Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
GEOMETRY INFLUENCE ON COMBUSTION INSTABILITIES IN DOUBLE-STAGE SWIRL NUMBER
Submission Author:
Dener Silva de Almeida , MA
Co-Authors:
Dener Silva de Almeida, Pedro Lacava
Presenter: Dener Silva de Almeida
doi://10.26678/ABCM.COBEM2019.COB2019-0279
Abstract
. This work presents a new Low-NOx combustor configuration to especial application in gas turbine. In this new concept, the combustion happens in two stages, being the first one rich in fuel (primary chamber) and the second with deficiency. Therefore, the occurrence of the unfavorable conditions for NOx formation is obtained through the dynamic control of the reactants flow. Five control combustion process parameters are analyzed: equivalence ratio, primary chamber length/diameter ratio (L/D), fuel jet Reynolds number, swirler blades angle and second chamber diameter. However, for some parameter combinations, it’s observed the combustion acoustic instabilities phenomena. The results show that such instabilities can be attenuated and even suppressed by a better recirculation structure in the second stage, which in turn is achieved by proper selection of operating parameters and by increasing the diameter of the same stage.
Keywords
Combustion, combustion instabilities, Gas Turbine
