旋转固体火箭上面级章动不稳定动力学机理分析  

Research on mechanics of nutation instability for a spinning solid rocket upper stage

作　　者：任天荣 周志超 

机构地区：[1]上海机电工程研究所,上海201109

出　　处：《应用力学学报》2016年第6期942-947,1114,共6页Chinese Journal of Applied Mechanics

基　　金：上海市自然科学基金(No.16ZR1415900);上海市"扬帆计划"项目(No.15YF1405600)

摘　　要：针对上面级旋转固体火箭发动机出现的章动不稳定现象,即锥形运动发散,通过对变质量陀螺运动方程干扰力矩项的研究,得出了发动机内部流动质量产生的附加侧向扰动力矩是诱发上面级固体火箭锥形运动发散的动力学根源,并得到了其章动不稳定的发生判据。基于此判据,给出了通过提高火箭自旋转速和横向转动惯量来解决上面级旋转固体火箭发动机章动不稳定现象的方法;并得出较高的气动静稳定设计和低密度的高空环境,是尾翼稳定旋转火箭弹发生"掉弹"现象的根源。Directed to the divergence phenomenon of nutation instability(also referred to as 'coning motion') for the spin stabilized solid rocket upper stage, the result that the phenomenon of nutation is consequent on the additional transverse disturbing torque of the unsteady internal flow in jet, is unearthed with the help of bring the torque item of the gyroscopic equation with variable mass under study, and the stability criterion of the nutation attitude is obtained. Based on the stability criterion, the measure of bringing the nutation instability phenomenon for a spin solid rocket at upper stage under control is provided by increasing both the spin speed of the rocket and the transverse moment of inertia, and that the cause for the 'unusual falling' of the spinning artillery rocket are the larger aerodynamic static stability and the smaller upper air density is given.

关 键 词：旋转火箭上面级 章动 稳定性 变质量陀螺力学 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]