摘要
为研究地面效应对飞行器的气动弹性特性的影响,基于计算流体力学(CFD),耦合求解结构动力学方程,建立了气动弹性求解系统。通过涡诱导的圆柱自由振荡算例和Isogai的二元气动弹性算例,分别研究了地面效应对气动弹性动态响应和颤振边界的影响。研究结果表明:在地效作用下,涡街的对称性及发展受到影响,圆柱的动态响应幅值减小,频率增加,越靠近地面影响越显著;地效作用下,二维翼型在亚声速阶段的颤振速度下降,跨声速阶段,颤振边界凹坑范围扩大,颤振速度与激波位置密切相关。
To study the influence of ground effect on the aeroelastic characteristics of an aircraft,an aeroelastic solver coupling with computational fluid dynamics （CFD） and a structural dynamics solver is developed.Then the influences of ground effect on aeroelastic dynamic response and flutter boundary are investigated through a vortex-induced oscillating cylinder and Isogai＇s two dimensional aeroelastic cases.The results indicate that,in ground effect,the symmetry and development of the vortex street is constrained,thus the dynamic response amplitude of the cylinder decreases and the frequency increases.The ground effect is greater as the models move near the ground.In ground effect,the flutter speed of the airfoil decreases in the subsonic region; In transonic region,the dip is enlarged and the flutter velocity is closely related with the position of shock waves.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2014年第8期2156-2162,共7页
Acta Aeronautica et Astronautica Sinica
关键词
计算流体力学
气动弹性
地面效应
动态响应
颤振
computational fluid dynamics
aeroelasticity
ground effect
dynamic response
flutter
