Flow field and soot emission characteristics of staged swirling combustor
In order to investigate the flow field and soot emission characteristics of staged combustor,the flow field characteristics were studied by experimental and numerical simulation methods,and the flow development process was revealed.The results of large eddy simulation(LES)showed that there was a 1 820 Hz periodic velocity oscillation at the outlet of the pilot stage,but without obvious flow pulsation at the outlet of the main mode,and there was a precession vortex core(PVC)downstream the swirler.Numerical studies of soot emission characteristics showed that soot was abundant in primary recirculation zone.The soot concentration increased significantly with the increase of ratio of fuel and air in the lean combustion state.Along axial direction,the concentration of soot all showed a trend of decrease after rising first,and the peak corresponding to the axial position gradually moved back,ultimately resulting in a difference in soot emission from the combustor exit.
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