Control of mean and fluctuating forces on a circular cylinder at high Reynolds numbers  

作　　者：Chuanping Shao Jianming Wang 

机构地区：[1]Institute of Mechanics, Chinese Academy of Sciences.Beijing 100080, China [2]State Key Laboratory for Turbulence and Complex System,Peking University, Beijing 100871, China

出　　处：《Acta Mechanica Sinica》2007年第2期133-143,共11页力学学报（英文版）

基　　金：the National Natural Science Foundation of China(10172087 and 10472124).

摘　　要：A narrow strip is used to control mean and fluctuating forces on a circular cylinder at Reynolds numbers from 2.0 ×10^4 to 1.0 ×^ 10^5. The axes of the strip and cylinder are parallel. The control parameters are strip width ratio and strip position characterized by angle of attack and distance from the cylinder. Wind tunnel tests show that the vortex shedding from both sides of the cylinder can be suppressed, and mean drag and fluctuating lift on the cylinder can be reduced if the strip is installed in an effective zone downstream of the cylinder. A phenomenon of mono-side vortex shedding is found. The strip-induced local changes of velocity profiles in the near wake of the cylinder are measured, and the relation between base suction and peak value in the power spectrum of fluctuating lift is studied. The control mechanism is then discussed from different points of view.A narrow strip is used to control mean and fluctuating forces on a circular cylinder at Reynolds numbers from 2.0 ×10^4 to 1.0 ×^ 10^5. The axes of the strip and cylinder are parallel. The control parameters are strip width ratio and strip position characterized by angle of attack and distance from the cylinder. Wind tunnel tests show that the vortex shedding from both sides of the cylinder can be suppressed, and mean drag and fluctuating lift on the cylinder can be reduced if the strip is installed in an effective zone downstream of the cylinder. A phenomenon of mono-side vortex shedding is found. The strip-induced local changes of velocity profiles in the near wake of the cylinder are measured, and the relation between base suction and peak value in the power spectrum of fluctuating lift is studied. The control mechanism is then discussed from different points of view.

关 键 词：Control .Vortex shedding .Circular cylinder .Mean and fluctuating forces High Reynolds number 

分 类 号：O357[理学—流体力学]