AN ANALYTICAL DESIGN METHODOLOGY FOR AN ANNULAR COMBUSTOR

This paper describes a computational procedure for the optimization of the performance: parameters of a simulated annular combustor. This me thod has been applied to analyze the influence of the performance para meters and geometries on the annular combustor characteristics and pro vide a good understanding of combustor internal flow fields, and there fore it can be used for guiding the combustor design process. The appr oach is based on the solution of governing nonlinear, elliptic partial differential equations for 3-D axisymmetric recirculating turbulent r eacting swirling flows and the modelling of turbulence, combustion, th ermal radiation and pollutant formation. The turbulence effects are in troduced via tile modified two-equation k-epsilon model. Turbulent com bustion is modelled using the k-epsilon-g model and a two-step turbule nt combustion model is employed for the excess emission of carbon mono xide CO. For the evaluation of the NO pollutant formation rate, the NO pollutant formation model, which takes into account the influence of turbulence, presented here. The radiative heat transfer is handled by the heat flux model. The predictions of the combustor character-istics and performance parameters are made using the present approach. Predi ctions of velocity, length of the recirculation zone, combustion effic iency and wall temperature are compared with measurements. Agreement b etween the predictions and experimental data is very satisfactory.