Experimental and Numerical Study on Transpiration Cooling with Supersonic Flow

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Kurzfassung

For the present study the ITLR supersonic combustion experimental facility was used to investigate the transpiration cooling efficiency of C/C materials. The tested sample had a porosity of 16.1% and was exposed to supersonic (M=2.1) flow conditions at moderate total temperature levels of the main flow up to T_t,g=600 K. The surface temperature of the C/C material was measured with thermocouples. These experimental data were used, to validate two commercial CFD codes. Two dimensional computations with FLUENT 6.3 and CFD-ACE v.2009 were conducted using user-defined subroutines for the computation of the cooling mechanisms within the porous sample. The first approach features two energy-equations (fluid and solid) coupled with an empirical heat transfer coefficient enabling the computation of thermal non-equilibrium locally in the sample. The blowing at the porous material’s surface is then simulated by source terms, which are also linked to the thermal computations within the wall. The second method follows a strongly coupled approach and accounts also for the mass and momentum transport in the porous medium. Instead of applying source terms at the porous-fluidic interface, the discretization scheme was adapted locally in order to account for the discontinuities occurring at the interface.

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• Experimental and Numerical Study on Transpiration Cooling with Supersonic Flow. (deposited 03 Dez 2009 10:38) [Gegenwärtig angezeigt]