Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6679246 | Proceedings of the Combustion Institute | 2015 | 8 Pages |
Abstract
Ignition delay times of diethyl ether (DEE)/air/argon mixtures were studied in a shock tube in the temperature range from 900 to 1300Â K at pressures of 10, 20, and 40Â bar and in a rapid compression machine (RCM) at various equivalence ratios between 500 and 1060Â K at pressures between 2.5 and 13Â bar. Between 2.5 and 5.5Â bar, the RCM results show that ignition delay times of DEE exhibit a region (between 590 and 800Â K) where ignition delay times are weakly temperature dependent only, while above 833Â K and below 590Â K, the ignition delay times are strongly temperature dependent. Two-stage ignition was observed in the temperature range from 500 to 665Â K in the RCM measurements. At the conditions of the shock tube, a strong pressure and temperature dependence of the ignition delay times was observed, but no non-thermal (NTC) behavior was found in the investigated temperature range. Simulations based on detailed chemistry using the mechanism of Yasunaga et al. (2010) [15] indicate that at high pressures ignition delay times show a high sensitivity towards the two H-atom abstraction reactions by HO2 from diethyl ether. By increasing the rate coefficients of these two reactions relative to the original values by a factor of five, the mechanism well describes our measurements and still well reproduces the original data of Yasunaga et al. (2010) [15].
Related Topics
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Authors
M. Werler, L.R. Cancino, R. Schiessl, U. Maas, C. Schulz, M. Fikri,