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Impact of the Flame-Holder Heat-Transfer Characteristics on the Onset of Combustion Instability

Author(s)
Kedia, Kushal S.; Ghoniem, Ahmed F.; Hong, Seung hyuck; Shanbhogue, Santosh
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Abstract
In this article, we investigate the impact of heat transfer between the flame and the flame-holder on the dynamic stability characteristics of a 50-kW backward-facing step combustor. We conducted a series of tests where two backward step blocks were used, made of ceramic and stainless steel, whose thermal conductivities are 1.06 and 12 W/m/K, respectively. Stability characteristics of the two flame-holder materials were examined using measurements of the dynamic pressure and flame chemiluminescence over a range of operating conditions. Results show that with the ceramic flameholder, the onset of instability is significantly delayed in time and, for certain operating conditions, disappears altogether, whereas with the higher conductivity material, the combustor becomes increasingly unstable over a range of operating conditions. We explain these trends using the heat flux through the flame-holder and the change in the burning velocity near the step wall. Results suggest a potential approach using low-thermal-conductivity material near the flame-holder as passive dynamics suppression methods.
Date issued
2013-07
URI
http://hdl.handle.net/1721.1/98855
Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Journal
Combustion Science and Technology
Publisher
Taylor & Francis
Citation
Hong, Seunghyuck, Santosh J. Shanbhogue, Kushal S. Kedia, and Ahmed F. Ghoniem. “Impact of the Flame-Holder Heat-Transfer Characteristics on the Onset of Combustion Instability.” Combustion Science and Technology 185, no. 10 (October 3, 2013): 1541–1567.
Version: Author's final manuscript
ISSN
0010-2202
1563-521X

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