Abstract
An experimental study was conducted on a spark ignition engine to investigate the factors that affect the lean combustion limit of hydrogen-natural gas engine. The effects of ignition timing, hydrogen mixing ratio, engine speed, throttle opening, lubricant oil and coolant temperature were examined. The engine speed was 1500-3000 r/min, the throttle opening was 10%-40%, the lubricant temperature was 75°C-95°C, and the coolant temperature was 65°C-85°C during experience. The hydrogen mixing ratio varied from 0 to 40%, and the lean-combustion limit ignition timing was defined and adopted. The result shows that both over-retarded and over-advanced ignition timing would baffle the extension of lean-combustion limit. The lean-combustion limit increases with hydrogen mixing ratio, slightly increases with throttle opening, and decreases when the engine speed is raised. Besides, it decreases with the increase in lubricant temperature. Warming-up coolant is positively related to enlarge the lean-combustion limit.
Original language | English |
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Pages (from-to) | 776-781 |
Number of pages | 6 |
Journal | Binggong Xuebao/Acta Armamentarii |
Volume | 33 |
Issue number | 7 |
Publication status | Published - Jul 2012 |
Keywords
- Hydrogen
- Internal combustion engine
- Lean combustion limit
- Natural gas
- Power mechanical engineering