EXPERIMENTAL INVESTİGATIONS ON EMISSIONS CHARACTERISTICS OF A VARIABLE COMPRESSİON RATIO ENGINE OPERATED ON DUAL FUEL MODE USING DIESEL AND BIODIESEL (OBTAINED FROM COTTON SEED OIL AND RICE BRAN OIL)

• Main Authors: Sundar. K, R., Shashank
• Format: Article
• Language: English
• Published: Zibeline International 2018-09-01
• Series: Journal of Mechanical Engineering Research and Developments
• Subjects: Compression Ratio; Compression Ignition; Methyl Ester Cotton Seed Oil; Methyl Ester Rice Bran Oil
• Online Access: https://jmerd.org.my/Paper/Vol.%2041%2C%20No.%203%20%282018%29/59-66.pdf

The global consumption of fossil fuels is increasing rapidly, and it affects the environment through greenhouse gases causing health hazards. Biodiesel has a great potential to reduce environmental pollution as an alternative fuel for diesel engines. The aim of the present study is to analyze and investigate the optimum compression ratio, optimum blend and engine emissions. Experiments were conducted on a single-cylinder, four-stroke, variable compression ratio and compression ignition engine was operated on a dual fuel mode with diesel and biodiesel obtained from cotton seed oil and rice bran oil and its blends of B5, B10, B15 and B20 at constant speed of 1500 rpm, different compression ratios of 15, 16, 17, 18 and varying the loads. When the various proportions of biodiesel are mixed with the diesel, the equal amounts of Methyl Ester Cotton Seed Oil and Methyl Ester Rice Bran Oil are mixed together and used along with pure diesel. Engine emission results indicated that the biodiesel blend B20 reduced the average emissions of carbon monoxide and hydrocarbon by 21.9% and 4.0% respectively. However, biodiesel blend B20 slightly increased emissions of carbon dioxide and oxides of nitrogen by 16.3% and 8.6% respectively compared to diesel. When compression ratio was increased from 15 to 18, the CO and HC emission decreased drastically, and CO2 and NOx emission increased considerably. From the present study, it is concluded that blend B20 and CR18 operates much inferior to diesel with respect to emissions. B20 blend may replace diesel fuel without modifying engines to produce cleaner exhaust emissions.