Performance of rapeseed oil blends in a diesel engine. Applied Energy.
The concep that 100Porcentaje vegetable oil cannot be used safely in a direct-injection diessel engine for longs periods of time has been stressed by many researches. Short-term engine tests indicate good potential for vegetable oil fuels. Long-term endurance tests may shows serious problems in injector coking, ring sticking, gum formation, and tickening of lubricating oil. These problems are related to the high viscosity and nonvolatily of vegetable oils, wich cause inadequate fuel atomization and incomplete combustion. Fuel blending is one method of reducing viscosity. This paper presents the results of an engine test on three fuel blends. Test runs were also made on neat rapeseed oil and diesel fuel as bases for comparision. There were no significant Problems with engine operation using these alternative fuels. The test results showed increases in brake thermal efficiecy as the amount of rapeseed oil in the blends increases. Reduction of power output was also noted with increased amount of rapeseed oil in the blends. Test results include data on performance and gaseous emissions. Crankcase oil analyses showed a reduction in viscosity. Friction power was noted to increase as amount of diesel fuel in the blend increases..
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