Transpiration Cooling Computational Fluid Dynamics Submodel

This program focuses on the upgrade and validation of advanced turbulence models for the analysis of transpiration in high speed, aero-propulsive flows with and without combustion effects. A major upgrade involves the extension of scalar fluctuation models calibrated for fuel/air mixing to treat transpiration and thus predict near-wall variations of Prandtl and Schmidt numbers for varied injected species. New high speed transpiration data sets to support validation have been obtained and will be incorporated into an automated validation tool and analyzed. This data encompasses both fundamental cases (flat plate environment/no combustion) as well as more complex cases with shock/BL interactions and combustion of injected H2. Impact of transpiration on realistic scramjet flows will be assessed using available data sets for full-scale rectangular and inward-turning scramjet propulsive flowpaths, tested at hypersonic flight conditions without transpiration. New data sets for these propulsive flowpaths with transpiration will be obtained during the course of this program (in an independent effort) and they will be analyzed with the upgraded turbulence models. In addition, thermal balance modeling will be addressed and available models that can readily be integrated with the CFD codes and transpiration models utilized will be evaluated.