EXPERIMENTAL EVALUATION OF HEAT TRANSFER IN A HIGH TEMPERATURE HIGH PRESSURE TEST FACILITY

Performance of film cooling holes is generally evaluated ear ambient conditions, so scaling the film cooling performance from ambient to engine conditions is important. These performance metrics can be reported in terms of net heat reduction, heat transfer enhancement, and effectiveness. here are several challenges and penalties in conducting experiments on a real engine or even on a stationary flat plate,test article at near engine conditions. In this study, an experimental methodology capable of delivering film cooling performance for the experiments conducted in the high-temperature high-pressure test facility at NETL will be explored. More specifically, this study focuses on various challenges that are present and how these concerns are addressed to evaluate the heat transfer coefficient on the test particle. Steady state experiments were conducted on a flat plate,test article whose surface temperature distribution was obtained using an IR camera calibrated with a combination of top experiments and in-situ calibrations based on embedded thermocouple measurements. A detailed radiation analysis is conducted to enable differentiation of heat transfer convection from heat transfer by radiation. The estimated surface heatflux and heat transfer coefficient were found to be higher than the one obtained from flat plate correlation.