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研究了带液氮冷屏蔽罩(冷罩)的自旋弹头在自由飞行段中,冷罩多孔介质层内液氮不断消耗时弹头姿态的变化规律.针对工程上无法利用数值计算直接研究多孔介质中液氮消耗对弹头姿态运动影响的问题,以均相模型分析多孔介质层内气液混合物的运动规律,建立了均相介质在离心力作用下的渗流运动方程.对此方程进行无量纲化,分析了均相介质的运动规律,得到了变质量弹头的姿态动力学模型.通过分析与仿真发现,自旋角速度随冷罩内液氮消耗而不断增大,非自旋方向角速度不为零时,其运动频率不断增大,且会产生运动阻尼,但频率变化很小,运动阻尼量级也极小,工程中可忽略冷罩中液氮消耗对非自旋方向的影响.
In the free flight section, the change rule of the warhead attitude of the projectile with liquid nitrogen in the cryogenic medium of the cold hood is studied. The numerical calculation of the porous medium In which the influence of liquid nitrogen consumption on warhead pose movement is analyzed. The motion law of gas-liquid mixture in porous media is analyzed by homogeneous model, and the seepage motion equation of homogeneous medium under centrifugal force is established. The equation is dimensionless, The motion law of homogeneous medium is analyzed and the attitude dynamics model of variable mass warhead is obtained.According to the analysis and simulation, it is found that the angular velocity of spin increases with the consumption of liquid nitrogen in the cold hood and the non-spin angular velocity is not zero , Its movement frequency is increasing, and will produce the motion damping, but the frequency change is very small, the magnitude of the motion damping is also very small, the project can ignore the loss of liquid nitrogen in the cold hood on the non-spin direction.