Abstract
Abstract Numerical analysis of lean-premixed flames is utilized to investigate the correlation between turbulence and combustion, fuel–air mixing, and NO x emission using three types of micro gas turbine combustors. Swirl flows generating vortex breakdown and flow recirculation contributing to mixing uniformity are improved by interaction of burners. Mixing plays an important role in flame dynamics and NO x emission by means of the unmixedness parameter. To discuss the correlation between flame characteristics and vorticity structures, progress variable c is introduced. The flame stability is enhanced by ring-shaped, large-scale vorticity structures, and air–fuel mixing is increased by momentum and kinetic energy.
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