In this paper, we investigated the effect of water mixed in methanol on the performance of 4-cycle spark ignition engine. The water mixing ratio in methanol was varied from 0 to 30% by weight. Experiments at various excess air ratios were caried out under a constant charging efficiency and engine speed. The mean burning gas temperature in a cylinder was measured with a platinum wire resistor thermometer fixed near the cylinder head. When the excess air ratio was decreased or the amount of water mixed in methanol was increased, the mean temperature in the cylinder decreased and the ratio of burned fuel to supplied fuel decreased. In order to facilitate fuel vaporization, the air fuel mixture was heated, which resulted in an increase in thermal efficiency.
含水メタノール燃料の小形4サイクル式火花点火機関性能に及ぼす影響
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