Experimental investigation of the Interaction of Flame Front Fluctuations with Combustion of a Premixing Gas Turbine Burner

摘要

NO{sub}x emissions of modern gas turbine burners could be reduced in gas turbine combustion systems by introducing premixed burners in which reactants are mixed prior to combustion. The NO{sub}x reduction performance and the flame stability is related to the degree of mixing. In this context little is known about the impact of unsteady mixing and flow phenomena like processing vortex core and vortex shedding. A test rig for the investigation of a single full-scaled heavy duty gas turbine burner at atmospheric pressure has been set up recent by at the Institute of Thermal Turbomachinery. In the present study, premixed operation of the burner has been investigated by phase-locked LDA measurements. Particular emphasis was put on the interaction of the unsteady flow with combustion under strong self-excited combustion oscillations. In addition, the reacting flow field is compared to the non-reacting flow in order to verify if the same coherent structure is present.