Experimental and Modeling Studies on Ignition Delay Times of Methyl Hexanoate/n-Butanol Blend Fuels at Elevated Pressures

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• 作者：Yue Wang ; Zheng Yang ; Xin Yang ; Dong Han ; Zhen Huang ; Xingcai Lu
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：August 21, 2014
• 年：2014
• 卷：28
• 期：8
• 页码：5515-5522
• 全文大小：705K
• ISSN：1520-5029

文摘

Ignition delay times for n-butanol/methyl hexanoate blend fuels under an O₂/N₂ atmosphere were measured in a rapid compression machine at compressed pressures of 11, 15, and 20 bar with a compressed temperature between 660 and 830 K. A kinetic model for n-butanol/methyl hexanoate fuel blends was built to predict the ignition delay and simulate the combustion process. The main reaction pathways involved in the oxidation process of fuel blends under low鈥搈edium-temperature ranges were recognized. Over the conditions researched in this study, ignition delay of fuel blends showed three-stage oxidation, namely, cool flame, negative temperature coefficient range, and high-temperature oxidation. It is found that the ignition delay times of fuel blends decrease with the increase of the pressure at top dead center and the proportion of n-butanol in blend fuel. Both methyl hexanoate and n-butanol show two-stage heat release in a low compressed temperature range and single-stage heat release in a high-temperature range. n-Butanol has a suppressing effect on the reaction pathways of methyl hexanoate in low-temperature oxidation and a slight effect in high-temperature oxidation.