Wall-cooling effect on linear stability of compressible streamwise corner-flow

The influence of constant wall temperatures on the compressible flow along a right-angled corner and its stability behaviour is investigated by temporal local linear stability analysis. Wall-cooling up to 90 % of the adiabatic wall-temperature for a subsonic flow (Ma = 0.95) is considered. The maximum cross-flow velocity along the corner bi-sector for the base flow with adiabatic wall boundary condition is higher than for the base flow with constant adabatic wall-temperature. For increasing wall temperature, the amplification rate of the viscous modes decreases to a lesser extent than that of the corner mode, therefore the critical Reynolds-number is further on defined by the first viscous mode. The spatial behaviour is displayed using N-factors computed from Gaster-transformed modes. (© 2016 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)