抄録
Today the auxiliary diesel engines on the ship use the degraded fuel oil of 3500 sec or equivalent Redwood No. 1 at 100°F.
The authors have conducted a study on the reliability and the durability of small or mediumsized medium speed diesel engines burning the low grade fuel oils.
In order to evaluate the combustion tests of degraded fuels, the ignition lag and the combustion mode of those fuels are analyzed by the combustion pressure measured at the fire side of the combustion chamber.
The test engine is medium speed engine with 240 mm bore. The maximum power is 1125 PS at 720 rpm.
The test fuels are light cycle gas oil (LCGO) from catalystic cracking units, and residual low grade heavy fuel of 3500 sec or equivalent RW. No. 1 at 100°F from the vacuum distillation etc.
It is confirmed that the ignitability of LCGO and the combustion characteristics of residual low grade heavy fuel are inferior to those of marine diesel oil from the straight distillation.
