メタノールを用いた2ストローク機関における希薄燃焼の安定性

概要

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This paper proposes a method to estimate the stable combustion limit in a conventional engine because of its increased importance, and this method is applied to the study of combustion stability in a two-stroke cycle engine fueled with methanol. Fluctuating ratios of indicated mean effective pressure and maximum pressure in the cylinder on a two-stroke cycle engine are defined and applied to estimate the combustion stability. The stable combustion limit can be estimated from maximum pressure versus crank angle diagram, since on the diagram, distribution area of maximum pressure included no misfiring cycles are different from that included misfiring cycles. In case of the stable combustion, fluctuating ratio of maximum pressure is within 10%. This value corresponds to the indicated mean effective pressure fluctuating ratio of about 5%. In consequence of the above, it is shown that the range of excess air ratio for the stable combustion using methanol fuel increases toward lean side in comparison with gasoline. Also at the same excess air ratio, the lower limit of delivery ratio and the upper limit of engine speed for the stable combustion can be improved by using methanol fuel.
社団法人日本機械学会の論文
1998-12-25