摘要
为满足长航程及高速飞行需求,乘波体外形越来越趋于扁平化、细长化,导致其在气动载荷作用下会出现显著的气动弹性效应。通过计算流体力学/计算结构力学/刚体动力学(CFD/CSD/RBD)耦合方法求解流动控制方程和飞行动力学方程,系统研究了不同结构刚度和来流条件下弹性效应对乘波体配平特性和动力学稳定性的影响。研究结果表明:随着结构刚度降低,乘波体配平迎角增大,配平升阻比下降,其主因是弹性变形导致气动中心前移,静稳定性降低;来流马赫数和结构变形对乘波体静稳定性的作用效果相反,且后者的减弱效果占主导作用;整体而言,刚弹耦合效应使乘波体俯仰动稳定性下降,且不同刚度下俯仰动导数随来流马赫数的变化趋势也不相同。
In order to satisfy the demand of the long range and high-speed flight,the shape of waverider is becoming more slender and flatter,which makes them more prone to aeroelastic effect under the aerodynamic loading.The flow governing equations and flight dynamic equations are solved by the CFD/CSD/RBD coupling method,and the effect of elastic deformation on the trimming condition and the dynamic stability of waverider were analyzed under different structural stiffness and inflow conditions.The results show that as the structural rigidity decreases,the trimming attack angle increases and the lift-drag ratio decreases.And the main reason is that the elastic deformation moves the dynamic center forward,which reduces the static stability of waverider.The effect of Mach number and the structural deformation on static stability is qualitatively different,while the weakening effect of the latter factor is dominant.Overall,the pitching dynamic stability decreases due to rigid-elastic coupling,and the variation trend of the pitching dynamic derivative with Mach number is different under different rigidity.
作者
尚逸鸣
华如豪
袁先旭
唐志共
王中伟
SHANG Yiming;HUA Ruhao;YUAN Xianxu;TANG Zhigong;WANG Zhongwei(College of Aerospace Science and Engineering,NUDT,Changsha 410073,China;State Key Laboratory of Aerodynamics,CARDC,Mianyang 621000,China)
出处
《飞行力学》
CSCD
北大核心
2021年第3期14-19,26,共7页
Flight Dynamics
基金
国家数值风洞工程资助项目(NNW-NB-JC-021)
空气动力学国家重点实验室基金资助(SKLA2019010301)。
