GORTLER-TYPE VORTICES IN HYPERSONIC FLOWS - THE RAMP PROBLEM

This paper deals with the wall heat flux measurements in the presence of thermal striations that can occur in the reattaching how after a Ma ch 7.1 shock wave-boundary layer interaction on a 15 degrees flap. Two different experimental techniques were used: thin skin with thermocou ples and thin film with infrared thermography. Special care was taken to correct the lateral conduction effects. They can be important becau se of the small wavelengths of the spanwise striations. The influence of the Reynolds number was assessed by varying the unit Reynolds numbe r and the length of the flat plate while keeping the same leading edge geometry. The effect of a sinusoidal perturbation at the leading edge also was studied. Finally, Navier Stokes laminar computations were pe rformed to obtain the proper level of the laminar heat flux and to ana lyze the effect of the leading edge thickness. The calculations confir m the strong influence of the leading edge on the interaction phenomen a. (C) Elsevier Science Inc., 1997.