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活性添加剂对高辛烷值燃料HCCI着火时刻与燃烧速率的影响
引用本文:吕兴才,陈伟,黄震.活性添加剂对高辛烷值燃料HCCI着火时刻与燃烧速率的影响[J].燃烧科学与技术,2005,11(3):241-247.
作者姓名:吕兴才  陈伟  黄震
作者单位:上海交通大学内燃机研究所,上海,200030
基金项目:国家重点基础研究发展规划(973)资助项目(2001CB209208),国家自然科学基金重点资助项目(50136040).
摘    要:为研讨活性添加剂过氧化二叔丁基(DTBP)对高辛烷值燃料以HCCI燃烧模式运行时的放热率特征、着火时刻、燃烧持续期和排放特性的影响,在一台单缸发动机上,在辛烷值为90(RON90)(90%的异辛烷和10%的正庚烷)的混合燃料中加入不同比例(0~4%)的DTBP,考察5种燃料在1800r/min下不同负荷时的燃烧特性和排放特性.实验结果表明:RON90中没有添加剂时,只能在高温、高负荷下才能以HCCI燃烧模式运行;在其中加入少量的DTBP后,RON90实现HCCI燃烧的工况范围向低温低负荷下大幅度拓展.各种燃料的HCCI燃烧冷焰反应发生在850K左右,到950K结束,进入负温度系数区(NTC),在1125K左右突破NTC区而发生热着火.随DTBP含量增加,系统温度达到冷焰反应和热焰反应的化学时间尺度缩短,因此着火时刻提前,燃烧持续期缩短,特别是提高了低负荷下的燃烧速率.添加剂使各种当量比下未燃碳氢(UHC)和一氧化碳(CO)排放显著改善,NOx排放也保持在很低的水平.

关 键 词:均质充量压缩着火(HCCI)  添加剂  高辛烷值燃料  燃烧  排放
文章编号:1006-8740(2005)03-0241-07
修稿时间:2004年4月9日

Effect of Additive on the Ignition, Combustion, and Emissions for HCCI Engine Fueled with High RON Fuels
U Xing-cai,CHEN Wei,HUANG Zhen.Effect of Additive on the Ignition, Combustion, and Emissions for HCCI Engine Fueled with High RON Fuels[J].Journal of Combustion Science and Technology,2005,11(3):241-247.
Authors:U Xing-cai  CHEN Wei  HUANG Zhen
Abstract:The effects of the Di-tertiary butyl peroxide (DTBP) additive on the heat release rate, ignition timing, combustion duration, and emissions of HCCI engine fueled with high research octane number (RON) fuels were investigated. The experiments were performed using 0, 1% 2%, 3%, and 4% (by volume) DTBP-RON90 blends. The RON90 fuel were obtained by blending 90% iso-octane with 10% n-heptane. The Combustion and emission features of 5 fuel at different (1 800 r/min) loads were examined.The experimental results show that without addictive in RON90, HCCI combustion is only possible within the high temperature and high engine load range oporation. The operation range is remarkably extended to lower temperature and lower engine load with a small amount of DTBP additive in RON90 fuel.For all fuels at different engine working conditions, the first ignition phase of HCCI combustion was observed at 850 K, ended at 950 K, and the hot ignition occurred at 1 125 K. The chemical reaction scale time shortens with the increase of DTBP. Therefore the ignition timing advances, the combustion duration shortens, and the combustion efficiency improves at lower engine load. Meanwhile, the UHC and CO emissions decreased sharply with the DTBP addition, while the NO_x emissions remain at a lower level.
Keywords:homogeneous charge compression ignition  additive  high RON fuel  combustion  emission
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