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|標題:||Parallel interaction of incident vortex array with oscillating airfoil||作者:||Kuo, C.H.
|關鍵字:||helicopter noise||Project:||Journal of Aircraft||期刊/報告no：:||Journal of Aircraft, Volume 35, Issue 5, Page(s) 739-747.||摘要:||
Parallel interaction of an incident vortex array with a NACA 0012 airfoil in the form of sinusoidal oscillation was investigated experimentally, based on the concept of vorticity balance. It was found that the temporal-spatial variations of the local circulation can clearly reveal the convection of the highly distorted vorticity field over the airfoil. The phase-averaged near-surface now structure confirmed that the temporal-spatial variations of the surface vorticity generation are closely related to the formation and subsequent motion of the leading-edge separation vortex along the airfoil. During the upstroke portion of the oscillation cycle, significant amounts of the surface vorticity were generated from the leading edge of the airfoil. The phase information of the local circulation relative to that of the surface vorticity generation clearly indicated that the leading-edge separation vortex was induced immediately after the passage of the clockwise-rotating incident vortex. When compared with the oscillating airfoil in uniform dow the impingement of the incident vortex array on the oscillating airfoil increased the mean overall circulation around the airfoil over the oscillation cycle.
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