高雷诺数圆柱绕流分离的旋转控制  

Rotational control of flow separation for flow past a rotating cylinder at high Reynolds number

作　　者：何颖[1] 杨新民[1] 陈志华[1] 易文俊[1] 

机构地区：[1]南京理工大学瞬态物理重点实验室,南京210094

出　　处：《哈尔滨工程大学学报》2016年第8期1143-1150,共8页Journal of Harbin Engineering University

基　　金：总装预研基金项目(9140C3007081005)

摘　　要：为了深入研究高雷诺数旋转圆柱绕流的流场特性,采用大涡模拟(LES)方法对雷诺数Re分别为3 900、1.4×105、1.0×V106的圆柱绕流在不同转速条件下的三维流场进行了数值仿真。首先以典型非旋转圆柱绕流为算例与相关研究结果进行了对比,验证了本文计算方法与结果的准确性,然后对旋转速度α分别为1、2、3、4时的圆柱绕流进行了模拟。结果表明,不同雷诺数条件下旋转效应都可以有效抑制旋涡脱落和尾部湍流的产生,且分离涡随着转速和雷诺数的增大而变小。同时,雷诺数越小,圆柱的升阻比越大,而超临界区升阻力系数的变化趋势不明显且其值较小;雷诺数越大,受到粘性力的影响越小。To examine high-Reynolds-number flow field characteristics, we used large eddy simulation （ LES） to numerically simulate the flow past a rotating cylinder at Re = 3 900, 1.4 × 105, and 1.0×106. First, we used a typical flow past a non-rotating cylinder as an example for calculation, and compared the results with those from rel-evant research to verify the accuracy of our calculation method and results. Then, we simulated the flow past a cyl-inder with different spin ratiosαvarying from 0 to 4, respectively. The numerical results show that the rotation effect can effectively suppress vortex shedding and inhibit the generation of turbulent flows with different Reynolds num-bers, and that the separation vortex become smaller with increases in the rotational speed and Reynolds number. In addition, the smaller the Reynolds number, the greater the lift-drag ratio. Lastly, the drag and lift force values are small and the variation trend is not obvious in the supercritical region, and the effect of the viscous force becomes smaller when the Reynolds number is increased.

关 键 词：高雷诺数 大涡模拟 旋转圆柱 圆柱绕流 旋转控制 

分 类 号：TB126[理学—工程力学] V211[理学—力学]