THERMAL SCIENCE

International Scientific Journal

Babak Kashir

,

Sadegh Tabejamaat

,

Mohammadreza Baig Mohammadi

AN EXPERIMENTAL STUDY OF THE STABILITY OF NATURAL GAS AND PROPANE TURBULENT NON-PREMIXED FLAME UNDER DILUTING CONDITION

ABSTRACT
The stability behavior of a jet diffusion flame developing in a co-flowing stream is studied experimentally, using natural gas and propane as fuel gases. Effects of oxidant and fuel stream velocities and oxidant stream dilution have been studied. The results of experiments showed that with increasing fuel jet Reynolds number, there appears along the flame a point that is accompanied by reaction zone sudden expansion. Flame becomes turbulent downstream from this point. This point is called transition point. More increment of fuel jet Reynolds number moves the transition point to the upstream. Furthermore, two types of stability limits are observed. Blow-off of the rim-stabilized flame is the first stability limit. The second one is the break-off or extinction of the turbulent portion of the flame at the transition point from laminar to turbulent flow. The oxidant and fuel streams are in environmental temperature. In dilution experiments, the oxidant primary stream is oxygen that is diluted with nitrogen or carbon dioxide. In the other experiments oxidant is environmental air.
KEYWORDS
experimental, stability, turbulent, non-premixed flame, diluting
PAPER SUBMITTED: 2011-06-17
PAPER REVISED: 2011-06-25
PAPER ACCEPTED: 2011-09-02
DOI REFERENCE: https://doi.org/10.2298/TSCI110617125K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2012, VOLUME 16, ISSUE Issue 4, PAGES [1055 - 1065]
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An experimental study of the stability of natural gas and propane turbulent non-premixed flame under diluting condition

© 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