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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/582

Title: Experimental analysis of vegetable oil blends in a compression ignition (CI) engine
Authors: Antwi, Edward
Issue Date: 4-Aug-2008
Abstract: Vegetable oils have been used as possible substitute to diesel in CI engines with the possibility of also reducing harmful exhaust gas emissions. Various blends have been reported by researches in this area as the optimum, giving higher or comparable engine performance. This research considered three locally available but marginally utilized vegetable oils and their respective blends with diesel in CI engines. Physical properties relevant to the fuel industry were determined for the three pure vegetable oils and their respective blends with diesel. A four stroke single cylinder, fixed throttle CI engine was run on blends containing 1, 2, 3, 4, 5, 10, 50 and 100% of the three vegetable oils and diesel to measure their performance characteristics. In terms of cetane index, calorific value and density, jatropha oil came close to diesel than coconut and palm kernel oils. Combustion characteristics and viscosity were higher for jatropha than coconut or palm kernel oil. Even though all three vegetable oils can replace diesel in a CI engine, the performance characteristics of the blends were generally lower than those for diesel. Up to 5% substitution of diesel with coconut or palm kernel oil resulted in Brake Specific Fuel Consumption (BSFC), Brake power output and thermal efficiencies which did not differ significantly from that obtained with diesel. Results obtained for up to 10% substitution of diesel with jatropha did not differ significantly from results obtained for pure diesel in terms of BSFC. In terms of brake power, results for 3% J and 97% diesel did not differ significantly when compared to results for diesel. Smoke density measurements were also lower for all the three vegetable oils and their blends with diesel than that of diesel.
Description: A Thesis submitted to the Department of Mechanical Engineering, Kwame Nkrumah University of Science and Technology in partial fulfillment of the requirements for the degree of Master of Science in Mechanical Engineering, 2008
URI: http://hdl.handle.net/123456789/582
Appears in Collections:College of Engineering

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