EMISSION ANALYSIS OF BIO-DIESEL BLENDS ON VARIABLE COMPRESSION RATIO ENGINE

Rupesh L. Raut, Babaso N. Naik, Shekhar D. Thakare, Amol A. Gawali

Abstract: Biodiesel is the first and only alternative fuel to have a complete evaluation of emissions results and potential health effects submitted to the US EPA under the Clean Air Act 211 Both Tier I and Tier II have been completed as per the attached package. A large number of experimental studies are reported to study the thermal performance of biodiesels used in diesel engines operated at constant compression ratio and constant injection pressure. In these studies the effect of load, blend, speed, injection timing, brake power, etc on thermal performance and emission characteristics are studied. The fields of optimization on VCRE performance at various CR have emerged as areas of research in recent times. It is found that very few studies are reported in these areas. Therefore the present work is carried out multi-objective optimization on engine exhaust emissions based on compression ratio, load, and blend to find the optimum operating conditions. Based on experimental study, it can be concluded that with increase in CR, the performance of diesel engine operated using Jatropha blends approach to that operated using Diesel And at higher CR, the thermal performance of Jaropha biodiesel blends is closest to that of diesel compared to operate at other CRs of 14, 15, and 16. Thus, the best combination of input parameter in term of CR will be 17 to 18 when engine is operated at full load. The experiment however can not specify any optimum Jatropha biodiesel blend that will simultaneously maximize thermal performance and minimize emission constituents. Although, B5 and B10 give better performance compared higher blends, it cannot be recommended as it poses problems of higher levels of exhaust emission.

Keywords: VCR Engine, CR, HC Emissions, CO Emission, CO2 Emission, NOx Emission.

DOI: https://doi.org/10.15623/ijret.2014.0305164