ef6b02010_si_001.zip (89.45 kB)
Improved Kinetic Mechanism for Diethyl Ether Oxidation with a Reduced Model
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posted on 2017-02-28, 20:50 authored by Zhigang Tang, Li Zhang, Xi Chen, Gangzhi TangAn
improved diethyl ether (DEE) reaction mechanism consisting of
174 species and 973 reactions has been proposed. The present model
is derived from an original model of Yasunaga et al. [Yasunaga, K.; Gillespie, F.; Simmie, J. M.; Curran, H. J.; Kuraguchi, Y.; Hoshikawa, H.; Yamane, M.; Hidaka, Y. A multiple shock tube and chemical
kinetic modeling study of diethyl ether pyrolysis and oxidation. J. Phys. Chem. A 2010, 114 (34), 9098−9109, DOI: 10.1021/jp104070a]. On the basis of shock tube
results in the temperature range of 900–1900 K, pressure range
of 1–40 bar, and equivalence ratios of 0.5–2 as well
as rapid compression machine (RCM) measurements of a stoichiometric
DEE/O2/inert gas mixture at temperatures of 500–900
K and pressures of 3–4 bar, the ignition delay times (IDTs)
were validated. Two-stage ignition at temperatures below 650 K and
negative temperature coefficient (NTC) behavior at temperatures between
621 and 746 K are observed. In addition, the freely propagating flame
velocities of a stoichiometric DEE/air mixture were validated at various
temperatures as well. Using directed relation graph (DRG)-based methods
for the improved mechanism reduction, a reduced mechanism composed
of 80 species and 329 reactions has been achieved. Calculations for
IDTs, laminar flame velocities, and temperature and species profiles
using the reduced mechanism show very close agreement with those obtained
using the improved mechanism. Meanwhile, sensitivity analyses of the
burning velocity and IDT for the improved and reduced mechanisms were
performed. Competing reactions related to DEE + OH and consumption
of C2H5OC2H4s and HO2 were identified as being important for IDTs at various temperatures.
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equivalence ratiossensitivity analysesHO 2DRGdiethyl ether pyrolysisshock tubetemperature coefficientOHdiethyl ether329 reactionsC 2 H 5 OC 2 H 4DEEDiethyl Ether Oxidationreaction mechanismpropagating flame velocities650 Ktemperature rangerelation graphDOIIDTKinetic Mechanism80 speciesReduced Model973 reactionsshock tube resultsNTCmechanism showRCMlaminar flame velocitiesspecies profilescompression machine746 Kignition delay times174 speciesmechanism reductiongas mixturepressure rangemodeling studyvelocityTwo-stage ignition
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