Computation of turbulent reacting flow in a jet assisted ram combustor

A stretched laminar flamelet model is used to simulate the turbulent combustion in a ram combustor with jet stabilized flames using a 28-step reaction mechanism with 10 species. Favre averaging is employed for the three-dimensional governing equations for continuity, momenta, mixture fraction and the Variance of mixture fraction. Turbulence is simulated by a low Reynolds number k-epsilon model which is also Favre averaged. The presumed-PDF method is used for the closure of the chemistry. For this purpose a beta-pdf is used for the mixture fraction and a log-normal-pdf is used for the modeled scalar dissipation. All other mass averaged thermo-chemical variables are computed off-line after a converged solution has been achieved. Solution of the continuity equation and the three momentum equations is achieved using the SIMPLER algorithm. An incomplete lower upper pre-conditioned conjugate gradient method is used for the solution of the linearized system of equations. Simulation results showing the recirculation zones, distribution of species and temperature are presented. Copyright (C) 1997 Elsevier Science Ltd.