Abstract
In this study, a trapped-vortex gas-turbine combustor was designed and investigated to simultaneously achieve robust stability, low pollutant emissions, and the desired temperature distribution within a short flame length. In the combustor, a trapped-vortex combustion is established using two separated cavities. A swirler was adopted in the mainstream to improve mixing between the hot products of the cavity and mainstream air. Experimental tests conducted under atmospheric pressure indicate that the combustor can achieve encouraging performance in terms of flame stability, pollutant emissions, outlet temperature profiles, and flame length. Improvements of 19.2% and 23.3% were achieved by the lean ignition and blowout performances, respectively, as the combustor inlet temperature increased from 373 K to 473 K. As the fuel equivalence ratio increased from 0.25 to 0.55, the NOx emissions increased slightly, whereas the CO emissions first decreased and then increased slightly. Furthermore, two separated short flames with uniform outlet temperature profiles were obtained using the combustor. Interestingly, an “M” pattern temperature profile is obtained corresponding to the swirler center plane as compared to the parabola form outlet temperature profile corresponding to the 20-mm left side of the swirler center plane.
Published Version
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