Biodiesel combustion in an optical HSDI diesel engine under low load premixed combustion conditions
Biodiesel combustion in an optical HSDI diesel engine under low load premixed combustion conditions
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DOI：
10.1016/j.fuel.2009.02.033
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发表时间：
2009-11-01
期刊：
影响因子：
7.4
通讯作者：
Lee, Chia-fon
中科院分区：
文献类型：
--
作者：
Fang, Tiegang;Lin, Yuan-Chung;Lee, Chia-fon
在一台光学接近的单缸高速直喷式柴油机上，研究了不同喷射策略下生物柴油混合燃料的喷雾和燃烧过程。实验结果表明，燃烧放热以预混燃烧为主，放热速率峰值随喷油时间延迟而变小。随着生物柴油含量的增加，着火和放热速率峰值出现的时间较晚。在所有试验条件下，都观察到燃料撞击壁面。随着生物柴油含量的增加，液体穿透时间变长，燃料撞击变强。较早和较晚的喷射定时会导致火焰亮度降低，这是因为点火延迟时间较长，改善了混合效果。对于所有的喷射时间，生物柴油混合燃料的碳烟光度比纯柴油燃料的要低。此外，采用延迟后TDC喷射策略的预混燃烧模式显著降低了NOx排放。(C)2009爱思唯尔有限公司。保留所有权利。
An optically accessible single-cylinder high-speed direct-injection (HSDI) diesel engine was used to investigate the spray and combustion processes for biodiesel blends under different injection strategies. The experimental results indicated that the heat release rate was dominated by a premixed combustion pattern and the heat release rate peak became smaller with injection timing retardation. The ignition and heat release rate peak occurred later with increasing biodiesel content. Fuel impingement on the wall was observed for all test conditions. The liquid penetration became longer and the fuel impingement was stronger with the increase of biodiesel content. Early and late injection timings result in lower flame luminosity due to improved mixing with longer ignition delay. For all the injection timings, lower soot luminosity was seen for biodiesel blends than pure diesel fuel. Furthermore, NOx emissions were dramatically reduced for premixed combustion mode with retarded post-TDC injection strategies. (C) 2009 Elsevier Ltd. All rights reserved.