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Influence of Exhaust Gas Recirculation on Combustion and Emission Characteristics of Diesel Engine Fuelled with 100% Waste Cooking Oil Methyl Ester

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Abstract

The present research work deals with the application of 30% exhaust gas recirculation (EGR) in a direct injection compression ignition engine fuelled with 100% waste cooking oil methyl ester and conventional diesel. In the first phase of this research work, the performance, emission and combustion characteristics of diesel engine are investigated with the supply of fresh air–fuel mixture for conventional diesel and waste cooking oil methyl ester as fuels and in the second phase the fresh air–fuel mixture is blended with 30% exhaust gas. The study reveals that the 30% EGR addition decreased the brake thermal efficiency by 8 and 18% for conventional diesel and 100% waste cooking oil methyl ester as fuels. Nitrogen oxides emission is reduced to a great extent by 47.5% for diesel fuel and 58.9% for biodiesel fuel at full load condition. Further, the 30% EGR has substantially increased the carbon monoxide and unburnt hydrocarbon emissions for both the fuels at maximum brake mean effective pressure. In addition similar pattern of in-cylinder gas pressure, heat release rate, cumulative heat rate have been observed for fresh air fuel mixture and 30% EGR under various loading conditions.

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Abbreviations

bTDC:

Before top dead center

BSFC:

Brake specific fuel consumption

BSEC:

Brake specific energy consumption

BMEP:

Brake mean effective pressure

BTE:

Brake thermal efficiency

DI:

Direct injection

FFA:

Free fatty acid

EGR:

Exhaust gas recirculation

CO:

Carbon monoxide

CO2 :

Carbon dioxide

NOx :

Oxides of nitrogen

UBHC:

Unburned hydrocarbon

WCME:

Waste cooking oil methyl ester

WCO:

Waste cooking oil

WCME100:

100% Waste cooking oil methyl ester

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Nanthagopal, K., Raj, R.T.K., Ashok, B. et al. Influence of Exhaust Gas Recirculation on Combustion and Emission Characteristics of Diesel Engine Fuelled with 100% Waste Cooking Oil Methyl Ester. Waste Biomass Valor 10, 2001–2014 (2019). https://doi.org/10.1007/s12649-018-0194-0

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