Effects of heat transfer on transitional states of supersonic boundary layers
Résumé
Through high-resolution simulations, the present study aims to investigate several laminar-to-turbulent transition scenarios in the presence of wall-heat transfer for supersonic boundary layers over strongly heated/cooled and adiabatic flat plates. The laminar boundary layer is tripped using a suction and blowing technique with a single-frequency, multiple-spanwise wavenumber excitation. The results are evaluated and compared to linear stability theory in order to isolate the effect of wall-heat transfer, as well as forcing parameters, on the transition. It was found that increasing the disturbance amplitude as well as perturbation frequency moves the transition upstream. Also, the effect of wall heating was seen to stabilize the flow and to postpone the transition, contrary to the wall cooling.