Thermochemical nonequilibrium effects on high-enthalpy double-wedge flows

A hypersonic laminar flow over double wedges with a fixed forward angle of 15° and varied aft angles is studied using computational fluid dynamics global stability analysis (GSA) at free-stream Mach number 12.82 total enthalpy 21.77 MJ/kg. The specific high enough to trigger evident vibrational excitation air chemistry. To assess the effects thermal chemical nonequilibrium, three different thermochemistry models are considered, including frozen, thermochemical nonequilibrium gases. Two-dimensional base-flow simulations indicate that onset incipient secondary separation insensitive inclusion thermochemistry, although size region substantially reduced. GSA then performed on base flows identifies three-dimensional stationary instability beyond critical angle, which also nonequilibrium. criterion boundary established for supersonic compression corners in calorically perfect gas terms scaled deflection [Hao et al., “Occurrence corner flow,” J. Fluid Mech. 919, A4 (2021)] is, thus, extended high-enthalpy conditions.