Effects of hydrogen addition on cycle-by-cycle variations in a lean burn natural gas spark-ignition engine
Effects of hydrogen addition on cycle-by-cycle variations in a lean burn natural gas spark-ignition engine
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DOI：
10.1016/j.ijhydene.2007.10.043
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发表时间：
2008-01-01
影响因子：
7.2
通讯作者：
Ding, Shangfen
中科院分区：
文献类型：
--
作者：
Ma, Fanhua;Wang, Yu;Ding, Shangfen
在一台6缸节气门体喷射天然气发动机上进行了掺氢对点燃式发动机循环变动（CCV）影响的试验研究。两种类型的燃料，CNG和80/20（体积）CNG/氢气混合物，用于比较的目的。结果表明，添加氢气可降低最大压力（P-max）和平均有效指示压力（IMEP）的变异系数（CoV），且随着发动机的进一步倾斜，其正效应更加明显。氢气的加入可以同时降低火焰发展和传播的持续时间以及火焰传播持续时间中的CCV，这些都有利于提高燃烧稳定性，并被认为是CoVimep降低的原因。燃烧相位的稳定性，是至关重要的点火正时优化的有效性也得到改善的氢。同时，氢气的添加也有利于控制NO和未燃HC的排放。因此，在稀燃火花点火发动机中添加氢气是降低CCV的一种有效可行的方法。(C)2007年国际氢能协会。由爱思唯尔有限公司出版。保留所有权利。
An experimental study aimed at examining the effects of hydrogen addition on cycle-by-cycle variation (CCV) in an SI engine was conducted on a 6-cylinder throttle body injection natural gas (NG) engine. Two types of fuels, CNG and 80/20 (in volume) CNG/hydrogen mixtures, were used for comparison purposes. The results showed that coefficient of variation (CoV) in both maximum pressure (P-max) and indicated mean effective pressure (IMEP) could be reduced by hydrogen addition and that positive effect would be more obvious as the engine was further leaned out. The duration of flame development and propagation as well as the CCVs in flame propagation duration could be simultaneously reduced by hydrogen addition, all of which are beneficial to improve combustion stability and thought to be reasons for the reduction in CoVimep. Stability of combustion phasing that is crucial to the effectiveness of ignition timing optimization was also improved by hydrogen. Hydrogen addition was also proved to be good to the control of emission of NO, and unburned HC. Hence it is concluded that hydrogen addition is an effective and applicable approach to keep down CCVs in lean burn spark-ignition engines. (C) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.