TY - GEN

T1 - On the influence of kinetic models on parameters of CO2/CO/O2/O/C mixture flows behind shock waves

AU - Kosareva, Alena

AU - Nagnibeda, Ekaterina

PY - 2019/8/5

Y1 - 2019/8/5

N2 - The flows of CO2/CO/O2/O/C mixture in the relaxation zone behind shock waves are studied on the basis of the kinetic theory multi-temperature approaches taking into account vibrational and chemical non-equilibrium. The vibrational temperatures are introduced for the coupled (symmetric-bending) and asymmetric modes of CO2 as well as for diatomic species. Governing equations of the flow are written in the five-temperature approximation and solved numerically for different conditions in the free stream. Vibrational energy transitions, dissociation, recombination and exchange reactions are included to the kinetic scheme. The obtained results are compared with those found with the use of simplified three-temperature, two-temperature and one-temperature kinetic models. The influence of vibrational distributions on gas flow parameters and dissociation rates behind the shock front is shown. Along with the equilibrium conditions before the shock front the case of weakly non-equilibrium CO2 distributions in the free stream is also considered in calculations. The peculiarities of the results obtained for this case are discussed.

AB - The flows of CO2/CO/O2/O/C mixture in the relaxation zone behind shock waves are studied on the basis of the kinetic theory multi-temperature approaches taking into account vibrational and chemical non-equilibrium. The vibrational temperatures are introduced for the coupled (symmetric-bending) and asymmetric modes of CO2 as well as for diatomic species. Governing equations of the flow are written in the five-temperature approximation and solved numerically for different conditions in the free stream. Vibrational energy transitions, dissociation, recombination and exchange reactions are included to the kinetic scheme. The obtained results are compared with those found with the use of simplified three-temperature, two-temperature and one-temperature kinetic models. The influence of vibrational distributions on gas flow parameters and dissociation rates behind the shock front is shown. Along with the equilibrium conditions before the shock front the case of weakly non-equilibrium CO2 distributions in the free stream is also considered in calculations. The peculiarities of the results obtained for this case are discussed.

UR - https://aip.scitation.org/doi/abs/10.1063/1.5119621

M3 - Conference contribution

SN - 9780735118745

T3 - AIP Conference Proceedings

BT - 31st International Symposium on Rarefied Gas Dynamics

A2 - Zhang, Yonghao

A2 - Emerson, David R.

A2 - Lockerby, Duncan

PB - American Institute of Physics

Y2 - 23 July 2018 through 27 July 2018

ER -