Experimental and surrogate modeling study of gasoline ignition in a rapid compression machine
Experimental and surrogate modeling study of gasoline ignition in a rapid compression machine
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DOI：
10.1016/j.combustflame.2012.05.008
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发表时间：
2012-10-01
影响因子：
4.4
通讯作者：
Pitz, William J.
中科院分区：
文献类型：
--
作者：
Kukkadapu, Goutham;Kumar, Kamal;Pitz, William J.
汽油在均质压燃发动机中的使用推动了更好地了解汽油在类似发动机的条件下的压燃过程的必要性。为了量化低温放热，并为化学动力学模型提供基本的验证数据，研究良好控制条件下的自燃现象势在必行。然而，在低温条件下，自燃延迟期的数据却非常缺乏。认识到在高压和中低温度下需要动力学信息，本工作旨在通过在快速压缩机(RCM)上进行汽油自燃的实验研究来填补这一空白，以表征在压缩压力为20巴和40巴、当量比从0.3到1.0的大范围压缩温度下汽油和空气混合物的点火响应。RCM实验的结果也用一个包括正庚烷、异辛烷、甲苯和2-戊烯的四组分汽油替代物模型进行了模拟。在所研究的条件下，实验和四组分替代模型在第一阶段点火延迟时间和总点火延迟时间以及测量和模拟的压力迹线的比较方面都表现出很好的一致性。进一步进行了动力学分析，以了解汽油中存在的不同烃类在控制自燃中的作用。(C)2012年，燃烧研究所。爱思唯尔公司出版，版权所有。
The use of gasoline in Homogeneous Charge Compression Ignition engines has propelled the need to better understand compression ignition processes for gasoline under engine-like conditions. In order to quantify low-temperature heat release and to provide fundamental validation data for chemical kinetic models, it is imperative to study autoignition phenomena under well-controlled conditions. However, there is a significant lack of autoignition delay data in the low temperature regime. Recognizing the need for kinetic information at high pressures and low-to-intermediate temperatures, this work aims to fill this void by conducting an experimental study of gasoline autoignition in a Rapid Compression Machine (RCM) to characterize the ignition response of gasoline + air mixtures over a wide range of compression temperatures at compression pressures of 20 and 40 bar with equivalence ratios ranging from 0.3 to 1.0. Results from the RCM experiments are also simulated using a four-component gasoline surrogate model which includes n-heptane, iso-octane, toluene, and 2-pentene. For the conditions investigated, good agreement between the experiments and the four-component surrogate model, in terms of first-stage and total ignition delay times as well as the comparison of measured and simulated pressure traces, is demonstrated. Kinetic analysis is further conducted to understand the role of the different hydrocarbon classes present in gasoline in controlling autoignition. (c) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.