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Improving thermal efficiency by reducing cooling losses in hydrogen combustion engines
| Title: | Improving thermal efficiency by reducing cooling losses in hydrogen combustion engines |
| Authors: | Shudo, Toshio Browse this author |
| Keywords: | Hydrogen engine | | Thermal efficiency | | Cooling loss | | Exhaust loss | | Stratified charge | | Combustion |
| Issue Date: | Dec-2007 |
| Publisher: | Elsevier Ltd. |
| Journal Title: | International Journal of Hydrogen Energy |
| Volume: | 32 |
| Issue: | 17 |
| Start Page: | 4285 |
| End Page: | 4293 |
| Publisher DOI: | 10.1016/j.ijhydene.2007.06.002 |
| Abstract: | 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. |
| Relation: | http://www.sciencedirect.com/science/journal/03603199 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/30295 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 首藤 登志夫
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