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.
|Original language||English (US)|
|Journal||Flow, Turbulence and Combustion|
|State||Published - Apr 7 2022|
Bibliographical noteKAUST Repository Item: Exported on 2022-04-18
Acknowledgements: Supported by Center Competitive Funding from King Abdullah University of Science and Technology (KAUST).
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Chemical Engineering(all)
- Physical and Theoretical Chemistry