An ignition delay and kinetic modeling study of methane, dimethyl ether, and their mixtures at high pressures
Ultan Burke,Kieran P. Somers,Peter O’Toole,Chis M. Zinner,Nicolas Marquet,Gilles Bourque,Eric L. Petersen,Wayne K. Metcalfe,Zeynep Serinyel,Henry J. Curran +9 more
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TL;DR: In this article, both experimental and chemical kinetic model-predicted ignition delay time data are provided covering a range of conditions relevant to gas turbine environments (T = 600-1600 K, p = 7-41 K, ϕ ǫ = 0.3, 0.5, 1.0, and 2.0 in ‘air’ mixtures).
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About: This article is published in Combustion and Flame. The article was published on 01 Feb 2015. and is currently open access. The article focuses on the topics: Ignition system & Flame speed.
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Figures
Table 3: CH4/DME mixture compositions (% molar volume) tested in the present study. 
Figure 11: Influence of equivalence ratio for 80/20 CH4/DME mixtures. – φ = 0.3, • – φ = 0.5, N – φ = 1.0, H – φ = 2.0. Open symbols are RCM data, filled symbols ST data. Lines are Mech 56.54 predictions. 
Figure 12: Sensitivity analyses for ignition delay times at p = 10 atm and at – φ = 2.0, – φ = 1.0, – φ = 0.5. 
Table 5: Low-temperature DME reactions treated as pressure dependent. CH3O . CH2 . CH3 + CH2O 
Figure 7: Influence of equivalence ratio on CH4 mixtures at – φ = 0.3, • – φ = 0.5, N – φ = 1.0, H – φ = 2.0. Open symbols are RCM data, filled symbols ST data, half-filled symbols are tailored-interface ST data. Lines are Mech 56.54 predictions. 
Figure 16: Sensitivity analysis at 827 K and φ = 0.50 at – 12.4 atm, – 24.7 atm.
Citations
Dimethyl ether (DME) and dimethoxymethane (DMM) as reaction enhancers for methane: Combining flame experiments with model-assisted exploration of a polygeneration process
Hao Zhang,Hao Zhang,Wei Tang,Dennis Kaczmarek,Charlotte Rudolph,Steffen Schmitt,Nina Gaiser,Patrick Oßwald,Thomas Bierkandt,Tina Kasper,Burak Atakan,Katharina Kohse-Höinghaus +11 more
TL;DR: In this article, the potential of dimethyl ether (DME) and dimethoxymethane (DMM), representatives of the attractive oxymethylene ether (OME) alternative fuel family, are explored as reactivity enhancers for methane-fueled polygeneration processes.
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H Radical Sensitivity-Assisted Automatic Chemical Kinetic Model Reduction for Laminar Flame Chemistry Retaining: A Case Study of Gasoline–DME Mixture under Engine Conditions
TL;DR: In this article, an improved automatic reduction scheme is proposed by adding a normalized H radical sensitivity with rate constants, which can be more accurate to construct the species group relevant to laminar flame chemistry.
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Autoignited lifted flames of dimethyl ether in heated coflow air
TL;DR: In this paper, a planar laser-induced fluorescence (PLIF) technique for formaldehyde (CH2O) visualized qualitatively the zone of low temperature kinetics in a premixed flame.
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Ignition Delay Characteristics and Kinetic Investigation of Dimethyl Ether/n-Pentane Binary Mixtures: Interpreting the Effect of the Equivalence Ratio and Dimethyl Ether Blending
TL;DR: In this paper, the autoignition delays of DME-enriched n-pentane mixtures were measured at equivalence ratios of 0.5-2.0, pressure of 20 atm, and temperatures of 1100-1600 K using a shock tube.
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