NUMERICAL INVESTIGATION OF THE TURBULENCE- COMBUSTION INTERACTION IN NON-PREMIXED CH4/AIR FLAMES

The interaction between turbulence and combustion in non-premixed flames is numerically analyzed. The reaction rate is expressed as a function of the large-eddy time scale through applying the Spalding eddy dissipation model. The turbulence energy production and dissipation rates are simulated by the k turbulence model. The reacting NS equations were spatially discretized and solved through a finite volume scheme and a decoupled pressure-velocity approach, respectively. The flame was assumed to be steady-state, two dimensional and axisymmetric. The reported results include the velocity, temperature and turbulent reaction rate along the flame propagation field. It is found that the elevated augmentation of free stream turbulence intensity reduces the reaction zone significantly, hence, induces the flame extinction process