质心、弯心及压力中心对机翼动力响应的影响

本文以某一大展弦比机翼为例,通过调整结构配重和主梁沿弦长方向的位置来改变质心和弯曲中心,采用基于CFD/CSD耦合方法分析质心、弯曲中心及压力中心的相对位置对机翼动力响应的影响。计算结果表明,质心的位置对机翼的动力响应影响非常大。质心位置相对靠前时,翼尖位移响应最剧烈；当质心位置相对靠后时,机翼一阶扭转响应最剧烈；弯曲中心向后移动,翼尖位移的最大幅值逐渐增大,但翼尖的扭转角振荡剧烈程度逐渐减小。弯曲中心宜选在压力中心之后。当弯曲中心在压力中心之前,且质心布置在弯曲中心之后,会造成机翼扭转发散。

Effect of Centroid, Bending Center and Pressure Center on The Dynamic Response of Aerofoil

The relative positions of centroid, bending center and pressure center of aerofoil have an important influence on the flight performance, safety and ride quality of an aircraft. In this paper, the centroid and bending center of large aspect ratio aerofoil are changed by adjusting the weight of the structure and the position of the main beam along the chord direction. The influence of the relative positions of the centroid, bending center and the pressure center on the aerodynamic response of the aerofoil are analyzed by CFD/CSD. The results show that the centroid has a great influence on the dynamic response of the aerofoil. The response of the tip-wing displacement will be the intensest if the centroid is in front position. But when the centroid is relatively backward, the first-order aerofoil torsion response will be intensest. When the bending center moves backwards, the maximum amplitude of the tip-wing displacement gradually increases, but the tip-wing torsional angle simultaneously decreases. Bending centers should be set after the pressure center. When the bending is placed before the pressure center, and the centroid is placed behind the bending center, the aerofoil will twist and then diverge.