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[1]王 健,郑尊清,王 浒,等.内部EGR 和燃料辛烷值对小负荷低温燃烧的影响[J].燃烧科学与技术,2017,(04):358-364.[doi:DOI 10.11715/rskxjs.R201605040]
 Wang Jian,Zheng Zunqing,Wang Hu,et al.Effects of Internal EGR and Fuel Octane Number of Fuelon Low Temperature Combustion at Low Loads[J].Journal of Combustion Science and Technology,2017,(04):358-364.[doi:DOI 10.11715/rskxjs.R201605040]
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内部EGR 和燃料辛烷值对小负荷低温 燃烧的影响()
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《燃烧科学与技术》[ISSN:1006-8740/CN:12-1240/TK]

卷:
期数:
2017年04
页码:
358-364
栏目:
出版日期:
2017-08-15

文章信息/Info

Title:
Effects of Internal EGR and Fuel Octane Number of Fuel on Low Temperature Combustion at Low Loads
作者:
王 健郑尊清王 浒王小峰
天津大学内燃机燃烧学国家重点实验室,天津 300072
Author(s):
Wang JianZheng ZunqingWang HuWang Xiaofeng
State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China
关键词:
内部EGR辛烷值小负荷燃烧排放
Keywords:
internal EGRoctane numberlow loadcombustionemissions
分类号:
TK421
DOI:
DOI 10.11715/rskxjs.R201605040
文献标志码:
A
摘要:
将不同比例的正庚烷和异辛烷掺混得到3 种不同辛烷值的混合燃料PRF70、PRF80 和PRF90,在单缸直 喷柴油机上研究了燃料辛烷值和基于排气门两次开启的内部EGR 策略对高辛烷值燃料小负荷低温燃烧的影 响.结果表明,小负荷工况(平均指示压力小于0.3,MPa)下,适当增大内部EGR 率能提高缸内温度,改善高辛烷 值燃料的燃烧稳定性和HC、CO 排放,但内部EGR 率过大时由于废气的稀释作用增强,对高辛烷值燃料小负荷 燃烧带来不利影响;燃料辛烷值对高辛烷值燃料的燃烧有影响,随着辛烷值增大,着火始点推迟,放热速率降 低,HC 和CO 排放升高,燃烧稳定性下降.通过采用合适的喷油时刻、内部EGR 策略结合辛烷值优化能够实现 高辛烷值燃料在小负荷工况的稳定燃烧.
Abstract:
Three fuels with different octane number(70/80/90)obtained by blending iso-octane and heptane were tested on a single-cylinder diesel engine to investigate the effects of octane number and internal EGR achieved by 2-EVO strategy on low temperature combustion fuelled with high octane number fuel at low load.The results show that properly increasing internal EGR rate can increase the in-cylinder temperature,which in turn improves the combustion stability and reduce the HC and CO emissions.However,excessive internal EGR rate would bring adverse effects to combustion due to stronger dilution with more exhaust gas.Octane number significantly affects the combustion of high octane number fuel.As the octane number increases,delayed auto-ignition,reduced rate of heat release and increased HC and CO emissions are observed.Stable combustion can be achieved by adopting optimal injection timing and internal EGR strategy with suitable octane numbers at low loads.

备注/Memo

备注/Memo:
收稿日期:2016-09-28. 基金项目:国家自然科学基金资助项目(51576138). 作者简介:王 健(1989— ),男,硕士研究生,hustjohn@live.com. 通讯作者:王 浒,男,博士,副教授,wang_hu@tju.edu.cn.
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