Attitude model of spinning warhead with cooled shroud when liquid nitrogen is consuming
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摘要: 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.Abstract: An attitude dynamics model of spinning warhead flying at free stage with a cooled shroud was established while liquid nitrogen filled in porous medium layer was consuming. The effect of liquid nitrogen movement to spinning warhead is difficult to calculate and simulate directly in engineering, according to this, an infiltration movement model of mixture in porous medium was gained by using homogeneous assumption, then was analyzed by applying dimensionless method, and an applied attitude model was obtained. Simulation shows that angular velocity is increasing in spinning direction, but in other directions, frequencies of angular velocities are increasing while these velocities are not zero, meanwhile, damp effects are appeared in the angular movement. Because of little impaction to attitude angular, both frequencies increase and damp effects could be ignored in practical project.
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Key words:
- cooled shroud /
- infiltration /
- porous medium /
- attitude dynamics model
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[1] Sessler A M,Cornwall J M,Dietz B,et al.A nuclear warhead with a cooled shroud[J].Countermeasures,2004,4:105-113 [2] 杨昌宝.液氮冷屏蔽罩换热机理研究 .南京:南京理工大学动力工程学院,2007 Yang Changbao.Mechanism investigation on heat transfer of Liquid-nitrogen cooled shroud .Nanjing:School of Energy and Power Engineering,Nanjing University of Science & Technology,2007(in Chinese) [3] 范燕萍.冷罩的结构设计与应力分析 .南京:南京理工大学机械工程学院,2007 Fan Yanping.Structure design and stress analysis of cooled shroud .Nanjing:School of Mechanical Engineering,Nanjing University of Science & Technology,2007(in Chinese) [4] 柴玉强.飞行器冷罩的结构设计与特性分析 .南京:南京理工大学机械工程学院,2008 Chai Yuqiang.Structure design and characteristic analysis of cooled shroud .Nanjing:School of Mechanical Engineering,Nanjing University of Science & Technology, 2008(in Chinese) [5] 陈金娥.关于渗流中流线不封闭的特性[J].力学季刊,2003,24(3):346-350 Chen Jine.Characteristics and conditions of unclosed flow streamline in porous media [J].Chinese Quarterly of Mechanics,2003,24(3):346-350(in Chinese) [6] Pascal J P,Pascal H.Pressure diffusion in unsteady non-Darcian flows through porous media[J].Eur J Mech,B/Fluids,1995,14(1):75-90 [7] Pascal J P,Pascal H.Non-linear effects on some unsteady non-Darcian flows through porous media[J].Int J Non-Linear Mechanics,1997,32(2):361-376 [8] 霍华德 F 拉塞.化学反应器设计(I):原理与方法[M].北京:化学工业出版社,1982 Rase H F.Chemical reactor design for process plants:principles and techniques [M].Beijing:Chemical Industry Press,1982(in Chinese) -
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