AM06-11-018 翼型上で発生する層流剥離泡の失速付近で観察される準周期的挙動について(境界層とせん断流・遷移(4),一般講演)

概要

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Laminar separation bubbles formed on a NACA0012 airfoil were investigated to clarify the mechanism of their quasi-periodic behaviors near the onset of airfoil stall. The chord Reynolds number was Re_c=1.3×10^5. The flow over the airfoil oscillates at a low frequency when α=11.5°. This oscillation is a switching between a flow that is attached to the surface and the one that is largely separated from the surface. Flow velocity near the leading-edge fluctuates in synchronization with this flow switching. Wavelet analysis was applied to the velocity fluctuation. The frequency of the flow switching within the tested range of α near stall was measured. Instantaneous flowfield was also investigated by a particle image velocimetry. Large vortices were observed over the airfoil when the flow switches from a large separated state to an attached flow.
日本流体力学会の論文
2006-09-05