Hydrogen as an ignition-controlling agent for HCCI combustion engine by suppressing the low-temperature oxidation
Hydrogen as an ignition-controlling agent for HCCI combustion engine by suppressing the low-temperature oxidation
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DOI：
10.1016/j.ijhydene.2006.12.002
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发表时间：
2007-09
影响因子：
7.2
通讯作者：
T. Shudo;Hiroyuki Yamada
中科院分区：
文献类型：
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作者：
T. Shudo;Hiroyuki Yamada
与传统燃烧系统相比，均质装药压缩点火（HCCI）燃烧使内燃机获得更高的热效率和更低的nox排放。根据工况控制点火正时是利用HCCI内燃机的关键。已知添加含氢气体可显著延缓二甲醚（DME）的自燃。氢气的有效点火控制可以扩大等量比和发动机负荷在HCCI燃烧中的工作范围。通过化学动力学分析，探讨了点火控制的机理。结果表明，二甲醚的缓燃是由于二甲醚在低温氧化过程中氢对OH的消耗所致。OH浓度的降低导致热释放迟缓，并延迟高温氧化的发生。
Homogeneous charge compression ignition (HCCI) combustion enables internal combustion engines to achieve higher thermal efficiency and lower NOxemission than with conventional combustion systems. Controlling the ignition timing in accordance with the operating conditions is crucial for utilizing HCCI combustion engines. Adding hydrogen-containing gas is known to retard the autoignition of dimethyl ether (DME) considerably. The effective ignition control by hydrogen can expand the operation range of equivalence ratios and engine loads in HCCI combustion. This research investigated the mechanisms in the ignition control by the chemical kinetics analysis. The results show that the retarded ignition can be attributed to a consumption of OH by hydrogen during low-temperature oxidation of DME. The decreased OH concentration leads to retarded heat release and delays the onset of the high-temperature oxidation.