Burner geometry effects on combustion and NO(x) emission characteristics using a variable geometry swirl combustor

The effects of burner geometry on combustion efficiency and NO(x) emissions are investigated using an experimental stationary-type gas-turbine combustor. The previous configuration of the University of Maryland variable-geometry multiannular swirl burner (Gupta et al., 1977 and 1988), in which fuel and air are introduced at the center and outer annuli, respectively, is compared with a novel configuration in which a fuel-air mixture is introduced at the center. The results are presented in extensive graphs and discussed in detail. It is found that the new configuration can be adjusted to produce significantly lower NO(x) emissions while maintaining high combustion efficiency over wide range of burner loadings. 14 references.