TY - CONF
T1 - Experimental and computational study of non-premixed ignition of dimethyl ether in counterflow
AU - Zheng, X. L.
AU - Lu, T. F.
AU - Law, C. K.
AU - Westbrook, C. K.
N1 - Funding Information:
This work at Princeton University was supported by the Army Research Office under the technical monitoring of Dr. D. Mann and by the Air Force Office of Scientific Research under the technical monitoring of Dr. Julian M. Tishkoff. The work at the Lawrence Livermore National Laboratory was carried out under the auspices of the U.S. Department of Energy under Contract No. W-7405-ENG-48, and was supported by the DOE Office of Transportation Technologies, Gurpreet Singh and John Garbak, program managers.
PY - 2004
Y1 - 2004
N2 - The ignition temperature of nitrogen-diluted dimethyl ether (DME) by heated air in counterflow was experimentally determined for DME concentration from 5.9 to 30%, system pressure from 1.5 to 3 atmospheres, and pressure-weighted strain rate from 110 to 170/sec. Sensitivity analysis for the near-ignition state based on both mechanisms identified the deficiencies of the 1998-mechanism, particularly the specifics of the low-temperature cool flame chemistry in effecting ignition at higher temperatures, as the fuel stream is progressively heated from its cold boundary to the high-temperature ignition region around the hot-stream boundary. The 2003-mechanism, consisting of 79 species and 398 elementary reactions, was systematically simplified by using the directed relation graph method to a skeletal mechanism of 49 species and 251 elementary reactions, which in turn was further simplified by using computational singular perturbation method and quasi-steady-state species assumption to a reduced mechanism consisting of 33 species and 28 lumped reactions. Both the skeletal and reduced mechanisms mimicked the performance of the detailed mechanism with high accuracy.
AB - The ignition temperature of nitrogen-diluted dimethyl ether (DME) by heated air in counterflow was experimentally determined for DME concentration from 5.9 to 30%, system pressure from 1.5 to 3 atmospheres, and pressure-weighted strain rate from 110 to 170/sec. Sensitivity analysis for the near-ignition state based on both mechanisms identified the deficiencies of the 1998-mechanism, particularly the specifics of the low-temperature cool flame chemistry in effecting ignition at higher temperatures, as the fuel stream is progressively heated from its cold boundary to the high-temperature ignition region around the hot-stream boundary. The 2003-mechanism, consisting of 79 species and 398 elementary reactions, was systematically simplified by using the directed relation graph method to a skeletal mechanism of 49 species and 251 elementary reactions, which in turn was further simplified by using computational singular perturbation method and quasi-steady-state species assumption to a reduced mechanism consisting of 33 species and 28 lumped reactions. Both the skeletal and reduced mechanisms mimicked the performance of the detailed mechanism with high accuracy.
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M3 - Paper
AN - SCOPUS:10344228774
SP - 64
T2 - 30th International Symposium on Combustion, Abstracts of Symposium Papers
Y2 - 25 July 2004 through 30 July 2004
ER -