地效翼的颤振特性研究  

Flutter characteristics of ground effect wings

作　　者：赵奥博 郑冠男[1,2] 黄程德 杨国伟 陈玮琪[3] ZHAO Aobo;ZHENG Guannan;HUANG Chengde;YANG Guowei;CHEN Weiqi(Key Lab for Mechanics in Fluid Solid Coupling Systems,Institute of Mechanics,CAS,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences(CAS),Beijing 100049,China;Beijing Institute of Mechanical and Electrical Engineering,Beijing 100074,China)

机构地区：[1]中国科学院力学研究所流固耦合系统力学重点实验室,北京100190 [2]中国科学院大学工程科学学院,北京100049 [3]北京机电工程研究所,北京100074

出　　处：《振动与冲击》2023年第17期265-274,共10页Journal of Vibration and Shock

摘　　要：地面效应是指当机翼贴近地面飞行时,由于受到地面的干扰作用而引起升力增加和阻力降低的现象。研究地面效应对颤振的影响规律。建立基于计算流体力学/计算结构力学耦合的颤振计算方法,采用标模AGARD 445.6机翼对颤振计算方法进行验证。在此基础上,以贴近地面的三维机翼为研究对象开展颤振分析,研究指出地面效应增强了非定常气动力的幅值,而且离地越近这种效果就越明显,从而导致颤振速度随着离地高度的降低而减小。然后重点讨论了攻角对地效翼颤振的影响,与不考虑地效的经典线性颤振理论不同,指出地效翼的颤振速度与攻角有关,在地效区域内,增加机翼的攻角会使发生颤振时的静变形变大,导致机翼抬起和离地高度增加,地效减弱,使得颤振速度随攻角的增大而提高。Ground effect refers to the phenomenon that when a wing flies close to ground,its lift increases and its drag decreases due to interference of ground.Here,effects of ground effect on flutter were studied.The flutter calculation method based on computational fluid dynamics/computational structural dynamics(CFD/CSD)coupling was established,and this method was verified with the standard model AGARD 445.6 wing.On this basis,the flutter analysis was performed for a 3-D wing close to ground.The study showed that ground effect enhances amplitude of unsteady aerodynamic force,the closer the wing to ground,the more obvious the ground effect,this causes flutter speed to decrease with decrease in wing’s height above ground.Then,effects of wing’s angle of attack on flutter of ground effect wing were discussed emphatically.It was shown that different from the classical linear flutter theory not considering ground effect,here the flutter speed of ground effect wing is related to wing’s angle of attack;in range of ground effect,increase in wing’s angle of attack can increase wing’s static deformation during flutter to cause increase in wing’s height above ground and decrease in ground effect,so flutter speed increases with increase in angle of attack.

关 键 词：地面效应 计算流体力学/计算结构力学(CFD/CSD)耦合 颤振 

分 类 号：V215.3[航空宇航科学与技术—航空宇航推进理论与工程]