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Photoionization mass spectrometry and modeling studies of the chemistry of fuel-rich dimethyl ether flames |
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| Authors: | Terrill A. Cool Juan Wang Phillip R. Westmoreland Zhenwei Zhao Tina Kasper |
| Affiliation: | a School of Applied and Engineering Physics, Cornell University, Ithaca, NY 14853, USA b Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94551, USA c Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003, USA d Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA e Physikalische Chemie I, Universität Bielefeld, D-33501 Bielefeld, Germany |
| Abstract: | Reaction paths are identified for dimethyl ether (DME) combustion using modeling of new data from fuel-rich DME flat flames. A molecular-beam flame-sampling photoionization mass spectrometer, employing VUV synchrotron radiation, is applied to the measurement of mole fractions for 21 flame species in low-pressure premixed fuel-rich (Φ = 1.2, 1.68) DME/oxygen/argon flat flames. This approach is capable of resolving and identifying isomers and other flame species of near equal masses with ionization thresholds that differ by as little as 0.1 eV. The measurements agree well with flame modeling predictions, using a recently revised high-temperature DME kinetic mechanism, which identify reaction paths quite analogous to alkane combustion. They further reveal the presence of ethyl methyl ether, a molecule previously unobserved in flames and not included in present flame models. |
| Keywords: | Dimethyl ether Kinetics Molecular-beam mass spectrometry Flames Photoionization |
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