Abstract
Simultaneous measurements of CH and OH radicals by planar laser induced fluorescence have been conducted to clarify the relation between the flame structure and combustion noise characteristics in the swirl-stabilized combustor controlled by secondary fuel injection. The secondary fuel injection reduces spatial and temporal fluctuation of the high temperature region in the recirculation zone, which results in the reduction of the combustion noise. The frequency control of the secondary fuel injection also reduces the spatial and temporal fluctuation of the flame fronts in the flame zone (or flame bush). At the relevant control frequency, the flame bush becomes thinner and is confined to narrow region.
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