3-DIMENSIONAL GAS-TURBINE COMBUSTOR EMISSIONS MODELING

An emission model that combines the analytical capabililities three-di mensional combustor performance codes with mathematical expressions ba sed on detailed chemical kinetic scheme is formulated. The expressions provide the trends of formation and/or the consumption of No(x), CO, and UHC in various regions of the combustor utilizing the details of t he flow and combustion characteristics given by the three-dimensional analysis. By this means, the optimization of the combustor design to m inimize pollutant formation and maintain satisfactory stability and pe rformance could be achieved. The developed model was used to calculate the emissions produced by several engine combustors that varied signi ficantly in design and concept, and operated on both conventional and high-density fuels. The calculated emissions agreed well with the meas urements. The model also provided insight into the regions in the comb ustor where excessive emissions were formed, and helped to understand the influence of the combustor details and air admissions arrangement on reaction rates and pollutant concentrations.