Numerical simulation of a premixed turbulent V-shaped flame

Abstract

de ROUEN, Saint Etienne du Rouvray, Cedex, France AU Jemni A. AF Laboratoire d?Etudes de Syst?mes thermiques et Energ?tique (LESTE), Monastir, Tunisie KW premixed turbulent combustion % numerical simulation % V-flame KR nema AB In this paper we simulate a turbulent premixed V-shape flame stabilized on a hot wire. The device used is composed of a vertical combustion chamber where the methane-air mixture is convected upwards with a mean velocity of 4ms-1. The flow was simulated running Fluent 6.3, which numerically solved the stationary Favre-averaged mass balance; Navier-Stokes equations; combustion progress variable, and k-? equations on a two-dimensional numerical mesh. We model gaseous mixture, ignoring Soret and Dufour effects and radiation heat transfer. The progress variable balance equation was closed using Eddy Break Up model. The results of our simulations allow us to analyze the influence of equivalence ratio and the turbulent intensity on the properties of the flame (velocity, fluctuation, progress variable and Thickness of flame).This work gives us an idea on the part which turbulence can play to decrease the risks of extinction and instabilities caused by the lean premixed combustion. nema