Showerhead Film Cooling Performance of a Turbine Vane at High Freestream Turbulence in a Transonic Cascade

Thispaperexperimentallyinvestigatestheeffectof� blowingratioandexitReynoldsnumber/Machnumberonthe� filmcoolingperformanceofashowerheadfilmcooledfirst� stageturbinevane.�Thevanemidspanwasinstrumentedwith� single&sidedplatinumthinfilmgaugestoexperimentally� characterizetheNusseltnumberandfilmcoolingeffectiveness� distributionsoverthesurface.�Thevanewasarrangedinatwo& dimensional,�linearcascadeinaheated,�transonic,�blow&down� windtunnel.�ThreedifferentexitMachnumbersofM ex�=�0.57,� 0.76�and�1.0—correspondingtoexitReynoldsnumbersbased� onvanechordof� 9.7� x� 10