24th Congress of International Council of the Aeronautical Sciences, 29 August-3, September 2004, Yokohama, Japan
Paper ICAS 2004-2.10.4 (St.)

FLOW VISUALIZATION AND PIV MEASUREMENTS OF LAMINAR SEPARATION BUBBLE OSCILLATING AT LOW FREQUENCY ON AN AIRFOIL NEAR STALL

H. Tanaka
Department of Aeronautics & Astronautics, University of Tokyo, 113-8656, Japan

Keywords: laminar separation bubble, stall, low-frequency oscillation, PIV, wavelet analysis

Laminar separation bubbles formed on NACA 0012 airfoil were investigated to clarify their quasi-periodic behavior near the onset of airfoil stall. Wavelet analysis was applied to the flow velocity fluctuation signals. Detailed flowfield during the flow oscillation were studied by smoke flow visualization and flowfield measurements using particle image velocimetry.

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