环形截面小曲率弯管内粘性流动的摄动解  

perturbation solution of the flow in curved annular pipe with small curvature

作　　者：章本照[1] 张金锁[1] 陈华军[1] 常华章[1] 

机构地区：[1]浙江大学力学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2001年第3期342-346,共5页Journal of Zhejiang University：Engineering Science

摘　　要：以曲率为小参数 ,采用摄动方法求解了小曲率环形截面弯管内的粘性流动 ,得到该问题的二阶摄动解 ,研究了 Dean数和环形截面内外径之比对二次流动和轴向主流速度的影响 .结果表明 :环形截面上的二次流动和主流速度的分布不仅受 Dean数的影响 。The fully developed laminar flow in curved annular duct is analyzed by perturbation method. A second order perturbation solution is obtained. The secondary flow and the axial velocity are discussed in detail. The study indicates that there are four vortices in the annular cross-section and these vortices are affected not only by the \%De\% number but also the radius ratio. As \%De\% number increases, the maximum of the axial velocity and the centers of the vortexes near the inner circle is pushed to the outer side bend. The intensity of the vortex near the inner circle becomes stronger as the inner radius increases.

关 键 词：曲线管道 二次流动 摄动解 

分 类 号：O351[理学—流体力学]