旋转环形偏心圆截面弯管内流动特性分析  

Analysis of flow characteristics in rotating curved eccentric annular pipe

作　　者：麻剑锋[1] 沈新荣[1] 章本照[1] 陈华军[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）》2005年第11期1829-1832,共4页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(10272096)

摘　　要：采用贴体坐标系下的SIMPLE方法来求解旋转环形偏心圆截面弯管内流体流动的速度场.分析了偏心距和旋转对于二次流以及轴向速度分布的影响,同时给出了平均摩擦系数和壁面摩擦力的分布.结果表明,二次流和轴向速度的最大值总是趋向位于内、外壁面距离较大的一侧.在计算参数保持一致的条件下,在所研究的3种偏心距(0,0.2,-0.2)中,当偏心距为0.2时平均摩擦系数最小.当旋转从负到正连续变化时,平均摩擦系数和二次流强度存在临界点,临界点的数值依赖于偏心距.SIMPLE scheme based on boundary-fitted coordinate was adopted to solve the velocity fields in a rotating curved eccentric pipe. Effects of eccentricity and rotation on the secondary flow and maximal axial velocity were analyzed, and the average friction factors and the wall friction distributions were also presented. The results show that the maximal secondary-flow and axial velocity tend to locate in the region where the distance between the inner and outer wall is larger. On condition the computational parameters are the same, given three different eccentricity （0, 0.2,-0.2）, the average friction factor is the smallest when the eccentricity is 0.2. When rotation changes continuously from minus to positive, there exists a critical point in average friction factor and secondary-flow intensity. The exact values of the critical points depend on the eccentricity.

关 键 词：旋转环形偏心弯管 贴体坐标 二次流动 

分 类 号：O351[理学—流体力学]