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Zhao Guoqing, Zhao Qijun, Gu Yunsong, Chen Xi, Zhang Dongyu, Zuo Wei. EXPERIMENTAL INVESTIGATION OF SYNTHETIC JET CONTROL ON LARGE FLOW SEPARATION OF AIRFOIL DURING STALL[J]. Chinese Journal of Theoretical and Applied Mechanics, 2015, 47(2): 351-355. DOI: 10.6052/0459-1879-14-134
Citation: Zhao Guoqing, Zhao Qijun, Gu Yunsong, Chen Xi, Zhang Dongyu, Zuo Wei. EXPERIMENTAL INVESTIGATION OF SYNTHETIC JET CONTROL ON LARGE FLOW SEPARATION OF AIRFOIL DURING STALL[J]. Chinese Journal of Theoretical and Applied Mechanics, 2015, 47(2): 351-355. DOI: 10.6052/0459-1879-14-134
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EXPERIMENTAL INVESTIGATION OF SYNTHETIC JET CONTROL ON LARGE FLOW SEPARATION OF AIRFOIL DURING STALL

  • 1.

    National Key Laboratory of Science and Technology on Rotorcraft Aeromechanics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

  • 2. Department of Aerodynamics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Funds: The project was supported by the National Natural Science Foundation of China (11272150) and the PAPD.
  • Received Date: May 08, 2014
  • Revised Date: December 24, 2014
    Graphical Abstract
    • Abstract
  • In order to investigate the active flow control effect of synthetic jet on preventing flow separation and delaying stall of airfoil at low speed, wind-tunnel tests of jet control on the stall characteristics of NACA0021 airfoil are conducted. By systematic comparison tests including measurements about model aerodynamic forces, flow velocity on the airfoil upper surface based on Particle Image Velocimetry (PIV) technology and velocity profiles in boundary layer, the influences of synthetic jet parameters on control effects of airfoil stall characteristics are further explored. A large number of experimental results indicate that control effects on airfoil lift and stall angle of attack (AoA) due to jet angle are sensitive to the momentum coeffcient of synthetic jet. Overall, the control effects of the almost tangential jet are more effective when the momentum coeffcient of synthetic jet is large enough: increments about 23.6% of maximum lift coeffcient and 5° of stall-incidence of airfoil are obtained when the jet angle is 30° with jet momentum coeffcient being 0.033. On the other hand, a larger jet angle is required to achieve the best control effect when the momentum coeffcient is small: when the momentum coeffcient is about 0.0026, the normal jet is most effective on increasing the maximum lift coeffcient of airfoil by an increment about 9.2%.
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    • References (11)
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