Abstract
An experimental investigation was performed to analyze the effects of undiluted biodiesel fuel (100% methyl ester of soybean oil) on spray, combustion, and exhaust emissions characteristics in a direct injection (DI) common-rail diesel engine with a cooled-EGR system. The macroscopic and microscopic injection characteristics for test fuels such as injection mass, injection rate, droplet diameter, and spray tip penetration were measured by using an injection rate meter, a spray visualization system, and a droplet measuring system. The study of combustion and exhaust emission characteristics was carried out under various engine operating conditions for biodiesel fuel, and the results were compared to those of ultra low sulfur diesel (ULSD). In this work, the injection characteristics of test fuels such as injection rate and mass results are very similar for diesel and biodiesel fuel derived from soybean oil. However, when comparing the start of injection, biodiesel resulted in short injection delay. The Sau...
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