Improving thermal efficiency by reducing cooling losses in hydrogen combustion engines
Improving thermal efficiency by reducing cooling losses in hydrogen combustion engines
- New search for: Shudo, Toshio
- New search for: Shudo, Toshio
Hydrogen can be readily used in spark ignition engines as a clean alternative to fossil fuels. However, the higher burning velocity and shorter quenching distance of hydrogen compared with hydrocarbons cause a larger heat transfer from the burning gas to the combustion chamber walls. Because of this cooling loss, the thermal efficiency of hydrogen-fueled engines is sometimes lower than that of conventionally fueled engines. Therefore, reducing the cooling loss is a crucial element in improving the thermal efficiency of hydrogen combustion engines. Previous research by the author and others has proposed the direct injection stratified charge as a technique for reducing the cooling loss in hydrogen combustion and shown its effect in reducing cooling loss through experiments in a constant volume combustion vessel. However, it is known that a reduction in cooling loss does not always improve thermal efficiency due to a simultaneous increase in the exhaust heat loss. This paper explains the relation between cooling loss reduction and thermal efficiency improvements by the direct injection stratified charge in hydrogen combustion engines.
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Improving thermal efficiency by reducing cooling losses in hydrogen combustion engines
Die Verbesserung des thermischen Wirkungsgrades von Wasserstoff-gespeisten Verbrennungsmotoren durch Reduzierung der Kühlverluste
International Journal of Hydrogen Energy ; 32 , 17, Fuel Cells ; 4285-4293
2007
9 Seiten, 12 Bilder, 8 Quellen
Article (Journal)
English
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