TED-AJ03-246 A Transient Experimental Technique for High Velocity Jet Impingement Heat Transfer Using Temperature Sensitive Liquid Crystals

概要

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An experimental technique for investigation of jet impingement cooling of a hypersonic airfoil leading edge is developed. Temperature sensitive liquid crystals are used to measure surface temperature during a transient experiment. The experiment uses a computer based data acquisition system with a digital camera to image the liquid crystals and record the time to color transition. The recovery factor of the jet is accounted for by running two experiments with different jet heating rates, thereby generating a second equation that is used to solve for the recovery factor. The data reduction relies on numerical analysis of the coupled, transient, conduction-convection heat transfer problem that characterizes the experiment. Special attention is paid to error assessment and considers both random and systematic errors generated by the instrumentation along with errors generated by the instrumentation along with errors generated by the approximate nature of the numerical methods used in solving the inverse heat transfer problem. Results of the error analysis show that the experimentally determined heat transfer coefficients are accurate to within 13%. Parameters that were investigated include nozzle width, distance from the nozzle exit plane to the inner surface of the airfoil, and jet velocity. Nusselt number and recovery factor data are presented for several configurations.
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