Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Characterization of lean premixed turbulent swirling combustion regimes using OH planar laser induced fluorescence measurements
Submission Author:
Gabriela Senra Pessanha Rios Nobrega , RJ , Brazil
Co-Authors:
Gabriela Senra Pessanha Rios Nobrega, Letícia Piton, Luís Fernando Figueira da Silva, scouflaire philippe, Nasser Darabiha
Presenter: Luís Fernando Figueira da Silva
doi://10.26678/ABCM.COBEM2019.COB2019-0661
Abstract
Turbulent swirling combustion is often used for promoting stability in a wide range of flow conditions. Lean premixed combustion reduces NOx and soot emissions without reducing energetic efficiency, compared to classical non-premixed systems. This configuration is commonly applied to gas turbines and industrial burners. The present work is devoted to characterize lean premixed turbulent swirling combustion regimes in a laboratory burner with confinement. Five different combustion regimes have been observed and classified according to stability and structure of the flames. Planar laser induced fluorescence of OH radical has been used to characterize the topology of the flames. These PLIF-OH measurements allow to identify a reaction progress variable and, also, the corresponding variance. Combustion regimes diagrams are identified here as functions of the equivalence ratio and total volumetric flow rate of a CH 4 /air mixture. The regimes obtained are shown to be controlled by the mixture equivalence ratio mostly.
Keywords
premixed turbulent combustion, Swirling Flow, Flame stabilization
