Numerical simulation of separation characteristics for internally buried weapon at high Mach number
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摘要:
高马赫数（
Ma >2）武器舱剪切层和激波更强，其流动特性与通常的亚、跨、超声速武器舱也有所不同，从而可能导致内埋武器的分离特性也不同。基于非结构混合网格流场解算器NNW-FlowStar，在前期针对高马赫数空腔流动模拟建立的改进HLLE++格式和自适应混合网格技术的基础上，采用数值模拟手段对比分析了Ma =4和Ma =2时的内埋武器分离特性，研究了环状板、横柱、锯齿和圆柱阵列等不同前缘流动控制措施对高马赫数（Ma =4）武器分离特性的影响，为高马赫数内埋武器的安全分离方案设计提供指导。研究表明：高马赫数（Ma =4）时，由于武器舱流动特性和武器舱前缘激波的激波角的不同，导致起始时刻内埋武器与武器舱之间的通道效应和分离过程的激波干扰不同，使得高马赫数（Ma =4）时内埋武器的姿态角和俯仰力矩与马赫数为2时差异较大；采取前缘扰流措施后，内埋武器的抬头趋势有所减弱，偏航角有所减小，有利于导弹的安全分离。Abstract:The internal weapon may exhibit distinct separation characteristics due to the greater shear layer and shock wave of the high Mach number (
Ma > 2) weapon bay, as well as distinct flow characteristics compared to the subsonic, transonic, and supersonic weapon bays. In this paper, using the unstructured hybrid mesh flow solver NNW-Flow Star, and based on the improved HLLE++ format and adaptive hybrid mesh technology established in the previous simulation for high Mach number cavity flow, the numerical simulations are used to compare and analyze the separation characteristics of the internal weapon atMa =4 andMa =2. The effects of different leading edge flow control measures such as annular plates, transverse columns, serrations and cylindrical arrays on the separation characteristics of high Mach number (Ma =4) weapons are investigated to provide guidance for the design of safe separation schemes for internal weapons at high Mach number. The findings show that at a high Mach number (Ma =4), the weapon bay’s distinct flow characteristics and the shock wave’s different shock angle at the leading edge of the weapon bay cause the internal weapon and weapon bay to have different channel effects at first and different shock interference during the separation process. As a result, the internal weapon’s attitude angle and pitch moment at a high Mach number (Ma =4) differ from those atMa =2. After the leading edge flow control measures are adopted, the rising trend of the positive pitching moment for internal weapons is weakened and the yaw angle is reduced, which is conducive to the safe separation of missiles. -
图 2 空腔底部压力分布比较（Ma=2.86）
Figure 2. Comparison of pressure distribution of the bottom of cavity floor （Ma=2.86）
图 4 空腔底部压力分布比较（Ma=0.9）
Figure 4. Comparison of pressure distribution of the bottom of cavity floor （Ma=0.9）
图 7 外挂物质心位移、姿态角对比
Figure 7. Attitude angle comparison of、 heart displacement external hanging objects
图 9 基于网格自适应技术的分离投放模拟过程
Figure 9. Progress of weapon separation simulation based on the mesh adaptive technique
图 13 t=0.2 s，Ma=2和Ma=4时马赫数压力云图对比
Figure 13. Mach number and pressure comparison contour at Ma=2 and Ma=4 for t=0.2 s
图 14 t=0.26 s，Ma=2和Ma=4时马赫数压力云图对比
Figure 14. Mach number and pressure contour comparison at Ma=2 and Ma=4 for t=0.26 s
图 15 t=0.38 s，Ma=2和Ma=4时马赫数压力云图对比
Figure 15. Mach number and pressure contour comparison at Ma=2 and Ma=4 for t=0.38 s
图 17 不同控制措施下导弹位移对比
Figure 17. Comparison of missile displacements under different control measures
图 18 不同控制措施下姿态角对比
Figure 18. Comparison of Attitude angle for different control methods
表 1 空腔模型计算参数
Table 1. Calculation parameters of cavity model
Ma 攻角α/(°) 侧滑角β/(°) 来流静压P/Pa 来流静温T/K 2.86 0 0 3114.2 123.3 
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表 2 内埋武器质量特性
Table 2. Quality characteristics of internally buried weapon
质量/kg Ix/（kg·m2） Iy/（kg·m2） Iz/（kg·m2） 1 150.0 48 1 960 1 960
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