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An experimental investigation on the performance, combustion and emission characteristics of a variable compression ratio diesel engine using diesel and palm stearin methyl ester

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Abstract

An attempt has been made to use biodiesel prepared from non-edible portion of palm oil as fuel of a conventional mono-cylinder compression ignition engine. The present experimental investigation takes into account the combined effect of using blends of diesel–palm stearin biodiesel as fuels and the compression ratio on different performance, combustion and emission characteristics of the said engine. The experiments have been carried out on a single-cylinder, direct injection diesel engine at varying compression ratio of 16:1–18:1 in four steps. It is observed that the brake thermal efficiency reduces by 7.9% when neat biodiesel is used instead of diesel. But, it increases with the increase in compression ratio for all the blends. Brake specific fuel consumption and exhaust gas temperature increase with the addition of biodiesel to diesel and also with the increase in compression ratio. Heat release rate decreases with biodiesel, and it is minimum at the rated compression ratio of 17.5:1 for all the fuels considered here. On the other hand, ignition delay is found to be more with neat diesel, and it increases with the decrease in compression ratio. Significant reductions in emissions of carbon monoxide (CO), hydrocarbon (HC) and smoke are observed with biodiesel, while the emissions of oxides of nitrogen (NOx) and carbon dioxide (CO2) increase. The decrease in compression ratio increases the emissions of CO, HC and smoke, but the emissions of NOx and CO2 decrease with the decrease in compression ratio.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, West Bengal, 711103, India

    Ambarish Datta & Bijan Kumar Mandal

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  1. Ambarish Datta
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  2. Bijan Kumar Mandal
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Correspondence to Bijan Kumar Mandal.

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Datta, A., Mandal, B.K. An experimental investigation on the performance, combustion and emission characteristics of a variable compression ratio diesel engine using diesel and palm stearin methyl ester. Clean Techn Environ Policy 19, 1297–1312 (2017). https://doi.org/10.1007/s10098-016-1328-3

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  • DOI: https://doi.org/10.1007/s10098-016-1328-3

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