Experimental Study on Combustion Oscillation Characteristics,Flame Structures and NOx Emissions of the LPP Combustor
The combustion oscillation characteristics,evolution laws of flame structure and NOx emis-sions under different swirl numbers and humidities of the inlet fuel-air mixture of the lean premixed pre-vaporized(LPP)combustor were experimental studied by dynamic pressure transducers,planer laser in-duced fluorescence(PLIF)and gas analyzer.It is found that under certain inlet parameters of the LPP combustor,the equivalence ratio range of the combustion oscillation will expand and the combustion oscil-lation intensity will increase with an increase of the swirl number of the inlet fuel-air mixture,while the dominant frequencies of the combustion oscillations will decrease,and the flame will become more com-pact and continuously develop towards the center and upstream wall of the combustion chamber;as the humidity of the inlet fuel-air mixture increases,the intensity of the combustion oscillation in the LPP combustor will decline and even disappear,the dominant frequencies of the combustion oscillations will increase,the flame structure will change from flat to V-shape,and the flame will continuously develop to-wards the side wall and downstream direction of the combustion chamber;the NOx emissions of LPP com-bustor will decrease with the increase of the swirl number and humidity of the inlet fuel-air mixture.
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