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汽车安全与节能学报

汽车安全与节能学报 ›› 2014, Vol. 5 ›› Issue (04): 378-384.DOI: 10.3969/j.issn.1674-8484.2014.04.011

• 汽车节能与环保 • 上一篇    下一篇

超多喷孔喷射对高压共轨柴油机晚喷燃烧特性的影响

罗马吉1,2，李 辉1,2，缪雪龙3，魏明锐1,2   

  1. 1. 武汉理工大学 现代汽车零部件技术湖北省重点实验室，武汉 430070，中国；
    2. 武汉理工大学 汽车零部件技术湖北省协同创新中心，武汉 430070，中国；
    3. 中国第一汽车股份有限公司 无锡油泵油嘴研究所，无锡 214063，中国
  • 收稿日期:2014-07-29 出版日期:2014-12-25 发布日期:2014-12-29
  • 作者简介:罗马吉 (1974 － )，男( 汉)，江西，教授。E-mail: mjluo@whut.edu.cn
  • 基金资助:

    国家自然科学基金资助项目（51276132）

Effect of ultramultihole injection on combustion characteristics of high pressure common-rail diesel engine under late injection conditions

LUO Maji1,2, LI Hui1,2, MIAO Xuelong3, WEI Mingrui1,2   

  1. 1. Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology,Wuhan 430070, China;
    2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology,Wuhan 430070, China;
    3. First Automotive Works Wuxi Fuel Injection Equipment Research Institute, China FAW (First Automobile Workshop Group Corporation, Wuxi 214063, China
  • Received:2014-07-29 Online:2014-12-25 Published:2014-12-29

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摘要：

为实现柴油机的高效低排放燃烧，研究了在晚喷条件下的超多喷孔喷射对高压共轨柴油机喷
雾、燃烧和排放特性的影响。利用KIVA-3V 程序，对一台6 缸高压共轨柴油机进行三维模拟，并对
其进行了试验验证。结果表明：与传统喷油器相比，超多喷孔喷油器上、下层油束的干涉作用使喷雾
形态显得分散很多，这有利于雾化和蒸发。采用超多喷孔喷油器后，呈预混燃烧。与传统喷油器方案
相比，放热率峰值增大60%，NOx 排放增大36%，碳烟生成区域明显减小、峰值下降48%。在保证动
力性的前提下，采用超多喷孔喷油器和废气再循环技术、推迟喷油、提高喷射压力，NOx 降低64%，
碳烟降低46%。因而，这种柴油机能够实现高效清洁预混燃烧。

关键词: 柴油机, 高压共轨, 超多喷孔喷油器, 晚喷, NOx 排放, 碳烟排放

Abstract:

The effects of ultramultihole injection on spray, combustion, and emission characteristics were
investigated for late injection conditions to realize high-efficiency, low-emission combustion in a high-pressure
common-rail diesel-engine by ultramultihole injection. A 3-D simulation model was set up for a six-cylinder highpressure
common-rail diesel engine using a KIVA-3V code, and was then experimentally validated. The results
show that the interference between the upper-layer jets and the lower-layer jets of the ultramultihole nozzle makes the spray shape more fleecy compared with the traditional injector, in favor of the spray atomization and
vaporization. The in-cylinder mixture by ultramultihole nozzles distributes more evenly than the mixture using
traditional injectors, and the combustion process is mainly premixed combustion. The peak heat release rate
increases by 60%, the NOx emission increases by 36%, the soot emission formation region decreases clearly,
and the soot emission maximum decreases by 48%. The emission decreases 64% for NOx with 46% for soot,
without the power penalty by using the ultramultihole nozzle and exhaust gas recirculation (EGR) technique,
the postponing injection, and the increasing injection pressure. Therefore, high-efficiency clean premixed
combustion can be realized in a high-pressure common-rail diesel-engine with ultramultihole technology.

Key words: diesel engine, high-pressure common-rail, ultramultihole nozzle, late injection, NOx emission, soot emission