플래핑 운동의 공기역학적 특성에 관한 연구

A Study on Aerodynamic Characteristics of Flapping Motion

  • 김윤주 (고려대학교 기계공학과 대학원) ;
  • 오현택 (고려대학교 기계공학과 대학원) ;
  • 정진택 (고려대학교 기계공학과) ;
  • 최항철 (한국과학기술연구원 열 유동제어센터) ;
  • 김광호 (한국과학기술연구원 열 유동제어센터)
  • 발행 : 2005.12.01

초록

Birds and insects flap their wings to fly in the air and they can change their wing motions to do steering and maneuvering. Therefore, we created various wing motions with the parameters which affected flapping motion and evaluated the aerodynamic characteristics about those cases in this study. As the wing rotational velocity was fast and the rotational timing was advanced, the measured aerodynamic forces showed drastic increase near the end of stroke. The mean lift coefficient was increased until angle of attack of $50^{\circ}$ and showed the maximum value of 1.0. The maximum mean lift to drag ratio took place at angle of attack of $20^{\circ}$. Flow fields were also visualized around the wing using particle image velocimetry (PIV). From the flow visualization, leading-edge vortex was not shed at mid-stroke until angle of attack of $50^{\circ}$. But it was begun to shed at angle of attack of $60^{\circ}$.

키워드