Numerical study on autoignited and non-autoignited lifted flames of methane in coflow jets at elevated temperatures

Saeed Al-Noman, Sangkyu Choi, Suk Ho Chung*

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

Abstract

The characteristics of autoignited and non-autoignited laminar lifted flames of methane fuel in high-temperature coflow air have been studied numerically. By varying the initial temperature and fuel mole fraction, three regimes were investigated. At relatively low initial temperature (i.e. T 0 = 800 K), non-autoignited nozzle-attached flame was simulated at relatively low jet velocity and the result successfully reproduced previous experimental data. At higher initial temperature, two regimes were investigated: autoignited lifted flame with tribrachial-edge structure and autoignited lifted flame with mild combustion. The mild combustion regime existed for excessively diluted methane fuel with nitrogen. The chemical kinetics for the autoignition process was discussed. The local equilibrium temperature concept was adopted in explaining the mild combustion regime. Transition behavior from mild combustion regime to nozzle-attached flame was elucidated. As the fuel mole fraction increased, the maximum flame temperature increased while the flame lift-off height decreased reasonably linearly which resulted from the reactivity enhancement.

Original languageEnglish (US)
StatePublished - Jan 1 2013
Event9th Asia-Pacific Conference on Combustion, ASPACC 2013 - Gyeongju, Korea, Republic of
Duration: May 19 2013May 22 2013

Other

Other9th Asia-Pacific Conference on Combustion, ASPACC 2013
CountryKorea, Republic of
CityGyeongju
Period05/19/1305/22/13

ASJC Scopus subject areas

  • Environmental Engineering

Fingerprint

Dive into the research topics of 'Numerical study on autoignited and non-autoignited lifted flames of methane in coflow jets at elevated temperatures'. Together they form a unique fingerprint.

Cite this