摘要
以226B压燃式二甲醚发动机为研究对象,通过对比试验分析了二甲醚喷油器启喷压力、喷孔直径、喷油提前角和发动机功率对HC排放性的影响。试验结果表明：在外特性的整个转速范围内,随发动机转速的增加HC排放呈先增加后减小的趋势,随喷油器启喷压力的升高HC排放呈降低趋势;外特性在1 000～1 300r/min低速情况下,喷孔直径0.38mm的喷油器HC排放低,转速在1 500～2 300r/min范围内,喷孔直径0.36mm的喷油器HC排放较低;静态供油提前角由曲轴转角13°推迟到8°,外特性HC排放呈先降低后升高的趋势;随着二甲醚发动机负荷率的升高,其HC排放呈降低趋势。
A 226B compression ignition DME engine was investigated. The effects of DME injector nozzle opening pressure, nozzle hole diameter, fuel injection advance angle and engine power on HC emission were studied by a comparative test and analysis. The experimental results show that over the whole speed range on the full load performance curve, the HC emission shows a trend of ascending first and then descending with the increase of the engine speed, and shows a descending trend with the increase of injector nozzle opening pressure. The HC emission is low over a speed range from 1 000 r/min to 1 300 r/min when the nozzle hole diameter is 0. 38 mm, while the HC emission is relatively low over a speed range from 1 500 r/min to 2 300 r/min when the nozzle hole diameter is 0.36 ram. The HC emission on the full load performance curve shows a trend of descending first and then ascending when the static fuel supply advance angle delayed from 13° crank angle before TDC to 8°crank angle before TDC. The HC emission decreases with the increase of the DME engine load.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2016年第3期13-17,22,共6页
Chinese Internal Combustion Engine Engineering
基金
国家“八六三”高技术研究发展计划项目(2012AA111721)
