Some addenda on the Temperature Coefficient of Diesel Engine output Horse-Power

Abstract

Examining the aspect of combustion processes in the diesel engine cylinder through indicator-cards, we can see the effect of suction-air temperature on the cards, even in light load operation such as the case where the excess air factor is 2∼3, when almost no effect can be felt upon its output horsepower. When we change the suction-air temperature keeping the fuel injection rate constant, the maximum explosion pressure in pre-combustion chamber varies almost proportionally to the quantity of air aspirated, which varies due to the suction-air temperature change. Namely it may be said, that the combustion process in the pre-combustion chamber of diesel engine cylinder is regulated by the quantity of air in it. This will be understood from the fact that even under the condition of light load when the excess air factor is about 3, the excess air factor in regard to the pre-combustion chamber alone will still remain about unity. Anyway, it may by said that the effect of the suction-air temperature upon the combustio