COMPUTATION OF TURBULENT REACTING FLOW IN A JET-ASSISTED RAM COMBUSTOR

A stretched laminar flamelet model is used to simulate the turbulent c ombustion in a ram combustor with jet stabilized flames using a 28-ste p reaction mechanism with 10 species. Favre averaging is employed for the three-dimensional governing equations for continuity, momenta, mix ture fraction and the Variance of mixture fraction. Turbulence is simu lated by a low Reynolds number k-epsilon model which is also Favre ave raged. The presumed-PDF method is used for the closure of the chemistr y. 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 m ass averaged thermo-chemical variables are computed off-line after a c onverged solution has been achieved. Solution of the continuity equati on and the three momentum equations is achieved using the SIMPLER algo rithm. An incomplete lower upper pre-conditioned conjugate gradient me thod is used for the solution of the linearized system of equations. S imulation results showing the recirculation zones, distribution of spe cies and temperature are presented. Copyright (C) 1997 Elsevier Scienc e Ltd.