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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EXPERIMENTAL STUDY OF A LEAN PREMIXED TURBULENT SWIRLING FLAME STABILIZATION
Submission Author:
Luís Fernando Figueira da Silva , RJ , Brazil
Co-Authors:
Luís Fernando Figueira da Silva, Carolina Mergulhão, Letícia Piton, scouflaire philippe, Nasser Darabiha
Presenter: Luís Fernando Figueira da Silva
doi://10.26678/ABCM.COBEM2017.COB17-0808
Abstract
Lean premixed turbulent combustion technologies often involve swirl-stabilized combustion, which exhibit the fundamental challenges of adequately predicting the combustor blow-off and flashback limits. Among the factors influencing the turbulent swirling flame and combustor behavior, the swirler and combustion chamber geometrical features are paramount. The present work is devoted to experimental characterization of the swirler geometry and the influenced combustion chamber confinement on blow-off characteristics and flame topologies of swirl-stabilized, premixed methane-air turbulent flames. A novel experimental test bench is first described, which allows for easily changing the radial swirler geometrical features and the combustion chamber confinement. Different flame shapes are shown to characterize the unconfined and confined flames, the latter exhibiting significant interactions with the combustion walls. The combustor blow-off limits are determined as functions of the mixture composition and flow rate. An important decrease of the blow-off equivalence ratio is observed when the flames are confined.
Keywords
Experimental Study, swirling flows, blow-off, combustion instability, confinement stability, flame topology
