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http://dx.doi.org/10.5139/IJASS.2008.9.1.111

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)
Publication Information
International Journal of Aeronautical and Space Sciences / v.9, no.1, 2008 , pp. 111-120 More about this Journal
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.
Keywords
Pitch-Oscillating Airfoil; Flow Pattern; Blowing Jet; Flow Separation Control;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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