Effect of mixer type on cylinder-to-cylinder variation and performance in hydrogen-natural gas blend fuel engine

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• 作者：Cheolwoong Park^a ; ^{cwpark@kimm.re.kr} ; Sungwon Lee^a ; ^{swlee@kimm.re.kr} ; Gihun Lim^b ; ^{lgh0302@ust.ac.kr} ; Young Choi^a ; ^{ychoi@kimm.re.kr} ; Changgi Kim^a ; ^{cgkim@kimm.re.kr} ; ^{parkaist@nate.com}
• 关键词：Hydrogen-natural gas blends (HCNG) ; Gas mixer ; Cylinder-to-cylinder variation ; Mixture distribution ; Combustion stability ; Full load performance
• 刊名：International Journal of Hydrogen Energy
• 出版年：2013
• 出版时间：15 April, 2013
• 年：2013
• 卷：38
• 期：11
• 页码：4809-4815
• 全文大小：727 K

文摘

Compressed natural gas (CNG) buses were adopted in urban areas as a promising alternative to diesel buses, which emitted plenty of harmful emissions. Although CNG can meet the current emission standards, satisfying the requirements of the next EURO-VI emission regulation without an additional peripheral device may be impossible. The use of a hydrogen-compressed natural gas (HCNG) blend can help achieve a reduction in automotive exhaust emissions as well as prepare for an upcoming hydrogen economy through the construction of hydrogen infrastructure. Moreover, an HCNG engine has higher thermal efficiency than a CNG engine, producing lesser harmful emissions.

Cylinder-to-cylinder variation affects multicylinder engine operation and can considerably influence an HCNG engine because fuel composition and excess air ratio differences can contribute to cylinder-to-cylinder variations. In the present study, the effect of the mixer type on cylinder-to-cylinder variation and performance characteristics were investigated using an 11-L heavy-duty CNG engine fuelled with HCNG (CNG 70?vol % , hydrogen 30?vol % ). A change in the mixer type does not affect the characteristics of cylinder-to-cylinder variation and the combustion stability of the HCNG engine. The efficiency of cylinders 1 and 6 is lower than that of the other cylinders because of the configuration of the cylinder in the in-line-type engine. The significant increase in the pressure drop under a wide open-throttle operating condition makes it difficult to satisfy the engine's specifications.