Abstract
Effects of cetane index of fuel on engine performances and exhaust emissions were studied by using a single cylinder diesel engine. Start up tests were carried on various fuels of cetane indexes from 35 to 60. In the case of cetane index of 40 or less, start up periods have been lengthened, and exhaust emissions such as white smoke, CO and hydrocarbon have increased. At the low load operation, combustion was deteriorated resulting from the excess ignition delay when fuel's cetane index was 40 or less. On the other hand, the condition of high load operation, NOx emission and noise were increased with decreasing cetane index. These are due to the high rate of combustion pressure rise just when the violent premixed combustion caused by long ignition delay occurred. It has been understood that various influences appear remarkably when cetane indexes below 40 or 45 for high speed diesel engines.
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