Abstract

Boundary layers at a zero pressure gradient in chemical non-equilibrium are considered for a five-species model of air in a total enthalpy range of 5 - 17MJ/kg. Comparisons with boundary layers in binary mixtures of oxygen reveal that the growth rates of the second mode are lower in the case of air. This result can be attributed to the lower wall temperatures in binary mixtures of oxygen due to dissociation, with the lower wall temperatures having a destabilizing effect on the second mode similar to the case of boundary layers in calorically perfect gases.

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