The premixed combustion efficiency and emissions characteristics of four axial vane swirlers are compared with a simple grid plate stabilised premixed flame. The four swirlers are designed to investigate the influence of Swirl Number, pressure loss and swirler design. The results show that efficient combustion of weak mixtures at simulated gas turbine combustion conditions is difficult with swirl systems, but relatively easily achieved with grid plate systems. High swirl numbers are shown to have the worst combustion efficiency with a major unburned hydrocarbon problem. NOx emissions are similar for all the stabilisers and they all exhibit a very high proportion of NO2 and NOx emissions for weak mixtures.

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