Fully kinetic, vibrationally kinetic, and continuum solvers with varying model fidelity are used in this work to model the high-temperature relaxation of air in 7230 and 15,000 K adiabatic heat baths and a hypersonic flow over a cylinder. The results show significant impact of uncertainties in vibrational relaxation times and reaction rate constants on thermal and chemical relaxation, in particular, on gas temperature and species mole fractions. Most notably, these uncertainties need to be reduced for collisions that include nitric oxide. Order-of-magnitude differences in the nitric oxide dissociation and recombination rates have a large impact on the peak NO mole fraction immediately behind the shock and surface-distributed heat flux, respectively. High-fidelity kinetic and continuum approaches are found to have different reaction channels having the largest effect on species mole fractions and gas temperature: exchange and dissociation in the former, and and dissociation in the latter.
Kinetic and Continuum Modeling of High-Temperature Air Relaxation
Journal of Thermophysics and Heat Transfer ; 36 , 4 ; 870-893
2022-02-21
24 pages
Article (Journal)
Electronic Resource
English
Multiple Temperature Kinetic Model for Continuum and Near Continuum Flows AIAA Paper
British Library Conference Proceedings | 2007
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