Analysis of heat release rate in the partially premixed flame structures during autoignition of unstrained, laminar mixing layers

Inkant Awasthi, George Gogos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Autoignition in an unstrained, laminar mixing layer of methanol/air is investigated using detailed reaction mechanism and full multicomponent mass diffusion formulation. The temperature of the fuel stream is varied from 400 K to 1200 K, whereas the oxidizer stream is held at a fixed temperature of 1200 K. The calculations are performed for pressure p = 1 bar. Transient evolution of the autoignition kernel from initial partially premixed flame structures to final diffusion flame is demonstrated. The flame structures have been analysed for individual heat release rates. For equal fuel and oxidizer stream temperatures (1200 K), heat release in extremely fuel rich locations (with mixture fraction values up to 0.8) is found. A transient triple flame structure (two deflagrations and, one diffusion flame) is shown to exist even in cases when the temperature difference between the two streams is large. The heat release rates in the deflagrations depend on the temperatures of the two streams. When compared with the surviving diffusion flame, the heat release rate in the short-lived deflagrations is one to two orders of magnitude higher. It is shown that increasing the fuel stream temperature also decrease the ignition delay time in the mixing layer.

Original languageEnglish (US)
Title of host publicationASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
Pages393-403
Number of pages11
EditionPARTS A, B, C, D
DOIs
StatePublished - Dec 1 2012
EventASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012 - Houston, TX, United States
Duration: Nov 9 2012Nov 15 2012

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
NumberPARTS A, B, C, D
Volume7

Conference

ConferenceASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012
CountryUnited States
CityHouston, TX
Period11/9/1211/15/12

ASJC Scopus subject areas

  • Mechanical Engineering

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    Awasthi, I., & Gogos, G. (2012). Analysis of heat release rate in the partially premixed flame structures during autoignition of unstrained, laminar mixing layers. In ASME 2012 International Mechanical Engineering Congress and Exposition, IMECE 2012 (PARTS A, B, C, D ed., pp. 393-403). (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 7, No. PARTS A, B, C, D). https://doi.org/10.1115/IMECE2012-86162