Effect of Bio Ethanol and Diesel Blend on Small Diesel Engine Vibration

The use of Bio-ethanol as an alternative diesel engine fuel is rapidly increasing. Bio-ethanol is mixed with diesel fuel at different ratios and used in CI and SI engines. Since vibrations have direct effects on users and engine components، for this reason analysis of vibration resulting from combustion in CI engines is very important. In this study، evaluation of vibration was performed for both diesel and ethanol blends. Commercial diesel fuel (D100)، E2 (2% ethanol and 98% diesel fuel)، E5، E10، E15 and E20 were used in a two-wheel MITSUBISHI tractor. The engine was tested in 1200، 1600، 2000 and 2400 rpm for all fuel blends، and also the effect of load was investigated for D100 and E10. Results showed that vibration is significantly affected by fuel blend. It was observed that E10 had the lowest vibration while E20 had the highest value. It was also observed that vibration increased as engine speed increased for all fuel blends. It was found that both axial and lateral vibrations affected significantly by load. The lateral vibrations decreased continuously with load rise، but the axial vibrations increased initially but started to follow a reverse trend.