DNS and Modeling for Turbulent Premixed Combustion

Abstract

Fully developed turbulent premixed flames were directly simulated in different cases P_u/P_b=7.53,2.50 while u'/u_L was close to unity. Analysis of the Favre-averaged transport equation for turbulent kinetic energy showed pressure concerning terms produced kinetic energy in flame brush, and mean pressure gradient ternm, pressure dilatation term and additional dissipation components were modeled. Analysis of the Favre-averaged transport equation for turbulent scalar flux showed pressure concerning terms and velocity-reaction rate correlation term were sources for counter-gradient diffusion, and mean pressure gradient term, fluctuating pressure term, dissipation terms and velocity-reaction rate correlation term were modeled.