悬停状态桨尖形状对中小型旋翼的影响∗

摘要

To improve aerodynamic performance of small and medium rotor in hover, considering the influence of paddle blade turbulence, the aerodynamic performance and change ruler of different paddle blade tip shape were analyzed. The paddle blade turbulence can be re-duced by sharpening paddle blade and the resisting moment of rotor in hovering. The turbulence reduces downwash speed in the blade tip and enlarges angle of attack of paddle blade section. Along with increase of rotation speed and Reynolds number, the superiority of sharp-ened paddle blade is clear.%针对悬停状态中小型飞行器气动性能，考虑桨尖涡对飞行器桨叶桨尖的影响，分析了不同形状桨尖桨叶气动特性及其变化规律。尖削桨尖旋翼可有效削弱桨尖涡，从而降低旋翼的阻力距。桨尖涡导致桨尖处下洗速度减小，使桨尖处桨叶截面翼型的实际迎角增大。随着转速的提高，桨尖雷诺数的增大，尖削桨尖的优势才逐渐体现。