Journal
JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER
Volume 36, Issue 4, Pages 870-893Publisher
AMER INST AERONAUTICS ASTRONAUTICS
DOI: 10.2514/1.T6462
Keywords
-
Categories
Funding
- Air Force Office of Scientific Research
- Saint Petersburg State University [84912260]
Ask authors/readers for more resources
This study used solvers with varying model fidelity to model the high-temperature relaxation of air and the hypersonic flow over a cylinder. The results showed that uncertainties in vibrational relaxation times and reaction rate constants had a significant impact on thermal and chemical relaxation, particularly on gas temperature and species mole fractions.
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 6 km/s 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: N-2+O exchange and O-2+O dissociation in the former, and NO+O and O-2+N-2 dissociation in the latter.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available