Autoignition and detonation development induced by a hot spot in fuel-lean and CO2 diluted n-heptane/air mixtures
Autoignition and detonation development induced by a hot spot in fuel-lean and CO2 diluted n-heptane/air mixtures
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贫燃料和二氧化碳稀释的正庚烷/空气混合物中的热点引起的自燃和爆炸发展
DOI：
10.1016/j.combustflame.2018.12.020
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发表时间：
2019-03
影响因子：
4.4
通讯作者：
Gan Xiaohua
中科院分区：
文献类型：
--
作者：
Dai Peng;Chen Zheng;Gan Xiaohua
贫燃料或稀释燃烧广泛用于先进的内燃机（ICE），例如均质充量压缩点火（HCCI）发动机、低温燃烧（LTC）发动机和利用废气再循环（EGR）的发动机。内燃机热效率受到尾气自燃和爆轰发展引起的爆震和超爆震的制约。因此，本文采用数值模拟的方法研究了当量比和CO2稀释对热点诱导自燃和爆轰发展的影响。结果表明，降低当量比和增加CO2稀释比均能显著增加激发时间，降低总放热。在贫燃料或稀释程度较高的条件下，化学反应与压力波之间的相互作用减弱，爆轰发展倾向降低。不同的自燃模式被识别和量化。激发时间在化学声相互作用和爆轰发展中起着控制作用。结果表明，在相同的激发时间下，降低当量比和增加CO2稀释度对自燃模式的影响是相同的。此外，还得到了不同条件下正庚烷和二甲醚的爆轰发展规律，并进行了比较。无量纲参数以及量化的爆轰发展制度的确定和讨论。
Fuel-lean or diluted combustion is widely used in advanced internal combustion engines (ICEs) such as homogeneous charge compression ignition (HCCI) engines, low temperature combustion (LTC) engines, and engines utilizing exhaust gas recirculation (EGR). The thermal efficiency of ICEs is constrained by knock and super-knock due to end-gas autoignition and detonation development. Therefore, the effects of equivalence ratio and CO2dilution on autoignition and detonation development induced by a hot spot are numerically investigated here. It is found that the decrease of equivalence ratio and increase of CO2dilution ratio can both greatly increase the excitation time and reduce the total heat release. Under fuel-leaner or more diluted conditions, the interaction between chemical reaction and pressure wave becomes weaker and thereby the propensity of detonation development is lower. Different autoignition modes are identified and quantified. The excitation time is shown to play a controlling role in the chemical-acoustic interaction and detonation development. It is demonstrated that reducing equivalence ratio and increasing CO2dilution have the same influence on the autoignition mode if the same excitation time is maintained. Furthermore, the detonation development regimes for n-heptane and dimethyl ether at different conditions are obtained and compared. Non-dimensional parameters used to well quantify the detonation development regime are identified and discussed.
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DOI：
10.1103/physreve.85.056312
发表时间：
2012-05
期刊：
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子：
--
作者：
M. Liberman;A. Kiverin;M. F. Ivanov
通讯作者：
M. Liberman;A. Kiverin;M. F. Ivanov
影响因子：
4.4
作者：
H. Terashima;M. Koshi
通讯作者：
H. Terashima;M. Koshi
影响因子：
4.4
作者：
A. Robert;S. Richard;O. Colin;T. Poinsot
通讯作者：
A. Robert;S. Richard;O. Colin;T. Poinsot
影响因子：
29.5
作者：
J. F. Clarke
通讯作者：
J. F. Clarke
DOI：
10.1016/j.proci.2016.07.054
发表时间：
2017
期刊：
--
影响因子：
--
作者：
Khanh Cung;A. Moiz;Xiucheng Zhu;Seong-Young Lee
通讯作者：
Khanh Cung;A. Moiz;Xiucheng Zhu;Seong-Young Lee