Numerical analysis on knock for a high compression ratio spark-ignition methanol engine

Numerical analysis on knock for a high compression ratio spark-ignition methanol engine
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高压缩比火花点火甲醇发动机爆震数值分析

DOI:
10.1016/j.fuel.2012.10.023
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发表时间:
2013
期刊:
影响因子:
7.4
通讯作者:
Yongsheng Zhu
Yongsheng Zhu
中科院分区:
工程技术1区
文献类型:
--
作者:
Xudong Zhen;Yang Wang;Shuaiqing Xu;Yongsheng Zhu

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甲醇是一种可替代的、可再生的、环境和经济上有吸引力的燃料。它被认为是内燃机最有利的燃料之一。本文采用FIRE计算流体动力学(CFD)程序对高压缩比火花点火甲醇发动机的爆震进行了模拟和研究。对不同工况下的爆震燃烧进行了模拟。最后,通过对高压缩比火花点火甲醇发动机热效率的分析,研究了点火正时和EGR(Exhaust Gas Recirculation,废气再循环)技术对发动机爆震的抑制效果。结果表明,随着EGR量的增加,发动机的热效率大大降低,爆震发生时刻推迟。与使用低EGR率和晚点火正时相比,使用高EGR率和早点火正时对爆震抑制具有更好的热效率。
Methanol is an alternative, renewable, environmentally and economically attractive fuel. It is considered to be one of the most favorable fuels for internal combustion engines. In this paper, knock in a high compression ratio spark-ignition methanol engine was modeled and investigated using FIRE Code CFD (Computational Fluid Dynamics) calculations. Knocking combustion was simulated under different operating conditions. Finally, the effects of spark timing and EGR (Exhaust Gas Recirculation) techniques for suppressing knock in a high compression ratio spark-ignition methanol engine were studied based on the numerical analysis through the analysis of the thermal efficiency. The results showed that with the increase of the EGR, the thermal efficiency was greatly reduced and the knock occurrence timing was postponed. The use of a high EGR rate and early spark timing had a better thermal efficiency on the knock suppression as compared to the use of a low EGR rate and late spark timing.
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