Vibrational-Chemical Coupling in mixtures CO 2 /CO/O and CO 2 /CO/O 2 /O/C

10th International Conference on Aerophysics and Physical Mechanics of Classical and Quantum Systems

物理学;力学

Kosareva, A.A.^1 ; Nagnibeda, E.A.^1

Saint-Petersburg State University, 7/9 Universitetskaya nab., St.Petersburg

199034, Russia^1

关键词: Governing equations;    Homogeneous mixtures;    Initial conditions;    Mixture compositions;    Temperature approximation;    Vibrational distribution;    Vibrational energies;    Vibrational temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/815/1/012027/pdf
DOI  :  10.1088/1742-6596/815/1/012027

学科分类：力学，机械学

来源: IOP

【 摘 要 】

The paper deals with modeling of vibration-chemical coupling in mixtures containing CO2molecules. The temporal vibrational and chemical relaxation in the five-component and three-component space-homogeneous mixtures CO2/CO/O2/C/O and CO2/CO/O is studied taking into account vibrational energy transitions, dissociation, recombination and exchange chemical reactions. The vibrational-chemical coupling in considered mixtures is studied on the basis of three-temperature, two-temperature and one-temperature vibrational CO2distributions. Governing equations for macroscopic mixture parameters in the three-temperature, two-temperature and one-temperature approximations are solved numerically for different initial conditions. Comparison of the results obtained in three approaches showed the in uence of non-equilibrium vibrational distributions on chemical reaction rates and on the temporal variation of the gas temperature, mixture composition and vibrational temperatures in two considered mixtures. The role of exchange chemical reactions in relaxation processes is also discussed in the paper.