三圆柱绕流的实验研究  

Experimental Research on Flow Around Three Circular Cylinders

作　　者：顾志福[1] 孙天风[1] 

机构地区：[1]北京大学,北京100871

出　　处：《空气动力学学报》2000年第4期441-447,共7页Acta Aerodynamica Sinica

基　　金：国家教委博士点基金资助项目

摘　　要：通过风洞实验研究了在亚临界雷诺数下成等边三角形布置的三个相同直径的二维圆柱在不同风向角下的表面压力分布的变化。研究结果表明 ,在较小间距比时 ,随风向角的变化会产生由邻近、剪切层和尾流三种不同机理引起的相互干扰。在一定的风向角下 ,由于上游柱分离剪切层的直接作用 ,处于下游位置圆柱的内侧或外侧会出现大面积的负压分布 ,因而产生很大的横向力。In this paper the time mean pressure distribution on three circular cylinders in different equilateral triangular arrangements were investigated by wind tunnel test at a subcritical Reynolds number of 5.5×10 4. Due to the interference of shear layers and/or wakes, the most complex features of pressure distributions can be found on the cylinder located in downstream. Three kinds of interference of proximity, shear layer and wake can be classified in small spacing ratio. Because of the interaction of the shear layer separated from upstream cylinder,at certain angle of attack, large area of suction may occur either on the outer or inner side surface of the downstream cylinder, and the significant lateral force results which is associated with some kinds of regular shear layer separating and/or vortex shedding.

关 键 词：旋涡脱落 亚临界雷诺数 三圆柱绕流 流体力学 

分 类 号：O354[理学—流体力学]