Aerothermal Aspects of a Pulsated Inclined Film Cooling Jet in Crossflow

†The present work is conducted to extend the experimental database for validation of an enhanced 3D film cooling model. This paper reports the simultaneous measurements of the pressure and temperature field of streamwise film cooling jet over a flat plate with 30° flow angle. Turbine representative operating conditions and geometry are studied. The main flow is heated at a temperature above the injected coolant to simulate a density ratio of 1.29, while the blowing ratio is maintained at average value of 2. The measurements are performed using a novel fast-response entropy probe, which enables the simultaneous measurement of time-resolved total temperature and pressure. These two measurements are then combined to obtain the kinetic energy loss coefficient and the entropy change, as well as the streamwise baroclinic vorticity production term. The effect of unsteadiness on the aerothermal field, aerothermal losses and baroclinic vorticity is documented. Pulsation is seen to increase the aerothermal losses and baroclinic vorticity production compared to a steady jet.