共轴式直升机上下旋翼之间气动干扰的风洞实验研究

 介绍了共轴式直升机在悬停和前飞时, 上下旋翼之间的气动干扰及干扰随前进比变化的情况。风洞实验结果表明, 悬停时, 在两旋翼的相互干扰中, 上旋翼对下旋翼的干扰较大, 拉力系数越大, 干扰相对增强。前飞时, 上旋翼对下旋翼的干扰减弱, 下旋翼对上旋翼的干扰增强。在前进比L = 0～0.05 之间, 上旋翼对下旋翼的干扰最大,L = 0.1 时, 下旋翼对上旋翼干扰最大,L = 0～0.1 之间, 两旋翼之间干扰较严重。

Experimental Investigation of the Aerodynamic Interaction Between Upper and Lower Rotors of a Coaxial Helicopter

This paper presents the analyses of the aerodynamic interaction between the two rotors of a coaxial rotor helicopter and the change of interaction with the increase of the advance ratio.Wind tunnel experimental results show that the effect of the upper rotor on the lower rotor is larger than the effect of the lower rotor on the upper rotor in hover.As the thrust coefficient increases,the mutual interaction increases also.In forward flight the upper rotor decreases its effect on the lower rotor while the lower rotor increases its effect on the upper rotor.For the advance ratio between 0 to 0.05,the upper rotor has its largest effect on the lower rotor,while the lower affects the upper the greatest when the advance ratio is 0 1.The mutual influence appears the most evident in the range of the advance ratio from 0 to 0 1.