Experimental and computational study of non-premixed ignition of dimethyl ether in counterflow

X. L. Zheng, T. F. Lu, C. K. Law, C. K. Westbrook

Research output: Contribution to conferencePaper

1 Scopus citations

Abstract

The ignition temperature of nitrogen-diluted dimethyl ether (DME) by heated air in counterflow was experimentally determined for DME concentration from 5.9 to 30%, system pressure from 1.5 to 3 atmospheres, and pressure-weighted strain rate from 110 to 170/sec. Sensitivity analysis for the near-ignition state based on both mechanisms identified the deficiencies of the 1998-mechanism, particularly the specifics of the low-temperature cool flame chemistry in effecting ignition at higher temperatures, as the fuel stream is progressively heated from its cold boundary to the high-temperature ignition region around the hot-stream boundary. The 2003-mechanism, consisting of 79 species and 398 elementary reactions, was systematically simplified by using the directed relation graph method to a skeletal mechanism of 49 species and 251 elementary reactions, which in turn was further simplified by using computational singular perturbation method and quasi-steady-state species assumption to a reduced mechanism consisting of 33 species and 28 lumped reactions. Both the skeletal and reduced mechanisms mimicked the performance of the detailed mechanism with high accuracy.

Original languageEnglish (US)
Number of pages1
StatePublished - Jan 1 2004
Event30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

Other

Other30th International Symposium on Combustion, Abstracts of Symposium Papers
CountryUnited States
CityChicago, IL
Period7/25/047/30/04

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Zheng, X. L., Lu, T. F., Law, C. K., & Westbrook, C. K. (2004). Experimental and computational study of non-premixed ignition of dimethyl ether in counterflow. Paper presented at 30th International Symposium on Combustion, Abstracts of Symposium Papers, Chicago, IL, United States.