中心分级燃烧室预燃级燃烧性能实验

研究了一种中心分级燃烧室.在某大推力航空发动机慢车工况下,采用单头部矩形燃烧室,进行了燃烧性能实验,考察了预燃级旋流杯套筒扩张角、台阶高度、预燃级气量分配对污染排放、燃烧效率和贫油熄火油气比的影响作用.实验结果表明:慢车工况下,预燃级旋流杯套筒扩张角从60°增大到100°后,NOx排放降低42%,CO和未燃碳氢燃料(UHC)排放均增加2.5倍左右,燃烧效率降低1.75%,贫油熄火油气比从0.003 8增大到0.006 7;台阶高度减小24%后,NOx排放降低37%,CO和UHC排放分别增加1.5倍和1.2倍,燃烧效率降低1.32%,贫油熄火油气比从0.0042增大到0.0061;预燃级气量分配减小20%后,NOx排放增加13.5%,CO和UHC排放分别降低55.6%和38.9%,燃烧效率增大1.46%,贫油熄火油气比从0.006 1减小到0.005 1.

Experiment of combustion performance of internally-staged combustor pilot stage

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%.