Effects of DC Electric Fields on Flickering and Acoustic Oscillations of an M-shape Premixed Flame
KAUST DepartmentClean Combustion Research Center
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Embargo End Date2023-04-07
Permanent link to this recordhttp://hdl.handle.net/10754/676269
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AbstractThis paper reports on the effect of DC electric fields on the dynamics of a premixed methane-air laminar flame, in a buoyant environment. DC electric fields can be capable of affecting both the buoyancy-driven flickering oscillation of the flame and the response of the flame to acoustic modulation of the flow. We conduct fast visualization of the emission of excited methylidyne radicals (CH*), representing the heat release rate of the flame. Such visualizations are also synchronized with electric current and voltage measurements. We notice that the suppression of buoyancy-driven flickering oscillations can be obtained by applying sub-critical negative DC voltages. Moreover, the current measured in the inter-electrodes area is analyzed for positive and negative DC applied voltages and we find that this quantity cannot be used as a tracer of heat release rate in a configuration where the flame location in the inter-electrodes gap varies with sub-critical electric fields. In addition, the effect of DC electric fields on the flame transfer function for acoustic modulation of the flow is reported and discussed.
CitationXiong, Y., Lacoste, D. A., Chung, S. H., & Cha, M. S. (2022). Effects of DC Electric Fields on Flickering and Acoustic Oscillations of an M-shape Premixed Flame. Flow, Turbulence and Combustion. https://doi.org/10.1007/s10494-022-00326-w
SponsorsSupported by Center Competitive Funding from King Abdullah University of Science and Technology (KAUST).
PublisherSpringer Science and Business Media LLC
JournalFlow, Turbulence and Combustion