湖南大学学报（自然科学版）Issue(5)：65-71,7.
均匀流中悬臂圆柱体气动力雷诺数效应∗
Reynolds Number Effects on the Aerodynamic Forces of a Cantilevered Circular Cylinder in Uniform Flow
摘要
Abstract
The aerodynamic forces on a cantilevered circular cylinder with an aspect ratio of 5 were ex-perimentally investigated in a wind tunnel.The diameter of the cylinder d was 200 mm.The oncoming flow velocity ranged from 5 m/s to 45 m/s,corresponding to Reynolds number of 0.68×10 5 ~6.12×10 5 , which covered subcritical,critical and transcritical regimes.It was found that,although the cantilevered cylinder is in uniform flow,its aerodynamic forces present significant differences at various spanwise posi-tions,indicating a strong three dimensionality.Reynolds number has profound effect on the aerodynamic forces on the cantilevered cylinder.The critical Reynolds number is smaller for the cantilevered cylinder relative to that of 2D cylinder.In the critical regime,reduction in the drag coefficient (C d )of the cantile-vered cylinder is relatively smaller compared with that of 2D cylinder.In subcritical regime,C d of the can-tilevered cylinder is smaller than that of 2D cylinder.On the other hand,C d of the former is larger in tran-scritical regime.The critical Reynolds number is different at various spanwise locations for the cantilevered cylinder.Transition from subcritical to critical regimes occurs earlier near the free end of the cantilevered cylinder.关键词
钝体绕流/悬臂圆柱/气动力/雷诺数效应Key words
flow around bluff body/cantilevered circular cylinder/aerodynamic forces/Reynolds number effects分类
建筑与水利引用本文复制引用
王汉封,邹超,王启文,何旭辉..均匀流中悬臂圆柱体气动力雷诺数效应∗[J].湖南大学学报（自然科学版）,2015,(5):65-71,7.基金项目
国家自然科学基金资助项目(51108468,11472312),National Natural Science Foundation of China(51108468,11472312) （51108468,11472312）
