The basis of a knock-prediction model was discussed, which was developed previously for SI (spark ignition) methane engine applications and modified and extended to consider hydrogen engines. The effect of the associated wide ranges possible in operating conditions including a wide range of equivalence ratio, on the onset of knock, combustion duration, power efficiency and operational limits were investigated. The predicted results were compared to corresponding experimental results obtained with a variable compression ratio single-cylinder CFR engine. The effects of changes in some of the key operating parameters of the SI engine, such as CR, intake temperature and spark timing on the onset of the knock when operated on hydrogen were presented and discussed. The role of the presence of carbon monoxide or methane were also considered. Some guidelines for knock-free operation of engines running on hydrogen were presented.
Knock in spark ignition hydrogen engines
International Journal of Hydrogen Energy ; 29 , 8 ; 859-865
2004
7 Seiten, 14 Bilder, 11 Quellen
Article (Journal)
English
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