Zuo Wei, Gu Yunsong, Cheng Keming, Liu Yuan. An experimental investigation on separation control of an airfoil by beveled-slit-synthetic-j et-actuator[J]. Journal of Experiments in Fluid Mechanics, 2014, (6): 45-50. DOI: 10.11729/syltlx20140063
Citation: Zuo Wei, Gu Yunsong, Cheng Keming, Liu Yuan. An experimental investigation on separation control of an airfoil by beveled-slit-synthetic-j et-actuator[J]. Journal of Experiments in Fluid Mechanics, 2014, (6): 45-50. DOI: 10.11729/syltlx20140063

An experimental investigation on separation control of an airfoil by beveled-slit-synthetic-j et-actuator

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  • Active flow control on a three-dimensional NACA633-421 airfoil has been investiga-ted experimentally using beveled-slit-synthetic-j et-actuator (BSSJA).Balance force measurement results show that the synthetic jet can control the flow separation effectively,improve the maxi-mum lift coefficient by 10.4% and increase the stall angle of attack by 4°.Both boundary layer velocity measurement and particle image velocimetry (PIV)technology have been performed un-der selected experimental conditions to investigate the mechanism of synthetic jet flow control. Results reveal that the shape factor of boundary layer velocity profile decreases with BSSJA con-trol and the promotion of the power of the boundary layer is responsible for the control effect. The instantaneous flow maps and ensemble-averaged PIV results reveal that synthetic j et tends to enhance the flow dilution and transfer the mass flux so that the separated flow could attach to the wall of NACA633-421 airfoil again.In addition,the turbulent kinetic energy (TKE)and Reyn-olds stress are increased near the wall compared to the situation without control.
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