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Experimental investigation on a diesel engine using neem oil and its methyl ester

Author(s): Sivalakshmi S. | Balusamyb T.

Journal: Thermal Science
ISSN 0354-9836

Volume: 15;
Issue: 4;
Start page: 1193;
Date: 2011;
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Keywords: Neem oil | Neem Oil Methyl Ester | Combustion | Performance | Diesel Engine

Fuel crisis and environmental concerns have led to look for alternative fuels of bio-origin sources such as vegetable oils, which can be produced from forests, vegetable oil crops and oil bearing biomass materials. Vegetable oils have energy content comparable to diesel fuel. The effect of neem oil (NeO) and its methyl ester (NOME) on a direct injected four stroke, single cylinder diesel engine combustion, performance and emission is investigated in this paper. The results show that at full load, peak cylinder pressure is higher for NOME; peak heat release rate during the premixed combustion phase is lower for neat NeO and NOME. Ignition delay is lower for neat NeO and NOME when compared with diesel at full load. The brake thermal efficiency is slightly lower for NeO at all engine loads, but in the case of NOME slightly higher at full load. It has been observed that there is a reduction in NOx emission for neem oil and its methyl ester along with an increase in CO, HC and smoke emissions.

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