Abstract
Three selected topics relevant for hypersonic problems shall be considered in this paper:
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Thermal chemistry of air dissociation on different levels: Thermodynamics and reaction kinetics of thermal air dissociation at high temperatures are now rather well known. Systematic sensitivity analysis leads to the conclusion that oxygen dissociation is the rate-limiting reaction.
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Non-thermal chemistry: Phenomena like vibrational relaxation lead to considerable complications. A mechanism is developed, taking into consideration vibrational-translational relaxation of nitrogen and oxygen molecules up to the dissociation limit. Results are presented and compared with that of a corresponding thermal mechanism.
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Coupling of flow and chemistry: Stiffness introduced by chemical reaction terms into the conservation equations demands for implicit solution procedures. The treatment of two-dimensional problems (Euler equations and Navier-Stokes equations) is described here to illustrate solution methods including detailed chemistry.
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Warnatz, J., Riedel, U., Schmidt, R. (1992). Different Levels of Air Dissociation Chemistry and Its Coupling with Flow Models. In: Bertin, J.J., Periaux, J., Ballmann, J. (eds) Advances in Hypersonics. Progress in Scientific Computing, vol 8/9. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-1-4612-0371-1_3
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DOI: https://doi.org/10.1007/978-1-4612-0371-1_3
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