A CFD Based Off-Design Study of Micro-Gas Turbines Combustors

Abstract

The authors examine different off-design conditions induced in a lean-premixed combustor by some typical transient processes of a micro-gas turbine. The latter is subject to frequent changes in both thermal and mechanical load and the unsteady transition from one regime to a different one produces significant variation in the boundary conditions and in the fuel/air equivalence ratio as well. After a proper definition of the computational domains, a CFD based simulation allows examination of typical situations within full-to-part or part-to-full load transitions. Some results discussed in the paper suggest substantial modifications of the fuel supply laws for a more effective control of both temperature rise and pollutant production.