上海交通大学学报

上海交通大学学报（自然版）

• 环境科学 • 上一篇    下一篇

分段喷射对柴油机噪声与排放影响的试验和模拟分析

石秀勇1,2，乔信起2，倪计民1，郑媛媛3
  

  1. （1. 同济大学 汽车学院， 上海 201804； 2. 上海交通大学 机械与动力工程学院，
    上海 200240； 3.山东交通学院 土木工程系， 济南 250023）
  • 收稿日期:2009-09-16 修回日期:1900-01-01 出版日期:2010-11-30 发布日期:2010-11-30

Experimental and CFD Study on Combustion Noise and Pollutant Emissions of Diesel Engine with Split Injections of Common Rail System

SHI Xiuyong1,2,QIAO Xinqi2,NI Jimin1,ZHENG Yuanyuan3
  

  1. （1. College of Automotive Studies, Tongji University, Shanghai 201804, China; 2. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 3. Department of Civil Engineering, Shandong Jiaotong University, Jinan 250023, China）
  • Received:2009-09-16 Revised:1900-01-01 Online:2010-11-30 Published:2010-11-30

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.

关键词: 重型柴油机, 分段喷射, 燃烧噪声, 污染物排放

Abstract: 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 NOx 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 NOx 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.

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