Measurements of ignition delay times and OH species concentrations in DME/O2/Ar mixtures
Oxygenated fuels are becoming increasingly important in combustion applications. In diesel engines, oxygenate additives have demonstrated some potential to reduce soot emissions, which are a major barrier to expanding the use of diesel engines . In addition, biofuels contain many oxygenated species, further motivating the study of detailed oxygenate chemistry. Dimethyl ether (DME) is an attractive fuel to study because it is a simple oxygenate with a good experimental and modeling database [2-7]. Two types of measurements are presented in this study: ignition delay times, and OH time-histories. Ignition delay times provide useful targets for evaluating the overall performance of detailed oxidation mechanisms and providing direct comparisons with past work. In very rich mixtures, however, there is no distinct ignition event, so OH profiles can be used instead.
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