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Assessment of Vibrational Non-Equilibrium Effect on Detonation Cell Size

机译：振动非平衡对爆轰孔尺寸的影响评估

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摘要

To resolve the discrepancy between the numerical detonation cell size and experimental observations, simulations are conducted with a detailed thermochemical reaction model for a premixed argon-diluted hydrogen-oxygen mixture. Four different scenarios are considered: (i) The whole system is in thermodynamic equilibrium; (ii) the vibrational relaxation is considered and the translational-rotational temperature is used as the dominant temperature of the chemical reactions; (iii) the same non-equilibrium effect as in the second scenario is used along with Park's two-temperature model to account for the effect of vibrational temperature on chemical reaction rates; and (iv) a more physically consistent vibration-chemistry-vibration coupling model is adopted. The simulated detonation cell widths for the first and second scenarios are significantly lower than the experimental measurements, whereas reasonable agreement is observed for the third and fourth scenarios. These results confirm that the involvement of vibrational relaxation in the chemical reactions is an important mechanism in gaseous detonation.
机译：为了解决数值爆轰单元尺寸与实验观察值之间的差异，使用详细的热化学反应模型对预混合氩气稀释的氢氧混合物进行了模拟。考虑了四种不同的情况：（i）整个系统处于热力学平衡状态； （ii）考虑了振动弛豫，并将平移-旋转温度用作化学反应的主要温度； （iii）使用与第二种情况相同的非平衡效应以及Park的双温度模型来说明振动温度对化学反应速率的影响； （iv）采用物理上更一致的振动-化学-振动耦合模型。在第一种和第二种情况下，模拟的爆炸单元宽度明显低于实验测量值，而在第三种和第四种情况下，观察到合理的一致性。这些结果证实了振动弛豫在化学反应中的参与是气体爆炸的重要机理。

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