大长细比导弹气动弹性数值计算研究

采用一体化求解非定常N-S方程、结构变形方程及角运动方程的方法,研究结构参数和质量偏心对导弹的弹性运动和角运动的影响.算例结果表明:使用动网格技术和非定常N-S方程求解器能够实现气动、结构和角运动方程的一体化求解;在高马赫数下,结构变形不大时,结构振动变形所引起的非定常气动力较小,对导弹的角运动影响不大;存在质量偏心的导弹,当转速等于角运动的振动频率时,会发生共振现象.

Numerical Study on the Aeroelasticity of a Large Fineness Ratio Projectile

A time-dependent analysis, coupling the unsteady N-S equation, beam vibration equation and angular motion equation, was formulated to numerically simulation flight motion of an elastic large fineness ratio projectile. This method was used to study the influences of stiffness and structure damping on the flight of projectile. The result indicated that the unsteady aerodynamic induced by vibration was too small to change angular motion of the projectile. A divergence in flight motion was observed when steady state rotation speed of the projectile, with slight radial center of gravity offset, is near angular motion frequency.