Effects of swirler airflow split on emissions of full annular combustor
To study the effects of swirler airflow split on the combustor emission characteristics,experimental investigations were conducted on the full annular combustor of dual-axial swirler with airflow ratio of 0.85 and 1.1,respectively,under the ground idle,flight idle and take off conditions.The experimental results indicated that when the airflow ratio increased from 0.85 to 1.1,NOx of flight idle and take off conditions was reduced by 33％—52％and 14％—38％,respectively,while CO and unburned hydrocarbon(UHC)of ground idle were reduced by 23％—49％and 32％—36％.NOx of ground idle for the two cases of swirlers had little difference,and the emission values were both low.CO and UHC emissions were mainly concentrated in the condition of ground idle,and the emission of CO and UHC gradually decreased with the increase of the state,and there was little difference in the emissions of CO and UHC between the two schemes.Within the test range,the CO emission index of the full annular combustor presented a power function decline with the increase of NOx emission index,and a logarithmic increase with the increase of UHC emission index.
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