The effects of hydrogen addition on engine power and emission in DME premixed charge compression ignition engine
The effects of hydrogen addition on engine power and emission in DME premixed charge compression ignition engine
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DOI：
10.1016/j.ijhydene.2012.09.177
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发表时间：
2013-01
影响因子：
7.2
通讯作者：
J. Jeon;C. Bae
中科院分区：
文献类型：
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作者：
J. Jeon;C. Bae
在单缸压燃式发动机上进行了二甲醚(DME)双喷射预混压燃(PCCI)试验研究。二甲醚的主喷射被氢气取代，以减少二氧化碳排放。为了研究氢气的影响，增加了氢气的注入量。比较了二甲醚PCCI燃烧和氢气-DME PCCI燃烧的发动机性能和排放。在二甲醚PCCI发动机的工作中，首先在上止点后的−120度曲轴转角(°CA)处直接向缸内喷射二甲醚以模拟均质充气，然后以不同的二次喷射定时进行二次喷射。在这种情况下，二甲醚喷射正时在第二阶段影响发动机的性能和排放。延迟燃烧阶段表现出较高的指示平均有效压力(IMEP)，但延迟二次喷射会增加NOx的排放。在氢-二甲醚PCCI中，氢气以固定的喷射定时在进气口喷射。氢-二甲醚PCCI燃烧中的二甲醚喷射定时也从−120°CA到TDC变化，就像在二甲醚PCCI发动机运行中一样。所有情况下的总供热值都固定在400J。二甲醚喷射定时决定了氢-二甲醚PCCI的燃烧开始。随着氢气量的增加，尾气排放减少。氢-二甲醚PCCI发动机通过氢气添加和二甲醚喷射正时控制，以最少的二甲醚用量运行。优化的二甲醚喷射正时，−30°CA ATDC，在保持较高IMEP值的同时，实现了较低的排放操作。
Premixed-charge compression-ignition (PCCI) combustion of dimethyl-ether (DME) with double injection strategy was investigated in a single-cylinder compression-ignition engine. DME main-injection was replaced by hydrogen to reduce carbon dioxide emissions. To study the effect of hydrogen, the injected amount of hydrogen was increased. Engine performance and emission of DME PCCI combustion were compared to those of hydrogen–DME PCCI combustion. In the DME PCCI engine operation, DME was injected directly into the cylinder at −120 crank angle degrees (°CA) after top dead center (aTDC) to simulate homogeneous charge at first, and then DME was injected secondly with varied second injection timing. In this case, DME injection timing in the second stage affected the engine performance and emissions. Delayed combustion phase showed a higher indicated mean effective pressure (IMEP), while it increased NOxemission when DME second injection is retarded. In the hydrogen–DME PCCI, hydrogen was injected at intake port with fixed injection timing. DME injection timing in hydrogen–DME PCCI combustion was also varied from −120 °CA to TDC, as in the DME PCCI engine operation. The total supplied heating value was fixed at 400 J for all cases. DME injection timing determined the start of combustion for the hydrogen–DME PCCI. With increasing the amount of hydrogen, exhaust emissions were reduced. Hydrogen–DME PCCI engine was operated with minimum amount of DME via the hydrogen addition and DME injection timing control. The optimized DME injection timing, −30 °CA aTDC, resulted in a lower exhaust emission-operation, while maintaining a higher IMEP.