2008•Neiranji gongchengRequires access
Combustion and Emission Characteristics of a HCNG Engine under Various Spark Timings
Fanhua Ma, Yu Wang, Junjun Wang, Liu Hai-quan, Shuli Zhao
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Abstract
An experimental study was conducted on a HCNG spark ignition engine to examine the effects of hydrogen blending ratio(0%~50%) and spark timings on the thermal efficiency,heat release rate,cyclic variations and exhaust emissions of the engine.The results show that hydrogen addition can decrease the spark advanced angle for best torque(MBT) but has no obvious effects on engine thermal efficiency when operating at MBT.As the spark advanced angle increases,flame development duration increases while coefficient of variation(CoV) in peak pressure decreases,rapid burn duration and in indicated mean effective pressure(imep) decreases at beginning and then increases.At fixed spark timing,the above four parameters can simultaneously be improved by adding hydrogen.NOx and CO emissions increase while CH4 emission decreases with the increase of hydrogen blending ratio.