In view of the combustion characteristics of a micro gas turbine annular combustor

a planar laser induced fluorescence (PLIF) technique was used to investigate the effects of Reynolds number and equivalent ratio on the structural parameters of a methane/air premixed turbulent flame in the annular combustor. Results showed that the OH radical concentration distribution exhibited a ring structure with flame lift and bifurcation phenomena. The instantaneous and average images of OH-PLIF revealed that the flame had the common characteristics of turbulent flow and laminar premixed structure. The quantitative analysis of the characteristic parameters of flame structure showed that when the Reynolds number increased

the flame premixed conical structure was stretched and the interaction between jets was promoted. The conda effect made the inner flame bend towards the inner wall and the flame angle increase. Proper adjustment of the equivalent ratio of premixed flame is beneficial to the stability of flame structure.