近地飞行时旋翼的气动力及桨叶挥舞运动

AERODYNAMIC FORCES AND BLADE FLAPPING MOTION OF A ROTOR IN FORWARD FLIGHT WITH GROUND EFFECTS

基于对旋翼近地飞行时流场的Ｎ－Ｓ方程计算，计算并讨论了近地飞行时，旋翼拉力、扭矩系数及桨叶挥舞角随前进比、离地高度的变化情况。结果表明，在地面涡出现的飞行条件下，与无地面效应的情形相比，旋翼拉力和侧倾角有显著变化。

Based on the previous computation for a rotor flow field in forward flight near ground, the thrust coefficient, torque coefficient and blade flapping angles are calculated and analysed against the advance ratios and flight heights. The results show that the ground effects play a very important role in the thrust coefficient and blade lateral tilt angle.