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Performance, combustion and emission characteristics on VCR multi-fuel engine running on methyl esters of rubber seed oil

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Abstract

This research work is proposed to test and evaluate the performance, combustion and emission characteristics of variable compression ratio engine fueled with methyl esters of rubber seed oil as biodiesel. Experiments are carried out on variable compression ratio engine by considering the compression ratio, load, fuel blends, injection pressure and supercharging pressure as variables. The response surface method prediction models for indicated mean effective pressure, brake thermal efficiency, specific fuel consumption, exhaust gas temperature, maximum combustion pressure, heat release rate, ignition delay, carbon monoxide, hydrocarbon and nitrogen oxides emission are developed using the experimental results. D-optimality test is carried out to get optimum engine-operating conditions with improved performance and emission. Test is conducted via the fuel blends of 20, 40, 60 and 80% biodiesel with neat diesel, with an injection pressure of 160 bar at a fixed compression ratio of 20 and at different supercharging conditions at 80% load. The results of the experiment are compared with that of diesel, which confirms that significant improvements in performance and emission characteristics are obtained with the help of supercharging. The combustion characteristics of biodiesel blends comprehend with that of standard diesel.

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Abbreviations

VCR:

Variable compression ratio

MRSO:

Methyl esters of rubber seed oil

IP:

Injection pressure (bar)

CR:

Compression ratio

BTE:

Brake thermal efficiency (%)

BSFC:

Brake specific fuel consumption (kg kW−1 h−1)

RSO:

Rubber seed oil

ID:

Ignition delay (ºCA)

SC:

Supercharging

NA:

Naturally aspirated

HRR:

Heat release rate (J °CA−1)

IMEP:

Indicated mean effective pressure (bar)

EGT:

Exhaust gas temperature (°C)

CA:

Crank angle

CO:

Carbon monoxide (%)

CO2 :

Carbon dioxide (%)

HC:

Hydrocarbon (ppm)

NOx :

Oxides of nitrogen (ppm)

IS:

Indian standards

RSM:

Response surface methodology

ANOVA:

Analysis of variance

ASTM:

American society of testing and materials

bTDC:

Before top dead center

FFA:

Free fatty acid

p test:

Probability test

F test:

Fisher’s test

B20:

20% biodiesel + 80% diesel

B40:

40% biodiesel + 60% diesel

B60:

60% biodiesel + 40% diesel

B80:

80% biodiesel + 20% diesel

B100:

100% biodiesel

P max :

Combustion pressure (bar)

R 2 :

Coefficient of determination

adj:

Adjusted

X :

Test statistics

σ :

Standard deviation

μ :

Mean

θ :

Crank angle

g :

Gauge pressure

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Acknowledgements

The authors are thankful to the All India Council for Technical Education (AICTE), Government of India, for providing grant (No. 8024/RID/BOR/MOD/70/08/09) under Modernization and Removal of Obsolescence (MODROB) Scheme and the Management of PSNA college of Engineering and Technology for providing matching grant for the purchase of variable compression ratio multi-fuel engine test rig. The research work has been carried out in this test rig.

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Correspondence to S. Murugapoopathi.

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Murugapoopathi, S., Vasudevan, D. Performance, combustion and emission characteristics on VCR multi-fuel engine running on methyl esters of rubber seed oil. J Therm Anal Calorim 138, 1329–1343 (2019) doi:10.1007/s10973-019-08281-x

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Keywords

  • Methyl esters of rubber seed oil
  • Response surface methodology
  • Nitrogen oxide emission
  • Variable compression ratio engine