THERMAL SCIENCE

International Scientific Journal

Zouhair Riahi

,

Mohamed Ali Mergheni

,

Jean-Charles Sautet

,

Sassi Ben Nasrallah

NUMERICAL STUDY OF TURBULENT NORMAL DIFFUSION FLAME CH4-AIR STABILIZED BY COAXIAL BURNER

ABSTRACT
The practical combustion systems such as combustion furnaces, gas turbine, engines, etc. employ non-premixed combustion due to its better flame stability, safety, and wide operating range as compared to premixed combustion. The present numerical study characterizes the turbulent flame of methane-air in a coaxial burner in order to determine the effect of airflow on the distribution of temperature, on gas consumption and on the emission of NOx. The results in this study are obtained by simulation on FLUENT code. The results demonstrate the influence of different parameters on the flame structure, temperature distribution and gas emissions, such as turbulence, fuel jet velocity, air jet velocity, equivalence ratio and mixture fraction. The lift-off height for a fixed fuel jet velocity is observed to increase monotonically with air jet velocity. Temperature and NOx emission decrease of important values with the equivalence ratio, it is maximum about the unity.
KEYWORDS
non-premixed combustion, coaxial burner, turbulent flame, lift-off height, equivalence ratio, mixture fraction, NOx emission
PAPER SUBMITTED: 2011-06-09
PAPER REVISED: 2012-02-18
PAPER ACCEPTED: 2012-03-11
DOI REFERENCE: https://doi.org/10.2298/TSCI110609042R
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2013, VOLUME 17, ISSUE Issue 4, PAGES [1207 - 1219]
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Numerical study of turbulent normal diffusion flame CH4-air stabilized by coaxial burner

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence