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Stabilization and propagation of lean premixed flames in small dimensions conducts in strong thermal interaction with the walls

Abstract : The energy system needs of a few tens of Watts grow as the demand for reducedsize portable devices grows. Combustion energy conversion remains the most efficient process per kilogram transported. However, the stabilization of low-power flames in confined environments remains a challenge because the thermal exchanges between the flame and the outside are very important compared to the power of the flame and condition the capacity of the system to produce energy in a continuous and stable way. The thesis work proposed here studies the properties of a methane flame in a 5 mm diameter tube and the heat exchanges with the environment. It is shown experimentally using innovative diagnostics and numerically that under certain conditions, the flame loses its symmetry and can move according to heat exchanges. This work also explores the possibility of assisting the flame by coupling it to a microwave plasma.
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Submitted on : Friday, May 29, 2020 - 9:51:11 AM
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  • HAL Id : tel-02648553, version 1

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Amanda Pieyre. Stabilization and propagation of lean premixed flames in small dimensions conducts in strong thermal interaction with the walls. Fluids mechanics [physics.class-ph]. Université Paris-Saclay, 2019. English. ⟨NNT : 2019SACLC053⟩. ⟨tel-02648553⟩

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