摘要
为了改进标准方柱(直边尖角柱)的气动性能,以经过角(尖角、圆角)、边(直边、凹边和凸边)形状修正的类方柱为研究对象,采用非定常数值模拟方法,在低雷诺数下研究了6类二维柱体在不同风向角下的气动性能和流场特性。研究结果表明:对标准方柱的角、边形状的修正可明显改变其绕流场结构,会改善或劣化其气动性能;与直边柱体相比,凸边柱体的气动力系数和风压系数明显减小,而凹边柱体的气动力系数和风压系数均有增大的趋势;与尖角柱体相比,圆角化后柱体的气动力系数在所有风向角下呈整体下降趋势,Strouhal数增大;从总体上看,在研究的6类柱体中,凸边圆角柱的气动性能最好,凹边尖角柱的气动性能最差。
In order to improve the aerodynamic performance of the standard square cylinder with sharp corners and straight edges,taking analogous square cylinder modified by the shape of angle( sharp angle,fillet) and edge( straight edge,concave edge and convex edge) as research objects,the aerodynamic performance and flow field characteristics of six kinds of two-dimensional cylinders with different wind direction angles were studied under low Reynolds number by using unsteady numerical simulation method. Research results show that the modification of the angle and edge shape of the standard square cylinder can obviously change the flow field structure and improve or degrade its aerodynamic performance. Compared with the straight edge cylinder,the aerodynamic coefficient and the wind pressure coefficient of the convex edge cylinder decrease obviously,while those of the concave edge cylinder intend to increase. Compared with the sharp corner cylinder,the aerodynamic coefficient of the rounded cylinder shows a trend to decrease in all wind direction angles,and the Strouhal number increases. On the whole,among the six types of cylinder studied,the aerodynamic performance of the convex edge cylinder with rounded corners is the best,and that of the concave edge cylinder with sharp corners is the worst.
作者
杜晓庆
刘延泰
施定军
马文勇
DU Xiaoqing;LIU Yantai;SHI Dingjun;MA Wenyong(Department of Civil Engineering,Shanghai University,Shanghai 200444,China;Wind Engineering and Aerodynamic Flow Control Research Center,Shanghai University,Shanghai 200444,China;Wind Engineering Research Center,Shijiazhuang Tiedao University,Shijiazhuang 050043,Hebei,China)
出处
《重庆交通大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第5期49-57,共9页
Journal of Chongqing Jiaotong University(Natural Science)
基金
国家自然科学基金资助项目(51578330)
河北省自然科学基金项目(E2017210107)。
关键词
桥梁工程
方柱绕流
数值模拟
气动控制
气动性能
流场结构
bridge engineering
flow around square cylinder
numerical simulation
aerodynamic control
aerodynamic characteristic
flow field structure
