论文标题
腐烂的冲击波背后的点火：爆炸细胞
Ignition Behind Decaying Shock Waves : Detonation Cells
论文作者
论文摘要
我们首先在分析和数值上解决衰减冲击波背后的启动问题。沿着粒子路径的点火横穿冲击的点火图是根据其体积扩展来分析的，这些膨胀是通过冲击变化方程来评估的，它是减震强度，衰减速率和曲率的函数。封闭式溶液是针对1步和2步化学模型的。使用详细的热化学模型与数值模拟有着非常吻合的分析结果。新开发的模型用于研究爆炸细胞中铅冲击背后的点火。在非常常规的H $ _2 $ -O $ _2 $ -AR系统中，报告了针对蜂窝动力学的新实验。发现大约一半的气体穿越冲击的气体被淬灭。在实验中，这种气体在横波后面反应。还分析了在非常不规则的甲烷氧系统中的实验。在这些实验中，由于休克非稳态，超过70％的气体越过冲击。这些气体以未反应的口袋为生，由于湍流扩散而反应速度较慢并烧毁。该研究的主要结论是，由于休克非稳态而导致的不规则和规则的细胞爆发都会发生点火猝灭。
We first address the problem of initiation behind decaying shock waves analytically and numerically. The ignition along a particle path crossing the shock is analysed in terms of its volumetric expansion, evaluated as a function of the shock strength, decay rate, and curvature using the shock change equations. Closed form solutions are derived for 1-step and 2-step chemistry models. The analytical results are found in excellent agreement with numerical simulations using a detailed thermo-chemical model. The newly developed model is used to study the ignition behind the lead shock in detonation cells. New experiments are reported for cellular dynamics in a very regular H$_2$-O$_2$-Ar system. It is found that the ignition of approximately half of the gases crossing the shock is quenched. In the experiments, this gas reacts behind the transverse waves. Previous experiments in a very irregular system of methane-oxygen are also analysed. In these experiments, more than 70\% of the gases crossing the shock are quenched due to shock non-steadiness. These gases are shed as non-reacted pockets, which react much slower and burn out due to turbulent diffusion. The main conclusion of the study is that both irregular and regular cellular detonations experience ignition quenching due to shock non-steadiness.
