Surface Heat Transfer Measurements by Lif in Reactive Flows

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Scientific paper

A study has been conducted to measure surface temperatures inside a model rectangular supersonic combustor using a non-intrusive thermal imaging system, based on the fluorescence properties of a dysprosium doped yttrium-aluminum-garnet (Dy3+ :YAG) thermographic phosphor. The wind tunnel was a blow-down type using vitiated air with nominal conditions at the entrance of the test section M∞=2.5, Po=5x105 N/m2 , To=800 K and Re∞/m=9.6x106 . Fuel was hydrogen gas at room temperature injected parallel to the tunnel through a fuel injector slit located along the backward surface of a step. The results under hot flow conditions were compared with numerical simulations performed using a 2-D Navier-Stokes code with full chemistry. Nomenclature h height of backward facing step L coating thickness M Mach number P pressure q heat flux Re Reynolds number T temperature t time x horizontal direction y vertical direction y* semi-infinity penetration depth κ thermal conductivity µ dynamic viscosity Subscripts and Superscripts ini initial o total condition sub substrate tsp temperature sensitive paint w wall x horizontal direction ∞ infinity

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