TY - JOUR
T1 - Kinetic and Continuum Modeling of High-Temperature Air Relaxation
AU - Gimelshein, Sergey F.
AU - Wysong, Ingrid J.
AU - Fangman, Alexander J.
AU - Andrienko, Daniil A.
AU - Kunova, Olga V.
AU - Kustova, Elena V.
AU - Hanquist, Kyle M.
AU - Morgado, Fabio
AU - Garbacz, Catarina
AU - Fossati, Marco
N1 - Publisher Copyright:
© 2022 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
PY - 2022/10
Y1 - 2022/10
N2 - 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: N2 O exchange and O2 O dissociation in the former, and NO O and O2 N2 dissociation in the latter.
AB - 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: N2 O exchange and O2 O dissociation in the former, and NO O and O2 N2 dissociation in the latter.
UR - http://www.scopus.com/inward/record.url?scp=85133744914&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85133744914&partnerID=8YFLogxK
U2 - 10.2514/1.T6462
DO - 10.2514/1.T6462
M3 - Article
AN - SCOPUS:85133744914
SN - 0887-8722
VL - 36
SP - 870
EP - 893
JO - Journal of Thermophysics and Heat Transfer
JF - Journal of Thermophysics and Heat Transfer
IS - 4
ER -