实验流体力学2016，Vol.30Issue(4)：7-13,7.DOI:10.11729/syltlx20150112
雷诺数对圆柱气动力和流场影响的试验研究
Experimental study on Reynolds number effect on aerodynamic pressure and forces of cylinder
摘要
Abstract
By wind tunnel tests,Reynolds number effect on drag force coefficient,lift force coefficient and wind pressure coefficient of cylinder were measured, the mechanism of the aerodynamic force variation from the point of view of the flow field distribution was analyzed,and the correlation of the flow field in the cylinder axis direction under the Reynolds number effect was studied.Results show that in the subcritical Reynolds number regime,the time averaged flow field around the cylinder model is symmetric,the Reynolds number has little influence on the averaged drag force coefficient and flow field,and the averaged lift force is around zero.In the critical Reynolds number regime,with the appearance of large amplitude negative pressure in certain areas,flow field becomes asymmetric,and the averaged lift force as well as fluctuation lift force appears. In the supercritical Reynolds number regime, with the appearance of large amplitude negative pressure on the two sides,flow field becomes to symmetric again,and the averaged lift force disappears.Reynolds number has obvious effect on the flow field correlation along the cylinder axis.In the subcritical Reynolds number regime,the scale of the Karman vortex in the cylinder axis direction is relatively large,while the scale becomes small with the increase of Reynolds number.关键词
圆柱体/气动力/流场分布/雷诺数/轴向相关性Key words
cylinder/aerodynamic force/flow field distribution/Reynolds number/correlation in axis direction分类
交通工程引用本文复制引用
刘庆宽,邵奇,郑云飞,李聪辉,马文勇,刘小兵..雷诺数对圆柱气动力和流场影响的试验研究[J].实验流体力学,2016,30(4):7-13,7.基金项目
国家自然科学基金项目(51378323,51108280,51308359) （51378323,51108280,51308359）
河北省杰出青年科学基金(E2014210138) （E2014210138）
