ZHAO Aobo1,2, ZHENG Guannan1,2, HUANG Chengde1, YANG Guowei1,2, CHEN Weiqi3
1.Key Lab for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, CAS, Beijing 100190, China;
2.School of Engineering Science, University of Chinese Academy of Sciences (CAS), Beijing 100049, China;
3.Beijing Institute of Mechanical and Electrical Engineering, Beijing 100074, China
Abstract：Ground effect refers to the phenomenon that the lift increases and the drag decreases due to the interference of the ground when the wing is flying close to the ground. The ground effect on flutter characteristics is investigated in this paper. The computational fluid dynamics / computational structural dynamics coupling method is constructed for flutter calculations. The AGARD wing 445.6 is adopted to validate the flutter calculation method. On this basis, the flutter analysis of a three-dimensional wing close to the ground is carried out. Results show that the ground effect can increase the amplitudes of unsteady aerodynamic forces and this effect becomes more significant as the wing gets closer to the ground, so that the flutter speed decreases with the decrease of ground clearance. Then, the influence of angle of attack on flutter characteristics of ground effect wings is discussed. Different from the classical linear flutter theory without the ground effect, this work points out that the flutter speed of ground effect wing is related to the angle of attack. In the region of ground effect, the increase of angle of attack will increase the static deformation for flutter, raising the wing and resulting in the increase of ground clearance, so that the ground effect is weakened and the flutter speed increases.
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