Investigation on the cold start characteristics of a hydrogen-enriched methanol engine
Investigation on the cold start characteristics of a hydrogen-enriched methanol engine
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DOI：
10.1016/j.ijhydene.2014.04.012
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发表时间：
2014-09
影响因子：
7.2
通讯作者：
Bo Zhang;C. Ji;Shuofeng Wang;Yuchen Xiao
中科院分区：
文献类型：
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作者：
Bo Zhang;C. Ji;Shuofeng Wang;Yuchen Xiao
通过实验研究了添加氢气对甲醇发动机冷启动性能的影响。测试是在一台改装的四缸汽油发动机上进行的。采用电控喷氢系统实现了进氢口喷氢。发动机在25℃的环境温度下启动，氢气流量分别为0和189dm3/S。结果表明，在发动机冷启动过程中，添加氢气有利于提高发动机的峰值转速和气缸压力。加入氢气后，火焰发展和传播周期均缩短。当氢气体积流量从0提高到189时，从S冷启动开始算起，19小时内的HC、CO和颗粒物排放总量分别下降了68.7%、75.2%和72.4%。然而，由于缸内温度的提高，加入氢气后，NOx排放增加。
This paper experimentally investigated the effect of hydrogen addition on the cold start performance of a methanol engine. The test was conducted on a modified four-cylinder gasoline engine. An electronically controlled hydrogen injection system was applied to realize the hydrogen port injection. The engine was started at an ambient temperature of 25 °C with two hydrogen flow rates of 0 and 189 dm3/s, respectively. The results demonstrated that hydrogen addition availed elevating the peak engine speed and cylinder pressure during the cold start. Both flame development and propagation periods are shortened after the hydrogen addition. When the hydrogen volume flow rate was raised from 0 to 189 dm3/s, HC, CO and total number of particulate emissions within 19 s from the onset of cold start were reduced by 68.7%, 75.2% and 72.4%, respectively. However, because of the enhanced in-cylinder temperature, NOxemissions were increased after the addition of hydrogen.