Impact of various metal-oxide based nanoparticles and biodiesel blends onthe combustion, performance, emission, vibration and noise characteristicsof a CI engine

Abstract

With the burning of 1 L of diesel fuel, approximately 3 kg of greenhouse gas is released into the atmosphere.Therefore, it is of great importance to reduce emissions with some additives in diesel engines. This study dealswith the impacts of blends of waste cooking oil methyl ester and various metal-oxide based nanoparticles on theemission, combustion, performance, vibration and noise characteristics of a single-cylinder diesel engine. Thetest engine was loaded at different engine loads of 2.5, 5, 7.5 and 10 Nm and a constant engine speed of2000 rpm. In this investigation, various fuels [called as reference diesel (D100), 10 vol% of waste cooking oilmethyl ester (B10), andfinally the mass fractions of 100 ppm aluminium oxide (B10Al2O3), titanium oxide(B10TiO2) and silicon oxide (B10SiO2) into the B10, separately] were tested. The addition of metal-oxide basednanoparticles hasfirstly increased the viscosity, cetane number, and heating value of biodiesel. Higher oxygenatoms in biodiesel-nanoparticles blends have improved the quality of the combustion process. Higher peak pointin CPmaxand HRRmaxcould be reached in these nano fuels due to their lower cetane numbers than that of D100.CO, HC and NOxemissions were significantly reduced with the blending of nanoparticles and biodiesel incomparison with those of D100. The addition of nanoparticles highly improved engine performance. B10 had thelowest thermal efficiency due to its heating value, but its efficiency was converted to the highest one with theaddition of nanoparticle. In conclusion, this study is suggesting that the addition of metal-oxide based nano-particles into biodiesel blends can give better results than using biodiesel alone for diesel engines.