小形ディーゼル機関による低セタン指数燃料の燃焼

概要

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In the recent years, it has been supposed a difficult circumstance to maintain good properties of the marine diesel oil since the increasing of a demand for middle distillates of petroleum products. Especially on a small sized high speed diesel engine used in a fishing boat, these will be serious problems caused by low cetane index fuel blended with cracked gas oil.<BR>The performance of starting mobility and the combustion analysis of diesel engine related with cetane index, from 30 to 61, of fuel were examined in details by the experimental study in the case of small high speed engines for coastal fishing boats. As a result, the performance of starting up of the engine was remarkably influenced by cetane index of fuel. The period for starting was long in low cetane index fuel (particularly less than 45) . And also the fluctuate of engine speed was larger with decrease in cetane index just after starting up. Interestingly, the smoke density of exhaust gas was dwindled with decrease in cetane index of fuel. It was interpreted in terms of a tendency of reduction for the period of combustion of the low cetane index fuel.<BR>The following conclusion was obtained from this study: cetane index of the marine diesel oil is required to keep above 45 for the small high speed diesel engine.
社団法人日本マリンエンジニアリング学会の論文