The impact of Methanol-Diesel compound on the performance of a Four-Stroke CI engine (original) (raw)

Materials Today: Proceedings, 2021

Abstract

Abstract The impact of blending diesel fuel with different ratios of methanol was investigated in a TD 212 laboratory internal combustion diesel engine which is a single-cylinder, four-strokes, and pneumatic cooling. The tested engine was fuelled by a diesel fuel blending with methanol in a volume percentage of 7, 14 and 21, and the results were compared with pure diesel fuel. To avoid a phase separation issue, 1% of 1-dodecanol was added into each blend. The engine was operated within a constant speed of 2000 rpm under three levels of torques 2, 4 and 6 N.m. The brake-specific fuel consumption (BSFC), engine effective power (Ne), brake-specific energy consumption (BSEC), brake thermal efficiency (BTE), and noise level of the tested engine as well as the exhaust temperature were evaluated. The results showed that blending diesel with methanol up to 14% improves the performance of the fuel through improving BSFC, Ne, BSEC, BTE, noise level, and decrease the exhaust temperature due to increase the oxygen content of the fuel resulted from adding methanol which also lowers the fuel density and viscosity. This lowering in the fuel density and viscosity decrease the noise level and improve the combustion rate of the fuel. Improving the combustion with lowering the exhaust temperature lead to decrease the formation of NOx components which are serious pollutants for the environment. The further increasing of methanol percentage negatively impacts the fuel consumption and engine efficiency due to methanol higher ignition temperature and latent heat of vaporization as well as its lower cetane number comparing with regular diesel fuel, which resulted in faulty ignition quality.

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