旋转螺旋管道内粘性流动  

Flow in rotating helical pipe

作　　者：张金锁[1] 章本照[1] 鞠剑伟[1] 

机构地区：[1]浙江大学力学系,浙江杭州310027

出　　处：《水利学报》2001年第5期32-37,共6页Journal of Hydraulic Engineering

摘　　要：首先根据张量分析推导出旋转螺旋坐标系下流体的相对运动方程 ,采用摄动方法求解了圆截面旋转螺旋管道内的粘性流动 ,得到二阶摄动解 ;研究了在曲率、挠率和旋转共同作用下的流体运动的特性 ;结果表明 :旋转螺旋管道与不旋转螺旋管道内的二次流动以及轴向速度的分布存在明显的差别 ,在圆截面上最多可存在上下不对称的四个涡 ,轴向速度最大值所在的位置与挠率和科氏力 (Coriolisforce)与离心力 (Centrifugalforce)之比有关 .On the basis of tensor analysis technique,the relative N S equations in a rotating helical coordinate system are presented.The flow in a rotating helical pipe with small curvature and torsion is analyzed by pertubation method and a second order solution is obtained completely.The combined effects of curvature,torsion and rotation on characteristics of flow are studied in detail.The study indicates that there are obvious differences between the flow in a rotating helical pipe and in a helical pipe without rotation.Four flow loops may exist in the cirular cross section and the location of maximal axial velocity is related to the torsion and the ratio of the Coriolis force to centrifugal force.

关 键 词：螺旋管道 二次流动 摄动方法 张量分析 

分 类 号：TV134[水利工程—水力学及河流动力学]