Modeling of Lifted Methane Jet Flames in a Vitiated Coflow Using a New Flame Extinction Model

In this article, flame liftoff height predictions have been carried out for diluted methane jet flames with high temperature and vitiated coflow. Three-dimensional mass, momentum, energy, and species equations are solved with modified k–ϵ and modified k–ω turbulence models to predict the behavior of lifted jet flames. The effect of turbulence model parameters, fuel jet velocity and coflow velocity has been investigated for jet flames. The flame is assumed to be quenched when the fluid time scale is less than the chemical time scale (Da = τ f /τ ch