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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v41.i4.10
pages 283-295

Experimental Characterization of the Velocity Field in Turbulent Oxy-Flame of a Coaxial Burner

Z. Riahi
Centre de Recherches et des Technologies de l'Energie Borj Cedria Hammam-Lif, Tunisie
Mohamed Ali Mergheni
CORIA UMR 6614 CNRS - Université et INSA de Rouen, France; (LESTE) Ecole Nationale d'Ingenieurs de Monastir; Ecole Superieure des Sciences et Technologie de Hammam Sousse, Sousse, Tunisie
S. Yon
CORIA UMR 6614 CNRS - Université et INSA de Rouen Rouen, France
J. C. Sautet
CORIA UMR 6614 CNRS - Université et INSA de Rouen, Avenue de l'Université, BP 12, 76801 Saint Etienne du Rouvray, Cedex, France
Gilles Godard
CORIA UMR 6614 CNRS - Université et INSA de Rouen Rouen, France
C. Gobin
CORIA UMR 6614 CNRS - Université et INSA de Rouen Rouen, France
Sassi Ben Nasrallah
Laboratoire d'Études des Systèmes Thermiques et Énergétiques, Ecole Nationale d'Ingénieurs de Monastir, Monastir 5019 Tunisie

ABSTRAKT

Most industrial applications consuming a much primary energy, such fuel and gas, used different technologies of burners. The thermal efficiency and polluting emissions depends on the burner nozzle, on the fuel type and oxidant type (air or pure oxygen). This article is interested by the dynamic study in a coaxial burner consisting by two coaxial circular jets: a central jet to inject natural gas and the annular jet for pure oxygen injection. The aim of this work is the experimental study of two free coaxial jets with flame disposed in ambient air and to have the effect of varying equivalence ratio on the flow structure. This study carried in three configurations; two configurations made in lean combustion mode (Φ = 0.65, Φ = 0.8) and the stoichiometric configuration (Φ = 1). The variation in the amount of oxygen in the combustion reaction affects on the longitudinal velocity, on the transversal velocity and on the turbulent fluctuation. These parameters are very important and affect directly on the flame structure. The reduction of equivalence ratio leads to increased of longitudinal and transverse velocity and promotes the fluctuation in interaction zone between natural gas and oxygen. At the stoichiometric reaction, the turbulent intensity represents a maximum in the mixing zone. This maximum increases when the height above the burner increases.


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