Effects of the initial flame kernel radius and EGR rate on the performance, combustion and emission of high-compression spark-ignition methanol engine
Effects of the initial flame kernel radius and EGR rate on the performance, combustion and emission of high-compression spark-ignition methanol engine
复制标题
初始火焰核心半径和EGR率对高压缩火花点火甲醇发动机性能、燃烧和排放的影响
DOI：
10.1016/j.fuel.2019.116633
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发表时间：
2020
期刊：
影响因子：
7.4
通讯作者：
Wang Yuxiang
中科院分区：
文献类型：
--
作者：
Zhen Xudong;Li Xiaoyan;Wang Yang;Liu Daming;Tian Zhi;Wang Yuxiang
甲醇作为一种清洁燃料，被认为是最有前途的内燃机替代燃料之一。利用一维仿真软件建立了一台四缸点燃式甲醇发动机的仿真模型。甲醇发动机是由压缩比为17.5的柴油机改装而成的，进气道安装了甲醇喷射器。在发动机转速为2400 r/min的条件下，研究了节气门开度分别为10%、30%、50%、70%和90%时，初始火焰核半径和EGR率对甲醇发动机性能、燃烧和排放的影响。结果表明，在任意节气门开度下，随着EGR率的增加，发动机性能下降，缸内燃烧恶化，NOx排放显著降低，HC和CO排放增加。在任意节气门开度下，随着初始火焰核半径的增大，发动机性能略有下降，燃烧得到了优化。在排放方面，当节气门开度在10%~ 70%之间时，NOx和CO的排放随着初始火焰核半径的增大而降低。当节气门开度为90%时，NOx和CO排放随初始火焰核半径的增大而增大。
As clean fuel, methanol is considered to be one of the most promising alternative to conventional fuels for internal combustion engines. In this paper, a four-cylinder ignited methanol engine simulation model was built by using a one-dimensional simulation software. The methanol engine was converted from a diesel engine with a compression ratio of 17.5, and the methanol injector was installed in the inlet. Setting the engine speed as 2400 r/min, the effects of the initial flame kernel radius and EGR rate on the performance, combustion and emissions of methanol engine were studied when the throttle opening was 10%, 30%, 50%, 70% and 90%, respectively. The results showed that at any throttle opening, with the increase of EGR rate, the performance of the engine decreased, the in-cylinder combustion deteriorated, the NOxemission decreased significantly, but the HC and CO emission increased. At any throttle opening, the engine performance decreased slightly with the increase of the initial flame kernel radius, and the combustion was optimized. In terms of emission, when the throttle opening was between 10% and 70%, the NOxand CO emission decreased with the increase of the initial flame kernel radius. When the throttle opening was 90%, the NOxand CO emission increased with the increase of the initial flame kernel radius.