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Effect of Reduced Frequency on the Flow Pattern of Pitch Oscillating Elliptic Airfoil  

Lee, Ki-Young (공군사관학교 기계공학과)
Chung, Hyong-Seok (공군사관학교 항공우주공학과)
Sohn, Myong-Hwan (공군사관학교 항공우주공학과)
Publication Information
Journal of the Korea Institute of Military Science and Technology / v.9, no.4, 2006 , pp. 128-136 More about this Journal
Abstract
The purpose of this paper is to examine the dynamic stall characteristics of an elliptic airfoil when subject to constant pitch motions. In this study, which was motivated by the pressing need for a greater understanding of the reduced frequency$({\kappa})$ effects on flow patterns of elliptic airfoil, the various reduced frequencies were considered. The result confirms that the reduced frequency has a profound effects on the flow patterns. The increase of ${\kappa}$ accelerate the separation bubble bursting process up to ${\kappa}=0.10$, then diminish with further increase in ${\kappa}$. Compared with static condition, the dynamic pitching airfoil delays stall angle approximate $4{\circ}{\sim}5{\circ}$ during pitch-up stroke for ${\kappa}=0.10$. Results from this qualitative analysis provided valuable insight Into the control of dynamics stall.
Keywords
Pitch Oscillating Airfoil; Unsteady Flow Separation; Dynamic Stall; Reduced Frequency; Elliptic Airfoil; Particle Image Velocimetry;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
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