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TURBULENCE EFFECT ON THE STABILISATION REGIMES OF NON-PREMIXED FLAMES

Isabelle Esquiva-Dano
Laboratoire de Mecanique des Fluides et d'Acoustique - UMR 5509 Ecole Centrale de Lyon 36, avenue Guy de Collongue / BP 163 69131 Ecully Cedex, France

Dany Escudie
Centre de Thermique de Lyon (CETHIL CNRS-INSA Lyon-UCBL), INSA de Lyon, 69621 Villeurbanne, France

Abstract

The aim of this experimental study is to point out the turbulence effect on the stabilisation mechanisms of a non-premixed flame. With this objective, a non-premixed methane-air flame stabilised on a tulip bluff-body is investigated. By means of direct visualisations and laser Doppler anemometry, an accurate description of the aerodynamic flow is provided. The influence of turbulence on the non-premixed stabilisation diagram is first described. Results point out an earlier transition of the five different regimes. Then the specific laminar ring flame region, where stabilisation is linked to the existence of a triple point, is particularly detailed. The main effect of turbulence is to modify the ring flame position and shape. A regular wave appears which analysis needs further development.