This paper examines the possibility of combustion similarity in diesel engines by computer simulation. In a previous work the authors analyzed fundamental equations which govern combustion phenomena in diesel engines, and predicted the possibility of combustion similarity in different-sized diesel engines. The numerical analysis was performed with a 3-D simulation program, KIVA, with some modifications. Comparison was made for engines with bore sizes from 125 to 400 mm at various conditions of combustion chamber configuration, injection speed, swirl speed, and engine revolution. The results showed good agreement with the theoretical prediction. Development of temperature and fuel concentration distributions was very similar when theoretically predicted conditions necessary for the similarity were established.
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