Off Design Behavior of a 100kW Turbec T100P Micro Gas Turbine

The off design behavior of a 100kW Turbec T100P micro gas turbine fuelled with methane is analyzed in the paper. The work is focused on the analysis of combustion efficiency, overall performance and gaseous emissions at different loads. A critical comparison between experimental data and results of a 3D CFD analysis of the combustor is discussed. The RANS RSM turbulence model is used in the numerical computations. The Zeldovich mechanism for NO formation evaluation is coupled to a methane-oxygen multistep chemical kinetic mechanism for predicting the concentration of O2, CO2, CO and NO at the exhaust. The experimental campaign showed no sensible variations in NOx emissions by varying MGT load; otherwise a great CO increasing is highlighted by load decreasing. The results of numerical analysis are in good agreement with experimental data as concerns CO emissions, while overestimate NO production in the diffusive flame region at 50% load.