A internally-staged combustor was studied. The combustion performance experiments using a single module rectangular combustor were performed under the idle condition of a large thrust aero-engine. The effects of flare angles of pilot swirl cup

step heights and pilot airflow rates on pollution emissions

combustion efficiency and lean blowout fuel/air ratio (LBO FAR) were investigated experimentally. The experimental results indicate that under the idle condition

NOx emission can decrease by 42% with CO

unborn hydrocarbon (UHC) emissions increasing by 2.5 times

combustion efficiency decreasing by 1.75% and LBO FAR increasing from 0.0038 to 0.0067 when the flare angle of pilot swirl cup increases from 60 degree to 100 degree; NOx emission can decrease by 37% with CO

UHC emissions increasing by 1.5 and 1.2 times

respectively

combustion efficiency decreasing by 1.32% and LBO FAR increasing from 0.0042 to 0.0061 when the step height decreases by 24%; NOx emission can increase by 13.5% with CO

UHC emissions decreasing by 55.6% and 38.9%

respectively

combustion efficiency increasing by 1.46% and LBO FAR decreasing from 0.0061 to 0.0051 when the pilot airflow rate decreases by 20%.