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汽车安全与节能学报

汽车安全与节能学报 ›› 2013, Vol. 4 ›› Issue (4): 379-384.DOI: 10.3969/j.issn.1674-8484.2013.04.012

• 汽车节能与环保 • 上一篇    

柴油机预喷射策略对燃烧及排放影响的试验研究

曹 科，成晓北*   

  1. 华中科技大学 能源与动力工程学院，武汉 430074，中国
  • 收稿日期:2013-08-22 出版日期:2013-12-25 发布日期:2014-01-15
  • 作者简介:曹科（1989—），男（汉），湖北，硕士研究生。E-mail ：ckhust2007@gmail.com
  • 基金资助:

    国家自然科学基金（51176056）

Experimental study of the pilot injection strategy effects on#br# diesel engine combustion and its emission

CAO Ke, CHENG Xiaobei   

  1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2013-08-22 Online:2013-12-25 Published:2014-01-15

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摘要：

用试验方法，研究一次预喷射和两次预喷射策略对柴油机燃烧及排放影响。利用一台直列4
缸、涡轮增压、高压共轨柴油机，在转速为1 500 r/min 时，在中低负荷 （平均有效压力为0.86 MPa
和0.43 MPa）下，测量了预喷油量m ' 和预喷射与主喷射的间隔角α、缸内压力p 、燃烧放热率E '，以
及一氧化氮NO、碳氢化合物HC、一氧化碳CO 和碳烟排放。分析表明： α 和m ' 都影响预喷和主喷的
E '，间隔角对于主喷滞燃期的的影响比预喷油量的影响更大。采用一次预喷射策略时，合理地选择预
喷射与主喷射的间隔角和预喷油量，可以降低NO 和碳烟排放，并且不会对HC 和CO 排放造成明显恶
化。因此，采用两次预喷射策略可以促进燃油与空气的混合；两次预喷射之间的间隔角较小时，对改
善排放的效果更好。

关键词: 柴油机, 预喷射策略, 燃烧, 排放, 试验

Abstract:

The effects of one-pilot injection strategy and two-pilot injection strategy on combustion and
emission are investigated in a four-cylinder, turbocharged, high pressure common-rail diesel engine. The pilotmain
injection intervals, the pilot injection quantities, the diesel combustion pressures, the heat release rates,
and the emissions of NO, HC, CO, and soot were measured. The results show that both pilot-main injection
interval and pilot injection quantity strongly affect the pilot combustion heat release and the main combustion
heat release, and that the effect of pilot-main injection interval on main combustion ignition delay is more evident
than the effect of pilot injection quantity. The emission of NO and soot are reduced without obvious deterioration
in HC and CO when choosing appropriate pilot-main injection interval and pilot injection quantity under one-pilot
injection strategy. Using two-pilot injection strategy enhances the mixing of fuel and air. The emission is more
improved, when the two-pilot injection interval is less.

Key words: diesel engines, pilot injection strategy, combustion, emission, experiments

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