Computation of the local flow structure, heat tranfer, and chemical species concentration in a two dimensional combustor of a gas turbine is described. The prediction is based on a modified TEACH computer program. A simulation of combustion of methne, the assumed fuel, is done in two major steps (C H4 ... C 0 + 2 H2 0 followed by C 0 + 1/2 02 ...C 02). In addition formation of other two dominant products, (NO) and (OH) is traced. Infleunce of some selected parameters, as air/fuel ratio, velocities ratio, diameters ratio on the performance of the combustor is demonstrated.