旋翼飘带稳定式子弹降落弹道特性

Descending Trajectory Characteristics of Rotor-Wing and Ribbon Stabilized Bullets

针对旋翼飘带稳定式子弹在降落飞行过程中的飞行不稳定现象,依据风洞实验获得的空气动力学参数及其随攻角、马赫数变化的非线性特征,进行了该子弹降落飞行的外弹道仿真研究。结果表明,该子弹在初始扰动较大的情况下,其飞行运动呈现非线性特征,自旋速度随时间变化,加速旋转和减速旋转情况都会出现,在一定的姿态和飞行速度条件下,容易发生转速闭锁。分析了转速闭锁条件下子弹可能发生的飞行不稳定特征,为该子弹的姿态控制和弹道稳定设计提供依据。

Aiming at the flight instability of the rotor-ribbon-stabilized bullet during the landing flight,the research of external flight of the bullet was carried out based on the aerodynamic parameters obtained from the wind tunnel experiment and its nonlinear characteristics with the angle of attack and Mach number.The results of trajectory simulation shows that under the condition of large initial disturbance,the flight motion of the bullet presents nonlinear characteristics,and its spin speed changes with time.Both acceleration rotation and deceleration rotation will occur.In a certain attitude and flight speed conditions,rolling lock-in is prone to occur.Furthermore,this article also analyzes the possible flight instability characteristics of the bullet under the condition of the rolling lock-in,which provides a basis for the attitude control and ballistic stability design of the bullet.