Effect of hydrogen addition on combustion and emissions performance of a spark-ignited ethanol engine at idle and stoichiometric conditions
Effect of hydrogen addition on combustion and emissions performance of a spark-ignited ethanol engine at idle and stoichiometric conditions
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添加氢气对怠速和化学计量条件下火花点火乙醇发动机燃烧和排放性能的影响
DOI：
10.1016/j.ijhydene.2010.06.026
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发表时间：
2010-09
影响因子：
7.2
通讯作者：
Zhang, Bo
中科院分区：
文献类型：
--
作者：
Wang, Shuofeng;Ji, Changwei;Zhang, Bo
考虑到化石燃料储量有限，可再生乙醇被认为是火花点火发动机的替代燃料之一。但由于乙醇的高潜热，在低温下，例如在怠速状态下，乙醇通常很难被很好地蒸发以形成均匀的燃料-空气混合物。与乙醇相比，氢气具有许多独特的燃烧和物理化学性质，有助于改善燃烧过程。本文研究了一台富氢汽油乙醇发动机在怠速和化学计量比条件下的性能。试验是在一台改装的1.6缸L点燃式发动机上进行的，发动机配备了氢气喷射系统。乙醇是使用原发动机汽油喷射系统注入进气口的。采用自行开发的混合电子控制单元(HECU)控制氢气和乙醇喷射器的开启和关闭。点火正时和怠速旁路阀开度由发动机原始电子控制单元(OECU)控制，因此发动机可以在每个测试点的原始目标怠速下运行。发动机首先燃用纯乙醇，然后随着氢气喷射时间的延长，氢在总进气中的体积分数逐渐增加。对于特定的氢气添加水平，降低乙醇流量以保持氢-乙醇-空气混合物的化学计量条件。试验结果表明，掺氢能有效地减小乙醇发动机怠速时的循环波动，提高发动机的指示热效率。当进气中氢体积分数从0%增加到6.38%时，燃料能量流率降低了20%。随着掺氢比的增加，火焰发展和传播周期均缩短。氢气的加入降低了冷却剂的换热，提高了定容燃烧程度。随着掺氢比例的增加，HC和CO排放呈现先降低后增加的趋势。富氢乙醇发动机的乙醛排放量低于纯乙醇发动机。然而，在怠速和化学计量条件下，添加氢气会增加乙醇发动机的NOx排放。
Regarding the limited fossil fuel reserves, the renewable ethanol has been considered as one of the substitutional fuels for spark ignition (SI) engines. But due to its high latent heat, ethanol is usually hard to be well evaporated to form the homogeneous fuel–air mixture at low temperatures, e.g., at idle condition. Compared with ethanol, hydrogen possesses many unique combustion and physicochemical properties that help improve combustion process. In this paper, the performance of a hydrogen-enriched SI ethanol engine under idle and stoichiometric conditions was investigated. The experiment was performed on a modified 1.6 L SI engine equipped with a hydrogen port-injection system. The ethanol was injected into the intake ports using the original engine gasoline injection system. A self-developed hybrid electronic control unit (HECU) was adopted to govern the opening and closing of hydrogen and ethanol injectors. The spark timing and idle bypass valve opening were governed by the engine original electronic control unit (OECU), so that the engine could operate under its original target idle speed for each testing point. The engine was first fueled with the pure ethanol and then hydrogen volume fraction in the total intake gas was gradually increased through increasing hydrogen injection duration. For a specified hydrogen addition level, ethanol flow rate was reduced to keep the hydrogen–ethanol–air mixture at stoichiometric condition. The test results showed that hydrogen addition was effective on reducing cyclic variations and improving indicated thermal efficiency of an ethanol engine at idle. The fuel energy flow rate was reduced by 20% when hydrogen volume fraction in the intake rose from 0% to 6.38%. Both flame development and propagation periods were shortened with the increase of hydrogen blending ratio. The heat transfer to the coolant was decreased and the degree of constant volume combustion was enhanced after hydrogen addition. HC and CO emissions were first reduced and then increased with the increase of hydrogen blending fraction. The acetaldehyde emission from the hydrogen-enriched ethanol engine is lower than that from the pure ethanol engine. However, the addition of hydrogen tended to increase NOxemissions from the ethanol engine at idle and stoichiometric conditions.
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影响因子：
7.2
作者：
Ma, Fanhua;Wang, Yu;Ding, Shangfen
通讯作者：
Ding, Shangfen
影响因子：
7.2
作者：
Fanhua Ma;Yu Wang;Haiquan Liu;Yong Li;Junjun Wang;Shuli Zhao
通讯作者：
Fanhua Ma;Yu Wang;Haiquan Liu;Yong Li;Junjun Wang;Shuli Zhao
影响因子：
7.2
作者：
H. A. K. S. Al-Janabi;M. Al-Baghdadi
通讯作者：
H. A. K. S. Al-Janabi;M. Al-Baghdadi
DOI：
10.4271/940987
发表时间：
1994-03
期刊：
SAE transactions
影响因子：
--
作者：
Nir Ozdor;M. Dulger;E. Sher
通讯作者：
Nir Ozdor;M. Dulger;E. Sher
影响因子：
7.2
作者：
Ji, Changwei;Wang, Shupfeng
通讯作者：
Wang, Shupfeng