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Analysis of a methane/air flame propagating in a two-dimensional small-scale channel with consideration of the conjugate heat transfer

Abstract : The flow physics controlling the stabilization and propagation of a methane/air laminar premixed flame in a narrow channel is revisited from numerical simulations. Combustion is described with complex chemistry and transport properties, along with a coupled simulation of heat transfer at and within the wall. First, a chemistry mechanism reduction procedure fitted to this application is applied. Second, the response of the premixed flame shape to various heat transfer conditions is analyzed in terms of flame propagation velocity and flow topology in the vicinity of the reactive front. Third, the heat transfer mechanism triggering the flame movement when this last is submitted to an upstream wall preheating is revealed to be mainly convective. To finish, the preponderant role of gravity, via an impact on the baroclinic torque, in the symmetry breaking of small-scale channel flames is demonstrated.
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Submitted on : Thursday, May 9, 2019 - 5:35:11 PM
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  • HAL Id : tel-02124658, version 1

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Kévin Bioche. Analysis of a methane/air flame propagating in a two-dimensional small-scale channel with consideration of the conjugate heat transfer. Fluids mechanics [physics.class-ph]. Normandie Université, 2018. English. ⟨NNT : 2018NORMIR25⟩. ⟨tel-02124658⟩

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