Impact of variable geometry combustor on performance and emissions from miniature gas turbine engine

Results of theoretical studies are in good agreement with results obtained experimentally. Both show significant advantages of utilization of the variable geometry combustion chamber in terms of performance and emissions reduction. The NOX reduction by over 40% in comparison to standard geometry combustion chamber and double reduction in CO emissions for variable geometry combustor were noted. Additionally, the results are compared with real GTM-120 engine performance and emissions from bench testing [3]. Based on the experimental data, a set of 3-D performance and emissions maps has been created. The maps are aimed to aid for variable area dilution zone inside a small gas turbine engine control law creation.