ASSESSMENT OF TURBULENCE AND CHEMISTRY MODELS FOR FILM-COOLED NOZZLE FLOWS

Systematic computation studies are conducted to show which physical ef fects are important and what physical models are required in high-spee d film-cooled nozzle flows, Compressibility effects in turbulence mode ls must be accounted for if shear layer spreading and wall heat fluxes are to be correctly predicted. Real gas effects are also quite signif icant, particularly as they account for widely varying thermochemical property variation because of large static temperature changes typical of nozzle flows.