空气动力学学报Issue(3)：280-288,9.DOI:10.7638/kqdlxxb-2012.0139
态-态模型下 B2／B 混合物的热化学非平衡过程研究
Thermo-chemical nonequilibrium process in B2/B mixture with state-to-state model
摘要
Abstract
The two-temperature or multi-temperature approach used in the study of nonequlibrium flow cannot describe the distribution at vibrational energy levels and assumes Boltzmann distribution under vibra-tional temperature instead.Detail study of the characteristics of nonequilibrium process with state-to-state model may inspire the improvement of the two-temperature or multi-temperature approach.In this paper, the state-to-state model is used to simulate the thermo-chemical nonequilibrium process of a stationary closed N2/N mixture system.The time evolution of the density of N and N2 at different levels and the relaxation of vibrational distribution under different controlling conditions (temperature,pressure or density)and differ-ent initial conditions are analyzed,the characteristics and contribution of each micro processes are investiga-ted.The results show that:(1 )The vibrational-translational energy exchange processes are the important processes which drive the vibrational distribution to Boltzmann distribution,while the vibrational-vibrational energy exchange processes only affect the characteristic of the transition course.(2)The departure of popu-lation distribution from Boltzmann distribution prevails in thermo-chemical nonequilibrium flow,and the evolution of the vibrational distribution for dissociation regime and that for recombination regime are differ-ent.(3)The results obtained from the study of thermo-chemical process with state-to-state model would help to thorough comprehension of the nonequilibrium phenomenon,and may provide reference for the im-provement of thermo-chemical model used in the simulation of hypersonic nonequilbrium flow.关键词
态-态模型/热化学非平衡/振动能级分布/数值模拟Key words
state-to-state model/thermo-chemical nonequilibrium/vibrational distribution/numerical simulation分类
航空航天引用本文复制引用
徐丹,曾明,张威,柳军..态-态模型下 B2／B 混合物的热化学非平衡过程研究[J].空气动力学学报,2014,(3):280-288,9.基金项目
国家自然科学基金 （）
