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首页> 外文期刊>The European physical journal, E. Soft matter >Nonequilibrium processes in meta-stable media
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Nonequilibrium processes in meta-stable media

机译：Meta稳定媒体中的非预测过程

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Meta-stable systems are those staying in the local equilibrium state: being slightly deviated from it they return to the equilibrium, but in case deviation surpasses a critical value those systems fall down to another equilibrium state. Chemically reacting gaseous mixture provides a typical example of a meta-stable system. The paper is aimed at numerical and experimental investigation of detonation initiation in hydrogen-air mixtures due to focusing of a shock wave reflected inside a wedge. Both numerical and experimental investigations were conducted. Comparison of numerical and experimental results made it possible to validate the developed 3D transient mathematical model of chemically reacting gas mixture flows incorporating hydrogen-air mixtures. Kinetic schemes and turbulence models were improved based on comparison of numerical and experimental results. Several different flow scenarios manifest in the reflection of shock waves all being dependent on the incident shock wave intensity: reflection of the shock wave with lagging behind the combustion zone, formation of a detonation wave in reflection and focusing, and intermediate transient regimes.
机译：亚稳态系统是那些处于局部平衡状态的系统：稍微偏离它，它们就会回到平衡状态，但如果偏离超过临界值，这些系统就会下降到另一个平衡状态。化学反应的气体混合物提供了亚稳系统的典型例子。本文旨在数值和实验研究由于楔形物内反射的冲击波聚焦而在氢-空气混合物中起爆。进行了数值和实验研究。将数值结果与实验结果进行比较，可以验证所开发的包含氢-空气混合物的化学反应气体混合物流动的三维瞬态数学模型。通过数值和实验结果的比较，改进了动力学方案和湍流模型。激波反射中表现出几种不同的流动情况，所有这些情况都取决于入射激波的强度：激波反射滞后于燃烧区，在反射和聚焦中形成爆轰波，以及中间瞬态状态。

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