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Foright at high Mach numbers, thermal and chemical nonequilibrium may exist in the meanow and thus affectthestabilityoftheow.Acomputationaltoolwasdevelopedtoanalyzeahypersonicmeanowanditsstability including thermochemical nonequilibrium. The meanow analysis employs the Navier± Stokes equations with a translational/vibrational temperature model for thermal nonequilibrium and a ® ve-species reacting air model for chemicalnonequilibrium. Thestability analysisemployslinearstability theory to describethespatialampli® cation of two- and three-dimensionaldisturbances. Thecomputational tool is used to determinethe frequency and spatial ampli® cation of disturbances that may lead to boundary layertransition on cold wall and adiabaticat plates. The effect of thermal and chemical nonequilibrium on stability is shown to depend on the disturbance mode.
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Hudson et al. (1997) studied this question.
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