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热化学非平衡流模拟中广泛应用的双温度或多温度模型不能描述分子在各振动能级上的分布,只能假设其满足振动温度下的Boltzmann分布。通过采用态-态模型研究非平衡过程中粒子的能级分布特点,有望为改进双温度或多温度模型提供思路。对静止的N2/N气体混合物,在各类不同初始条件和控制温度、压力下,采用态-态模型研究气体的化学组成和分子振动能级分布演化规律,分析各类微观过程的特征与贡献,结果表明:平动-振动能量交换过程起支配作用,促使振动能级分布趋于平动温度下的Boltzmann分布,而振动-振动能量交换过程主要影响能级分布变化的过渡过程特点;离解区和复合区能级分布的变化特点不同;关于非平衡过程中粒子微观分布的研究结果可为改进高超声速非平衡流模拟中的热化学模型提供参考依据。
The bi-temperature or multi-temperature models widely used in thermodynamic non-equilibrium flow modeling can not describe the distribution of molecules at each vibrational level, and can only be assumed to satisfy the Boltzmann distribution at vibrational temperatures. By using the state-state model to study the energy level distribution of the particles in the non-equilibrium process, it is expected to provide ideas for improving the dual-temperature or multi-temperature model. For stationary N2 / N gas mixtures, the chemical composition and evolution of molecular vibrational energy levels of gases were studied by using the state-state model under various initial conditions and controlled temperature and pressure. The characteristics and contributions of various microscopic processes The results show that the translational-vibrational energy exchange plays a dominant role in promoting the distribution of vibrational energy level to the Boltzmann distribution at translational temperature, while the vibrational-energy exchange process mainly affects the characteristics of the transitional process of energy level distribution. The dissociation region And the characteristics of energy level distribution in the composite region are different. The results of the study on the microscopic distribution of particles in the non-equilibrium process can provide a reference for improving the thermochemical model in hypersonic non-equilibrium flow simulation.