Control of flow past a circular cylinder by using active jets
In the present study,an active flow control scheme,which is characterized by suction from the windward side and wake jet from the leeward side of the circular cylinder was experimentally investigated to manipulate the wake vortex shedding,reduce the drag and suppress the lift.Apart from measuring surface pressure distributions to estimate the dynamic wind loads acting on the cylindrical test model,a particle image velocimetry(PIV)system was also employed to quantify the wake flow characteristics in order to assess the effectiveness of the proposed active control method.It was found that the active control implementation was very effective in manipulating the wake vortex shedding process from the circular cylinder,reducing drag and suppressing fluctuating amplitude of the dynamic wind loads acting on the test model.The wake flow structures measured by PIV system revealed that the wake jet would change the shedding modes of the wake vortex structures behind the cylindrical test model.Owing to the dynamic interactions between the jet flow and the shed wake vortex structures,the antisymmetric pattern of the vortex shedding was observed to convert to symmetric mode,which acted as the underlying mechanism of the active flow control.As a result,the periodical vortex shedding was attenuated and the fluctuaing lift forces acting on the cylindrical model were greatly suppressed.
Circular cylinder active control windward and leeward jets flow structures
Donglai Gao Wenli Chen Guanbin Chen Hui Li
School of Civil Engineering,Harbin Institute of Technology,Harbin,China
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
1098-1101
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）