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Diffusive-Thermal Instability and Buoyancy-Driven Instability in Laminar Attached Free-jet Flames with DC Electric Fields  

Han, Jong-Kyu (부경대학교 기계공학과)
Yoon, Sung-Hwan (부경대학교 친환경수송시스템연구소)
Park, Jeong (부경대학교 기계공학과)
Yun, Jin-Han (한국기계연구원 그린환경에너지기계본부)
Gil, Sang-In (한국기계연구원 그린환경에너지기계본부)
Seo, Sang-Il (한국전력연구원 수화력발젼팀)
Kim, Young-Ju (한국전력연구원 수화력발젼팀)
Publication Information
Journal of the Korean Society of Combustion / v.16, no.3, 2011 , pp. 41-51 More about this Journal
Abstract
In this paper, we describe the behavior of two self-excitations in laminar attached free-jet flames under the influence of DC electric fields, one of buoyancy-driven and the other of diffusion-thermal instability, established from the horizontal and vertical injection. In the horizontal injection with removed buoyancy effect, oscillating flames with the frequency of 1.3 - 7.4 Hz were observed in a certain condition with Lewis number more than unity. On the other hand, it was appeared Lewis number induced self-excitation as well as buoyancy-driven self-excitation in the vertical upward injection with DC electric fields. This behavior had frequency range of 1.6 - 9.4 Hz and was exhibited to attribute the buoyancy effect. Finally, a well-defined division about two self-excitations having similar frequency range is briefly discussed.
Keywords
Buoyancy-driven instability; Diffusive-thermal instability; Electric fields; Oscillation;
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