Projeto, construção e ensaio de uma câmara de combustão de microturbina operando com etanol

Abstract

The design of a combustion chamber and a pressure-swirl atomizer for ethanol operation on a micro gas turbine were carried out at this work. Both the combustor and the injector were designed regarding the physical-chemical characteristics of anhydrous ethanol. However the influence of water in the fuel was analyzed in tests. Performance and exhaust emissions were performed. Also the Sauter Mean Diameter (SMD) and spray cone angle were defined. The investigation of the ar/fuel relationship, the pollutant emissions and their correlation with the fuel atomization and combustion efficiency was also executed. The run of the microturbine occurred in a deep-steady way, fact which validates both the combustor and the atomizer design. Equivalence ratio increased with the shaft angular velocity. Injection pressure increased with the fuel mass flow inducing a decrease in SMD. This event provoked a reduction on carbon monoxide (CO) and nitrous oxides (NO,) emissions evidencing the improvement on combustion efficiency.