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• W2906405979 abstract "Experimental and computational investigation is carried out to elucidate the influence of stoichiometric mixture fraction, ξst, on the structure and critical conditions of extinction of nonpremixed dimethyl ether (DME) flames. The stoichiometric mixture fraction represents the location of a thin reaction zone in terms of a conserved scalar quantity. The counterflow configuration is employed, wherein two reactant streams flow towards a stagnation plane. One stream is made up of DME and nitrogen (N2) and the other stream is oxygen and N2. Previous studies have shown that critical conditions of extinction depend on ξst and the adiabatic temperature Tst. Therefore, the present investigation is carried out with the composition of the reactants in the counterflowing streams so chosen that the adiabatic temperature is the same for different values of ξst. The strain rate at extinction, aq, is measured for values of ξst up to 0.8. Computations are performed using detailed kinetic mechanisms and critical conditions of extinction and flame structures are predicted. The measurements and predictions show that, with increasing ξst, the strain rate at extinction first decreases and then increases. The predictions agree with measurements for ξst<0.4, but significant deviations between measurements and predictions are observed at higher values of ξst. The scalar dissipation rate at extinction, χst,q is calculated using measured and predicted values of aq. With increasing ξst, the measured and predicted values of χst,q first increase and then decrease. It is noteworthy that changes in values of χst,q with ξst for dimethyl ether flames are similar to those for methane flames, while the changes in values of aq with ξst are remarkably different. Flame structures are predicted and they are found to be qualitatively similar to those for hydrocarbon fuels." @default.
• W2906405979 created "2019-01-01" @default.
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• W2906405979 date "2018-12-20" @default.
• W2906405979 modified "2023-09-26" @default.
• W2906405979 title "Experimental and computational investigation of the influence of stoichiometric mixture fraction on structure and extinction of laminar, nonpremixed dimethyl ether flames" @default.
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• W2906405979 doi "https://doi.org/10.1080/13647830.2018.1551577" @default.
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