Experimental Study on Sweeping Jet Control of Flow around a Square Cylinder
In order to study the flow control effect of sweeping jet around the square cylinder,the flow field around the square cylinder controlled by the sweeping jet arranged at the front and rear stagnation points under different momentum coefficients was measured by particle image velocimetry(PIV).And the proper orthogonal decomposition(POD)was used to analyze the measured flow field.The results show that the interactions of the sweeping jet and the flow field are different under the two arrangements,but both arrangements can control the flow field around the square cylinder effectively,which have an op-timal momentum coefficient that achieves the best control effect.When the momentum coefficient of sweeping jets at the front stagnation point is 0.309,the shape of the flow field downstream of the square cylinder changes significantly,the wake vortex length,the turbulent kinetic energy and Reynolds shear stress decrease by about 50％,71％and 62％,respectively.POD modes show that the wake vortices shed downstream antisymmetrically.When the momentum coefficient of sweeping jets at the rear stagna-tion point is 0.174,the wake vortices are basically eliminated,and the turbulent kinetic energy and the Reynolds shear stress of the wake flow field are reduced by 32％and 67％.POD modes show that the wake vortices change to shed downstream symmetrically.
flow around square cylinderflow controlPIV measurementsweeping jetproper orthogo-nal decomposition(POD)
万方数据
维普
