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http://dx.doi.org/10.15231/jksc.2015.20.1.043

A Study on Self-excitation in Laminar Lifted Coflow-jet Flames  

Van, Kyu Ho (Department of Mechanical Engineering, Pukyoung National University)
Lee, Won June (Department of Mechanical Engineering, Pukyoung National University)
Park, Jeong (Department of Mechanical Engineering, Pukyoung National University)
Kim, Tae Hyung (Power Generation Research Laboratory, Korea Electric Power Research Institute)
Park, Jong Ho (Department of Mechanical Engineering, Chungnam National University)
Publication Information
Journal of the Korean Society of Combustion / v.20, no.1, 2015 , pp. 43-51 More about this Journal
Abstract
A study on laminar jet flames in coflow air diluted with helium has been conducted to investigate self-excitations for various propane mole fractions and nozzle exit velocities. The stability map was represented as a function of nozzle exit velocity and fuel mole fraction for propane. The results show that two types of self-excitation were observed : (1) buoyancy-driven self-excitation (hereafter called BDSE) and (2) Lewis-number induced-self-excitation coupled with (1) (hereafter called LCB) near extinction limit for 9.4 mm nozzle diameter. It was shown that with 0.95 mm nozzle diameter, Lewis-number-induced self-excitation (hereafter LISE) and BDSE could be separated. The differences between the two self-excitations were shown and discussed.
Keywords
Buoyancy driven self-excitation; Lewis-number induced self-excitation; Damk $\ddot{o}$hler number; Lewis number;
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