Numerical Simulation of Secondary Initiating Process of the Flame-Detonation Transmission in Aerospace Pyrotechnic System
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摘要:针对火工品系统中典型多级序列传爆环节机理认识不清，导致航天飞行器发射任务面临风险的问题，从结构间隙隔离段内爆轰波的熄爆/再起爆过程的角度出发，建立不同几何构型下的数值计算模型，考察化学反应活性对引发二次爆轰的临界隔离段长度及临界装药长度的影响规律。研究表明，不同几何构型下爆轰波再起爆现象的发生均通过隔离段与下游装药交界处的热点效应引发，且临界隔离段长度随下游装药反应活性的减弱而减小；相应地，不同几何构型下下游装药临界长度随反应活性的变化规律更为复杂，这是由二维流场内横波的摆动和相互碰撞所导致的。
Abstract:The mechanism of the flame-detonation transmission among multi-stage sequences in aerospace pyrotechnic system is indefinable, which leads to a great risk for launching missions. In this study, the suppression and re-initiation of detonation during its propagation process in the inert isolation of structures were investigated through both one-dimensional and two-dimensional numerical simulations, and the influences of chemical reactivity on the critical values of isolation length and explosive loading size were researched simultaneously. The results indicate that the re-initiation of detonation in both numerical dimensions are caused by the hot spot effect occurred on the interface between inert zone and reaction zone, in which the critical isolation length for detonation ignition is proportional to the reaction activity. The relationship between chemical reactivity and explosive loading size is more complicated, and the differences between one-dimensional and two-dimensional computations are determined by the oscillation and collision of transversal waves in detonation flow field.
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