增程飞行器高超声速飞行的动态特性

Dynamic Characteristics of Hypersonic Flight for Increasing Range Vehicles

研究了增程飞行器高超声速飞行时的动态特性。短程导弹和火箭弹等高超声速飞行来源于增程的实际需要,从超声速到高超声速飞行所遇到的主要飞行动力学问题是,尽管在增程前低超声速时具有良好稳定性,但在高超声速飞行中会丧失稳定性并导致复杂的锥动。通过飞行和风洞实验表明:高超声速飞行时增程飞行器固有的横侧向稳定特性丧失,带有弱滚转阻尼的不稳定荷兰滚振荡将导致滚转-偏航耦合,此外还存在由耦合导致的轻微不稳定拟周期模态和滚动共振。

The purpose of this paper is to study the dynamic characteristics of increasing range vehicles that will enable a hypersonic flight.The paper first show hypersonic flight of short range missiles and rocket projectiles derived from practical considerations of increasing range.Then it reviews major flight dynamic problems encountered in high speed flight from supersonic to hypersonic,namely,during hypersonic flight these vehicles lose stability which leads to flight trajectory exhibited complex coning motions,although they remain in a stable flight in low supersonic speed before increasing range.Next,based on flight testing results and wind-tunnel testing results,researching results present that inherent lateral stability characteristics of the vehicle in hypersonic flight may present significant stability deficiencies relating to a weak roll damping in combination with a partially unstable dutch roll oscillation featuring high roll-yaw-couplings.Moreover,the dutch roll can also alter into an unstable aperiodic mode,which leads to roll resonance.