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Autoignition processes are of fundamental kinetic importance as well as of practical relevance for combustion devices. In recent years, diethyl ether (DEE) has attracted increasing attention as a diesel additive and also serves as a test compound in fire-safety-related studies. In the present work, a kinetically parameterized reaction mechanism for the autoignition of DEE is developed. It consists of a DEE-specific part supplemented by a base mechanism taken from the literature that contains the C 1 /C 2  hydrocarbon and the H 2 /O 2  reaction systems. The complete mechanism is validated against experimental ignition delay times available from the literature for temperatures ranging from 500 to 1300 K and reactant pressures between 3 and 5 bar ( T =500−900 K) and between 10 and 40 bar ( T =900−1300 K). The absolute values and the temperature dependence of the ignition delay times are satisfactorily reproduced. This includes important autoignition characteristics such as one- and two-stage ignitions and the so-called negative temperature coefficient regime where ignition delay times increase with temperature. Detailed kinetic-mechanistic explanations for all these phenomena are given.

Low-Temperature Autoignition of Diethyl Ether/O 2 Mixtures: Mechanistic Considerations and Kinetic Modeling