不同深宽比矩形腔双壁反向驱动蠕流涡结构研究  

Vortex Structure of Creeping Flow in a Rectangular Cavity with Two Opposite Moving Walls and Different Aspect Ratios

作　　者：何士华[1,2] 张立翔[2] 徐天茂[2,3] 武亮[1,2] 

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500 [2]昆明理工大学建筑工程学院,云南昆明650500 [3]昆明理工大学计算中心,云南昆明650500

出　　处：《昆明理工大学学报（自然科学版）》2012年第3期85-90,共6页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金资助项目(项目编号:51149013);云南省自然科学基金资助项目(项目编号:2007A030M)

摘　　要：研究了不同深宽比二维矩形腔双壁反向驱动流的流动结构.采用微分求积法计算分析了深宽比从0.15到6.6变化对矩形腔蠕流涡结构的影响,给出了涡演化过程中的临界深宽比、流型及其分岔图.当深宽比在0.15至0.7之间变化时,腔内涡结构沿横向分布并随深宽比增加子涡逐步合并;当深宽比大于0.7时,随着深宽比增大,腔内流动结构沿纵向展开并且漩涡数量逐渐增多,具有周期性和自相似的变化特征,外围大涡的形成来源于中间区域新涡的生成和演化;在不同的深宽比条件下,腔内流动始终呈现对称的涡结构流型.The flow configuration of the two-dimensional creeping flow in a rectangular cavity with two opposite moving walls and different depth-to-width ratios is investigated. The effects of aspect ratio varying from 0. 15 to 6.6 on vortex structure of the creeping flow in cavity were numerated using the Differential Quadrature method. The critical aspect ratios, streamline patterns and bifurcation diagrams were presented. As aspect ratio increases from 0. 15 to 0. 7, the vortex structure distributes in the transverse direction of cavity and the sub - eddy centers gradually merge. When the aspect ratio is larger than 0. 7, the flow structure unfolds in tile longitudinal direction of cavity and the number of vortices gradually increases with the aspect ratio increasing. The evolution of flow pattern exhibits the characteristics of periodicity and self - similarity. The large outer vortices evolve from the growth of new vortices in the middle region of cavity. The flow patterns are always syrr,metric about the cavity centre at different aspect ratios.

关 键 词：矩形腔驱动流 涡结构 蠕流 深宽比 

分 类 号：TB126[理学—工程力学]