THERMAL SCIENCE

International Scientific Journal

AN EXPERIMENTAL STUDY ON THE EFFECTS OF SWIRLING OXIDIZER FLOW AND DIAMETER OF FUEL NOZZLE ON BEHAVIOUR AND LIGHT EMITTANCE OF PROPANE-OXYGEN NON-PREMIXED FLAME

ABSTRACT
In this study, the stability and the light emittance of non-premixed propane-oxygen flames have been experimentally evaluated with respect to swirling oxidizer flow and variations in fuel nozzle diameter. Hence, three types of the vanes with the swirl angles of 30°, 45°, and 60° have been chosen for producing the desired swirling flows. The main aims of this study are to determine the flame behaviour, light emittance, and also considering the effect of variation in fuel nozzle diameter on combustion phenomena such as flame length, flame shape, and soot free length parameter. The investigation into the flame phenomenology was comprised of variations of the oxidizer and fuel flow velocities (respective Reynolds numbers) and the fuel nozzle diameter. The results showed that the swirl effect could change the flame luminosity and this way could reduce or increase the maximum value of the flame light emittance in the combustion zone. Therefore, investigation into the flame light emittance can give a good clue for studying the mixing quality of reactants, the flame phenomenology (blue flame or sooty flame, localized extinction), and the combustion intensity in non-premixed flames.
KEYWORDS
PAPER SUBMITTED: 2014-07-06
PAPER REVISED: 2015-07-28
PAPER ACCEPTED: 2015-11-22
PUBLISHED ONLINE: 2016-01-01
DOI REFERENCE: https://doi.org/10.2298/TSCI140706210J
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2017, VOLUME 21, ISSUE 3, PAGES [1453 - 1462]
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© 2017 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, 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