusions have been drawn from variations of the burst angle caused by Reynolds number, the difference between suspended sand normal nondimensionalized mean velocity and water mean velocity, Stokes number, wall roughness and sand loading.

关 键 词：粗糙底壁 数值计算 悬浮泥沙 湍流场猝发 

分 类 号：TV142.1[水利工程—水力学及河流动力学]