Computational and Experimental Studies of Jet Fuel Combustion
Final rept. 15 Nov 2005-14 May 2009
YALE UNIV NEW HAVEN CT DEPT OF MECHANICAL ENGINEERING
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An experimental and computational study was completed on the structure of two sets of flames a nonsooting CH4 counterflow diffusion flame doped with 1000 ppm of either jet fuel or a 6-component surrogate and a well-defined baseline C2H4 flame under incipient sooting conditions perturbed with the addition of 2000 ppm by mole of either jet fuel or two surrogates, a 6-component UtahYale blend and a two-component Aachen surrogate. Gas samples were extracted from the flame with quartz microprobes for subsequent GCMS analysis. Profiles of critical fuel decomposition products and soot precursors, such as benzene and toluene, were compared. The data for C7-C12 alkanes were consistent with typical decomposition of large alkanes with both surrogates showing good qualitative agreement with jet fuel in their pyrolysis trends. Olefins were formed as the fuel alkanes decomposed, with agreement between the surrogates and jet fuel improved for small alkenes. Good agreement between jet fuel and the surrogates was found with respect to critical soot precursors such as benzene and toluene. Although the 6-component UtahYale surrogate performed better than the Aachen surrogate, the latter performed adequately and retained the advantage of simplicity, since it consisted of only two components. Additional work focused on the development of a domain decomposition parallel solution methodology for coflow diffusion flames.
- Combustion and Ignition