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1 LEES - Laboratoire Energétique Explosions Structures 2 LVR - Laboratoire Vision & Robotique 3 PRISME - Laboratoire Pluridisciplinaire de Recherche en Ingénierie des Systèmes, Mécanique et Energétique 4 MBDA-F - MBDA

Abstract : The active cooling of the Supersonic Combustion Ramjet engine, for hypersonic flight purpose, is ensured thanks to fuel, n-dodecane for the present study. The endothermic fuel pyrolysis, starting above 800 K, could generate an unwanted coke formation. Experimental tests up to 1125 K and between 1 MPa and 6 MPa have been performed on the hydrocarbon fuel pyrolysis to evaluate the coking activity. 316L stainless steel, low carbon steel and titanium reactors have been considered. A witness of the coke formation, based on its thermal insulation and pressure loss effects, has been found. A correlation between methane production and coke deposit was found. The coke has been studied with Scanning Electron Microscope SEM, Energy Dispersion Spectroscopy EDS, X-ray diffractometer and Fourier Transform Infrared FTIR spectroscopy. The porosity, the density and the permeability of the coke have been estimated. © 2008 Elsevier B.V. All rights reserved.

Keywords : Carbon steel Chemical reactions Coke Combustion Electron energy loss spectroscopy Fourier transform infrared spectroscopy Fourier transforms Hydrocarbons Infrared spectroscopy Methane Organic compounds Petroleum chemistry Pyrolysis Ramjet engines Scanning electron microscopy Steel Thermal insulation Thermogravimetric analysis Titanium 316l stainless steels Active cooling Catalytic effect Characterisation Coke deposits Coke formations Dodecane Energy dispersions Experimental tests Fourier transform infrared Fuel pyrolysises Hydrocarbon fuels Hydrocarbon pyrolysis Hydrocarbon pyrolysises Hypersonic flights Low carbon steels Methane productions n-Dodecane Pressure losses Scanning electron microscopes Supercritical Supercritical state Supersonic combustion ramjet engines Stainless steel

Autor: Nicolas Gascoin - Philippe Gillard - Marc Bouchez -



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