中南大学学报（自然科学版）Issue(1)：273-278,6.DOI:10.11817/j.issn.1672-7207.2016.01.037
矩形管道内低雷诺数圆柱绕流尾迹演化特性
Evolution of circular cylinder wake at low Reynolds number in rectangular channels
摘要
Abstract
To reveal the effect of confined channel walls on the evolution of circular cylinder wake, numerical simulations based on the finite volume method were conducted. The three-dimensional flow fields of circular cylinder wakes at Reynolds number 100 in rectangular channels were computed and analyzed. The influence of blockage and aspect ratios on the pressure distribution of the cylinder surface and in the wake was explored. The results show that the pressure coefficients at the front and the rear stagnation points are affected by the positions in spanwise direction, and the pressure coefficient at the rear stagnation point is associated with the vortex shedding state. The time-average pressure coefficients are influenced markedly by the channel’s end walls, and their values increase in the beginning and decrease afterward along the cylinder surface from the front to the rear stagnation point. The wake regime is the vortex street in the zone far from the end walls, whereas the wake becomes the twin vortices in the zone near to the end walls. The time-average pressure coefficients of cylinder surface at identical positions basically increase with the increase of blockage ratios, but decrease with the increase of aspect ratios.关键词
圆柱绕流/尾迹演化/矩形管道/雷诺数Key words
flow around circular cylinder/wake evolution/rectangular channel/Reynolds number分类
数理科学引用本文复制引用
董振营,周本钊,孙志强,蒋赟,周天..矩形管道内低雷诺数圆柱绕流尾迹演化特性[J].中南大学学报（自然科学版）,2016,(1):273-278,6.基金项目
国家自然科学基金资助项目(51006125)；中南大学教师研究基金资助项目(2013JSJJ018)(Project(51006125) supported by the National Natural Science Foundation of China （51006125）
Project(2013JSJJ018) supported by the Teachers Research Foundation of Central South University) （2013JSJJ018）
