Abstract
Weissinger의 방법을 기반으로 양력선 방법을 지면효과를 고려한 해석이 가능하도록 확장하였다. 이 방법을 이용하여 가로세로비 10의 타원형 날개와 인간동력항공기 날개에 대해 지면효과에 의한 공력성능 변화를 예측하였다. 날개가 지면에 가까워질수록 날개의 와류강도는 약간 증가하지만 내리흐름은 크게 감소한다. 인간동력항공기 날개의 경우에 날개가 지면에 가까울수록 양력은 증가하여 높이가 2m에서 양력계수는 지면효과를 받지 않을 때보다 5% 증가한다. 유도항력계수는 날개가 지면에서 스팬길이 높이에 있을 때에 지면효과가 없을 때보다 10% 감소하고 높이가 2m이면 55% 감소한다. The lifting-line method based on Weissinger's method is extended to be able to analyze the ground effect. The method is applied to predict the variation of aerodynamic performance due to ground effect for the elliptic wing with aspect ratio of 10 and the wing of human powered aircraft. While the vortex strength of the wing increases slightly, the downwash decreases significantly as the wing approaches to the ground. For the wing of human powered aircraft, the increment of lift at the height of 2m is 5% than the lift outside the influence of ground effect. The decrease of induced drag at the height of wing span is 10% and at the height of 2m is 55% than that out of ground effect.
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