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Investigating the Effect of Compression Ratio on Operating Characteristics of Compression Ignition Engine Fueled with Diesel—Ricebran Biodiesel—n-Butanol Additive Blends

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Abstract

The rapid growth in industrialization, environmental pollution, and diminution of fossil fuels are the significant aspects that encourage researchers to seek alternative renewable fuels. The study aimed to examine the influence of the compression ratio on compression-ignition engine tested with rice-bran biodiesel and n-butanol additive. An investigation has been carried out for various compression ratios under the full load condition for fixed injection timing 30° before the top dead center. The experimental result indicates that the engine torque increases with the compression ratio for all biodiesel blends. The brake-thermal efficiency shows an increasing trend with compression ratio and blends proportion up to the B30n5 blend and a decline for the B40n5 blend. The average decrease in brake-specific fuel consumption was 14% as the compression ratio increased from 16:1 to 19:1, and brake-specific fuel consumption shows an increasing trend with blending proportion. Hydrocarbon and carbon monoxide emissions were reduced by 40% and 15%, respectively. In contrast, carbon dioxide and nitrogen oxide emissions were increased by 10% and 15%, respectively, with an increase in compression ratio from 16:1 to 19:1. High compression ratio results in high heat release and cylinder pressure. The results reveal that the rice-bran biodiesel with n-butanol additives provides comparable performance with diesel and can be used for a diesel engine without modification.

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Abbreviations

B5n5:

Diesel 90% + Rice-bran biodiesel 5% + n-butanol 5% by volume

B10n5:

Diesel 85% + Rice-bran biodiesel 10% + n-butanol 5% by volume

B15n5:

Diesel 80% + Rice-bran biodiesel 15% + n-butanol 5% by volume

B20n5:

Diesel 75% + Rice-bran biodiesel 20% + n-butanol 5% by volume

B25n5:

Diesel 70% + Rice-bran biodiesel 25% + n-butanol 5% by volume

B30n5:

Diesel 65% + Rice-bran biodiesel 30% + n-butanol 5% by volume

B40n5:

Diesel 55% + Rice-bran biodiesel 40% + n-butanol 5% by volume

B10:

Diesel 90% + Biodiesel 10%

B20:

Diesel 80% + Biodiesel 20%

B40:

Diesel 60% + Biodiesel 40%

VCR:

Variable compression ratio

CR:

Compression ratio

CI:

Compression-Ignition

IC:

Internal combustion

\({m}_{\mathrm{f}}^{.}\) :

Fuel flow rate (kg/h)

CV:

Calorific value (kJ/kg)

Q :

Integrated heat release

P :

Indicated pressure in the cylinder (N/m2)

BHP:

Brake power (kW)

IHP:

Indicated power (kW)

BSFC:

Brake-specific fuel consumption

BMEP:

Brake-mean effective pressure

BTE:

Brake thermal efficiency

EGT:

Exhaust gas temperature

T :

Torque (Nm)

N :

Speed (RPM)

L :

Stroke length of the engine (m)

A :

Piston area (m2)

V :

Volume

θ :

Crank angle

p :

In-cylinder pressure

γ :

Specific heat ratio

HC:

Hydrocarbon

CO:

Carbon monoxide

CO2 :

Carbon dioxide

NOx :

Nitrogen oxide

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Authors and Affiliations

  1. Department of Mechanical Engineering, K. E. Society’s Rajarambapu Institute of Technology, Shivaji University, Kolhapur, Uran Islampur, Maharashtra, 415414, India

    Rajendra Pawar & Sharad Patil

  2. Department of Mechanical Engineering, Vishwakarma Institute of Technology, Pune, India

    Dattatray Hulwan

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Pawar, R., Patil, S. & Hulwan, D. Investigating the Effect of Compression Ratio on Operating Characteristics of Compression Ignition Engine Fueled with Diesel—Ricebran Biodiesel—n-Butanol Additive Blends. J. Inst. Eng. India Ser. E 104, 129–140 (2023). https://doi.org/10.1007/s40034-022-00264-2

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