空冷ディーゼル機関の筒温分布に関する実験

抄録

The influences of cooling conditions on the distribution of cylinder temperature of air cooled diesel engine were investigated, and the following results were obtained.
1. Cylinder temperature rises with the increase of load, and is low on the side (0°) of inlet of cooling air, and is high on the opposite side (225°-1.80°).
It is necessary to be cautioned that the cylinder temperature approaches the extremely high value of 180°C at the full load of 1100-1500rpm, and reaches the highest limit of 200°C only at the full load of 1500rpm.
2. Both rise and distribution of cylinder temperature by the increase of rpm. are not so much influenced as by the load.
3. Cylinder temperature rises with the blockade of the cooling air screen, and is variable with angular position of cylinder wall.
Every one fourth of blockade of the area of cooling air screen, at the angular position (225°-270°) on the upper part of cylinder, rises cylinder temperature by 10°C.
4. Slackness by 10mm of fin cover less influences on the rising of cylinder temperature.
Removal of fin cover at the (90°) side or the both side (90° and 270°) are dangerous due to the extreme rising of cylinder temperature.
5. The blockade of the ditch of cooling fin rises temperature of cylinder wall on the blocked side and lowers it on the opposite side.
The blockade on the (90°) side influences more on rising of temperature than that of (270°) side.
The blockade of the ditch of cooling fin at the inlet of the head-cover rises the temperature of cylinder head, but lowers that of cylinder wall especially at the lower part.
With normally equipped fin cover, cylinder temperature rises slightly at the rear side (180°-225°) so far as the blockade is slight.