Effect of mixer type on cylinder-to-cylinder variation and performance in hydrogen-natural gas blend fuel engine
Effect of mixer type on cylinder-to-cylinder variation and performance in hydrogen-natural gas blend fuel engine
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DOI：
10.1016/j.ijhydene.2013.01.079
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发表时间：
2013-04
影响因子：
7.2
通讯作者：
Cheolwoong Park;S. Lee;Gihun Lim;Y. Choi;Chang-gi Kim
中科院分区：
文献类型：
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作者：
Cheolwoong Park;S. Lee;Gihun Lim;Y. Choi;Chang-gi Kim
压缩天然气（CNG）公交车在城市地区被采用作为一个有前途的替代柴油公交车，其中排放大量的有害排放物。虽然CNG可以满足当前的排放标准，但在没有附加外围设备的情况下满足下一个欧VI排放法规的要求可能是不可能的。使用氢压缩天然气（HCNG）混合物可以帮助减少汽车尾气排放，并通过建设氢基础设施为即将到来的氢经济做好准备。此外，HCNG发动机具有比CNG发动机更高的热效率，产生更少的有害排放物。气缸间的变化影响多缸发动机的运行，并且可以显著地影响HCNG发动机，因为燃料成分和过量空气比的差异可以促成气缸间的变化。在本研究中，使用11-L重型CNG发动机与HCNG（CNG 70体积%，氢气30体积%）燃料的混合器类型上的缸到缸的变化和性能特性的影响进行了研究。混合器类型的改变不影响缸间变化特性和HCNG发动机的燃烧稳定性。由于直列式发动机中气缸的构造，气缸1和6的效率低于其它气缸的效率。在大开度节流操作条件下压降的显著增加使得难以满足发动机的技术规格。
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.