Heat Release Analysis on Combustion and Parametric Study on Emissions of HCCI Engines Fueled with 2-Propanol/n-Heptane Blend Fuels

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• 作者：L&uuml ; Xingcai ; Hou Yuchun ; Ji Libin ; Zu Linlin ; Huang Zhen
• 刊名：Energy & Fuels
• 出版年：2006
• 出版时间：September 2006
• 年：2006
• 卷：20
• 期：5
• 页码：1870 - 1878
• 全文大小：343K
• 年卷期：v.20,no.5(September 2006)
• ISSN：1520-5029

文摘

This article investigates the inhibition effects of a 2-propanol additive on n-heptane homogeneous chargecompression ignition (HCCI) combustion, analyzes the relationship between the emissions with the combustionparameters and fuel component, and evaluates the influence of cold exhaust gas recirculation (EGR) on HCCIcombustion and emissions. The experiments were conducted on a single-cylinder HCCI engine using neatn-heptane and 10~60% (by volume) 2-propanol/n-heptane blend fuels at 1800 rpm. The experimental resultsreveal that the ignition timing of the low-temperature reaction (LTR) is retarded, and the peak values of heatrelease during the LTR are decreased with an increase of 2-propanol in blend fuels. As a result, the ignitiontiming of the high-temperature reaction is delayed, both the maximum and lowest indicated mean efficientpressures (IMEP) are increased, and the combustion efficiency is also decreased. Parametric studies on COand HC emissions show that the fuel volume with a high cetane number plays a major role in HC emissions.While the main parameter which has an important influence on CO emission is the maximum combustiontemperature, other parameters including pressure rising rate, IMEP, and ignition timing have an indirect effecton CO emission. Moreover, the fuel component shows little effect on CO emissions. In the case of the operationstability of HCCI combustion, at a fixed fuel supplied energy for each cycle, the cycle-to-cycle variations ofthe maximum combustion pressure and its corresponding crank angle and ignition timing deteriorated with thean increase of the 2-propanol additive. Furthermore, EGR illustrates a substantial influence on the combustionand emissions of n-heptane for HCCI combustion doped with a high volume of the 2-propanol additive.