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http://dx.doi.org/10.15231/jksc.2014.19.2.021

Experimental Study on Comparison between Buoyancy Driven and Lewis Number Induced Self-excitations in Laminar Lifted Coflow-jet Flames  

Lee, Won June (Department of Interdisciplinary Program of Marine-Bio, Electrical & Mechanical Engineering, Pukyong National University)
Park, Jeong (Department of Mechanical Engineering, Pukyong National University)
Kwon, Oh Boong (Department of Mechanical Engineering, Pukyong National University)
Yun, Jin Han (Environment & Energy Research Division, Korea Institute of Machinery and Materials)
Keel, Sang In (Environment & Energy Research Division, Korea Institute of Machinery and Materials)
Publication Information
Journal of the Korean Society of Combustion / v.19, no.2, 2014 , pp. 21-27 More about this Journal
Abstract
Experimental study in laminar propane coflow jet flames has been conducted to investigate self-excitations. For various propane mole fractions and jet velocities, two types of self-excitation were observed: (1) buoyancydriven self-excitation (hereafter called BDSE) and (2) Lewis-number-induced self-excitation coupled with (1) (hereafter called LCB). The mechanism of Lewis-number-induced self-excitation (hereafter called LISE) is proposed. When the system $Damk\ddot{o}hler$ number was lowered, LISE was shown to be launched. The LISE is closely related to heat loss, such that it can be launched in even helium-diluted methane coflow-jet flame (Lewis number less than unity). Particularly, The LISE becomes significant as the $Damk\ddot{o}hler$ number decreases and heat-loss is excessively large.
Keywords
Buoyancy driven self-excitation; $Damk\ddot{o}hler$ number; Heat loss induced self-excitation; Lewis number; Lewis number induced self-excitation;
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