Publication: Effect of an external electric field on the propagation velocity of premixed flames
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2014-06-25
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Elsevier
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Abstract
There have been many experimental investigations into the ability of
electric fields to enhance combustion by acting upon ion species present in flames. In
this work, we examine this phenomenon using a one-dimensional model of a lean
premixed flame under the influence of a longitudinal electric field. We expand upon
prior two-step chain-branching reaction laminar models with reactions to model the
creation and consumption of both a positively-charged radical species and free
electrons. Also included are the electromotive force in the conservation equation for ion
species and the electrostatic form of the Maxwell equations in order to resolve ion
transport by externally applied and internally induced electric fields. The numerical
solution of these equations allows us to compute changes in flame speed due to electric
fields. Further, the variation of key kinetic and transport parameters modifies the
electrical sensitivity of the flame. From changes in flame speed and reactant profiles we
are able to gain novel, valuable insight into how and why combustion can be controlled
by electric fields.
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Keywords
Premixed flame, Electric field, Laminar flame speed, Charged species, Chain-branching reaction
Bibliographic citation
Proceedings of the Combustion Institute 35 (2015) 3, pp. 3463–3470