USING LARGE EDDY SIMULATIONS TO UNDERSTAND COMBUSTION INSTABILITIES IN GAS TURBINES

摘要

This paper presents a study of the stability of a swirled premixed combustion chamber both with and without reaction using Large Eddy Simulation and a numerical solver able to handle complex geometries. It is shown that cold flow instabilities, which are observed in the non-reacting case (especially precessing vortex cores), are strongly damped in the reacting case, suggesting that these natural flow instabilities are not the first source of combustion instabilities in such configurations.