多变指数γ对气相爆轰波结构的影响
The Effect of the Polytropic Index γ on the Structure of Gaseous Detonations
摘要：
本研究旨在阐明多变指数（即，理想气体中的比热比）对爆炸结构的影响。这是解决二维数值模拟。为了便于阐明气体动力学的作用，一个简单的Arkanius动力学定律用于化学模型。活化能，归一化的冲击温度，保持恒定，以获得相同的反应速率的温度敏感性，在所有考虑的混合物。这一过程将气体动力学效应与化学效应分离开来。数值结果表明，在低多变指数的混合物，对流混合比具有较高多变指数的混合物增强。使用拉格朗日示踪剂的混合进行评估。此外，具有低多变指数的混合物被发现比具有高多变指数的混合物具有更短的反应长度。此外，在本研究中考虑的参数范围内的结果表明，马赫干分叉爆轰由于喷射主要是一个气动驱动机制。
英文摘要：
The present study aims to clarify the effect of the polytropic index (i.e., the ratio of specific heats in the context of a perfect gas) on the detonation structure. This is addressed by two-dimensional numerical simulations. To ease the clarification of the role of gasdynamics, a simple Arrhenius kinetic law is used for the chemical model. The activation energy, normalized by the shock temperature, is kept constant to obtain the same reaction rate sensitivity to temperature in all considered mixtures. This procedure dissociates the gasdynamic effects from the chemistry effects. The numerical results reveal that in mixtures with low polytropic indicies, the convective mixing is enhanced compared to mixtures with higher polytropic indicies. The mixing is evaluated using Lagrangian tracers. Moreover, mixtures with low polytropic indicies are found to have a shorter reaction length than mixtures with high polytropic indicies. Also, for the range of parameters considered in this study the results indicate that Mach stem bifurcation in detonations due to jetting is primarily a gasdynamic driven mechanism.
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