Abstract
In order to understand the effects of unsaturated fatty acid compositions on biodiesel combustion, the combustion characteristics and exhaust emissions of high oleic safflower oil methyl ester (SFME_<HO>), high linoleic safflower oil methyl ester (SFME_<HL>) and linseed oil methyl ester (LME) are investigated using a direct injection diesel engine, and are compared with JIS no. 2 gas oil. As a result, the all ester test fuels have same thermal efficiency compared with the gas oil. Also, the all ester test fuels have higher NO_x emission and lower smoke emission at high load condition compared with the gas oil. From the experimental results of test ester fuels, it is concluded that with higher amounts of more unsaturated fatty acid methyl ester, biodiesel has lower kinematic viscosity and lower oxidation stability, and has longer ignition delay at all load conditions, higher HC and CO emissions at low load condition and higher NO_x emission at high load condition.
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