摘要
研究了重型柴油机上有无预喷射、不同预喷油量和预喷间隔对燃烧噪声与污染物NOx和颗粒PM排放的影响,以及不同后喷油量和后喷间隔对NOx和颗粒PM排放的影响情况;利用CFD三维数值模拟分析了各参数的影响原因.结果表明:预喷射的引入,改善了燃烧噪声和燃烧过程的剧烈程度,并存在1.0 mg油量与/或45°CA间隔的预喷射方案而降低NOx生成且不增加颗粒PM的排放;后喷射的引入,降低了颗粒PM排放而对NOx生成影响很小.数值模拟结果揭示了后喷射引起的湍流运动是促进碳烟氧化的一个主要因素.
In order to explore the impact laws of split injection strategies on combustion noise and emission characteristics,experimental studies and CFD simulations were conducted on a heavy duty diesel engine with common rail sytem,by varying different pilot and post injection parameters.The results showed that the combustion noise was mitigated by introducing fuel pilot-injection;the NO_x emission could be reduced by pilot-injection combination of 1.0 mg fuel quantity and/or 45°CA injection interval,without penalty of PM emission too much.Besides,PM emission could be decreased under all post-injection conditions with no NO_x increased.More important,through CFD simulation with H-ARR soot model revised showed that the turbulent flow motion caused by post-injection spray was one of the key factors enhancing soot oxidization.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2010年第11期1566-1572,共7页
Journal of Shanghai Jiaotong University
关键词
重型柴油机
分段喷射
燃烧噪声
污染物排放
碳烟氧化
heavy duty diesel engine
split injections
combustion noise
pollutant emissions
soot oxidization
