Abstract
This 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.
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This work is supported by Center Competitive Funding from King Abdullah University of Science and Technology (KAUST).
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Xiong, Y., Lacoste, D.A., Chung, S.H. et al. Effects of DC Electric Fields on Flickering and Acoustic Oscillations of an M-shape Premixed Flame. Flow Turbulence Combust 109, 459–475 (2022). https://doi.org/10.1007/s10494-022-00326-w
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DOI: https://doi.org/10.1007/s10494-022-00326-w