Heat flux and coolant concentration in hypersonic turbulent flow with transpiration cooling

This is an accepted manuscript of a paper presented at the 17th UK Heat Transfer Conference, University of Manchester. available online at: http://cfd.mace.manchester.ac.uk/ukhtc21-proc/download.php The accepted manuscript of the publication may differ from the final published version.The present contribution shows results from direct numerical simulations (DNS) of a Mach 5 turbulent flow on a flat plate with modelled porous injection at different blowing ratios, representative of a transpiration-cooling system. It is found that the coolant film on the surface is preserved within the calmed region, whereas in the turbulent wedge it decays as a consequence of the wall-normal convective transport. This, in turn, results in the beneficial effect of the blowing ratio on the wall heat flux being relevant within the transitional region, but almost negligible within the turbulent wedge