Effect of Calophyllum Inophyllum biodiesel-diesel blends on combustion, performance, exhaust particulate matter and gaseous emissions in a multi-cylinder diesel engine

• Published in: Fuel (Guildford) 2018-09, Vol.227, p.154-164
• Main Authors: How, H.G., Masjuki, H.H., Kalam, M.A., Teoh, Y.H., Chuah, H.G.
• Format: Article
• Language: English
• Subjects: Airborne particulates; Biodiesel; Biodiesel fuels; Biofuels; Brakes; Calophyllum; Carbon monoxide; Combustion; Combustion products; Common-rail; Diesel engine; Diesel engines; Diesel fuels; Engine cylinders; Exhaust emissions; Exhaust gases; Flowers & plants; Fossil fuels; Fuels; Heat release rate; Heat transfer; Inedible; Mixtures; Nitrogen oxides; Particulate emissions; Particulate matter; Particulates; Physicochemical properties; Power consumption; Pressure; Smoke; Superchargers; Thermodynamic efficiency
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2018.04.075

•Torque and brake power reduced while BSFC rises with higher biodiesel blend.•Lower smoke and CO for all biodiesel blends and it decreases with higher biodiesel blend.•NOx emission is higher than diesel for all biodiesel fuel blends and CIB50 releases the highest NOx.•Lower PHRR for all blends of biodiesel and it diminishes with higher blend ratio.•CIB blends emitted lower mass of PM and smaller size granular structure than diesel. In this work, the effects of adding of inedible Calophyllum Inophyllum biodiesel to diesel fuel on performance, gaseous emissions, particulate matter (PM) and combustion characteristics were studied in a medium-duty, high-pressure common-rail turbocharged four-cylinder diesel engine under different speed and torque conditions. The key physicochemical properties of neat biodiesel, biodiesel-diesel blends and diesel were characterized and analysed. The test fuels used were a fossil diesel fuel, B10, B20, B30, and B50 of biodiesel-diesel fuels. The results indicated that all blends of biodiesel fuels have physicochemical properties relatively close to those of petroleum diesel. The experimental results also demonstrated that there are some drawbacks in engine brake power, brake specific fuel consumption (BSFC), and nitrogen oxide (NOx) with the blend of biodiesel in the fuel. Besides, refinement in brake thermal efficiency (BTE) and exhaust emissions were recorded across all engine speeds. Moreover, the emission improvement was characterized by lower carbon monoxide (CO) and reduced in both of the smoke and PM emissions. Also, reduction in the magnitude of peak combustion pressure and heat release rate (HRR) were also found with biodiesel blends. Overall, the results indicated that Calophyllum Inophyllum biodiesel can be used satisfactorily in an unmodified multi-cylinder high-pressure common-rail diesel engine.