International Journal of Aeronautical and Space Sciences

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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A PIV Study of Flow Patterns Over Stationary and Pitch-Oscillating Airfoils with Blowing Jet

  • Lee, Ki-Young (Department of Mechanical Engineering Korea Air Force Academy) ;
  • Chung, Hyoung-Seog (Department of Mechanical Engineering Korea Air Force Academy) ;
  • Cho, Dong-Hyun (Department of Mechanical Engineering Korea Air Force Academy)
  • Published : 2008.05.10
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Abstract

A particle image velocimetry (PIV) technique was employed to investigate the effects of blowing jet on the flow characteristics over stationary and pitch-oscillating airfoils. The Reynolds number was $7.84{\times}10^5$ based on the chord length. It was found that for stationary airfoil cases, continuous and pulsating blowing jets successfully reduced separated wake region at high angles of attack. A comparison study of two different types of jet blowing indicated that pulsating jet is more effective than continuous jet for flow separation control. Pulsating leading-edge blowing postpones flow separation and increased stall angle of attack by $2^{\circ}{\sim}3^{\circ}$. For pitch-oscillating airfoil cases, the PIV results showed that blowing jet efficiently delays the separation onset point during pitch-up stroke, whereas it does not prevent flow separation during pitch-down stroke, even at angles of attack smaller than static ones.

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References

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