Simulation of Premixed Combustion with Varying Equivalence Ratio in Gas Turbine Combustor

Reynolds-averaged Navier-Stokes simulation of a gas turbine combustor with complex geometry is performed. The turbulence is modeled using a two-equation approach. The scalar mixing and combustion is modeled using a flamelet-based approach for partially premixed combustion. In this approach, transport equations to describe scalar mixing and reacting fields and their statistical interactions are solved along with standard conservation equations. The boundary conditions are specified using measured values. The computed spatial variations of averaged temperature and dry mole fractions of various scalars, including CO and NOx, compared quite well with measured values. The results of this combustion model are compared with the eddy-dissipation-concept model commonly used for gas turbine combustion calculation and this comparison showed that the results of partially premixed combustion model is improved considerably.