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This postprint is also in the postprint series of the following research unit(s):

• Combustion Processes Laboratories

ABSTRACT:
Despite the rapid combustion typically experienced in Homogeneous Charge Compression Ignition (HCCI), components in fuel mixtures do not ignite in unison or burn equally. In our experiments and modeling of blends of diethyl ether (DEE) and ethanol (EtOH), the DEE led combustion and proceeded further toward completion, as indicated by 14C isotope tracing. A numerical model of HCCI combustion of DEE and EtOH mixtures supports the isotopic findings. Although both approaches lacked information on incompletely combusted intermediates plentiful in HCCI emissions, the numerical model and 14C tracing data agreed within the limitations of the single zone model. Despite the fact that DEE is more reactive than EtOH in HCCI engines, they are sufficiently similar that we did not observe a large elongation of energy release or significant reduction in inlet temperature required for light-off, both desired effects for the combustion event. This finding suggests that, in general, HCCI combustion of fuel blends may have preferential combustion of some of the blend components.

SUGGESTED CITATION:
John Hunter Mack, Daniel L. Flowers, Bruce A. Buchholz, and Robert W. Dibble, "Investigation of HCCI Combustion of Diethyl Ether and Ethanol Mixtures Using Carbon 14 Tracing and Numerical Simulations" (2004). Proceedings of the Combustion Institute. 30 (2), pp. 2693-2700. Postprint available free at: http://repositories.cdlib.org/postprints/759

REQUIRED PUBLISHER STATEMENT:
The original publication is available in the Proceedings of the Combustion Institute.