An Experimental Study on Kerosene-Hydrogen Hybrid Combustion in a Gas Turbine Combustor

Kerosene-hybrid combustion was studied in a swirler type combustor. Kerosene was atomized by an air blast atomizer, and geseous hydrogen was supplied to a kerosene spray through an annular slit installed in the atomizer. The following results were obtained. Blow out limit of the flame shifts to the lea side of the air-fuel mixture in the hybrid combustion. Hybrid combustion results in a slight decrease in NOx emission and a remarkable decrease in soot emission. When the hybrid ratio is under 10%, the flame stability is improved by the hybrid combustion. Increasing the hybrid ratio from 10% to 50% produces and increased combustion efficiency and reductions of soot and NOx. While the hybrid ratio is over 50%, the characteristics of the hybrid combustion flame become similar to those of hydrogen gas flame.