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 1 500-3 000 r/min, the throttle opening was 10%-40%, the lubricant temperature was 75 ℃-95 ℃,and the coolant temperature was 65 ℃-85 ℃ 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.
Key words
power mechanical engineering /
natural gas /
hydrogen /
internal combustion engine /
lean combustion limit
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Footnotes
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