Journal of Thermal Analysis and Calorimetry

, Volume 138, Issue 2, pp 1329–1343 | Cite as

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

  • S. MurugapoopathiEmail author
  • D. Vasudevan


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.


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



Variable compression ratio


Methyl esters of rubber seed oil


Injection pressure (bar)


Compression ratio


Brake thermal efficiency (%)


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


Rubber seed oil


Ignition delay (ºCA)




Naturally aspirated


Heat release rate (J °CA−1)


Indicated mean effective pressure (bar)


Exhaust gas temperature (°C)


Crank angle


Carbon monoxide (%)


Carbon dioxide (%)


Hydrocarbon (ppm)


Oxides of nitrogen (ppm)


Indian standards


Response surface methodology


Analysis of variance


American society of testing and materials


Before top dead center


Free fatty acid

p test

Probability test

F test

Fisher’s test


20% biodiesel + 80% diesel


40% biodiesel + 60% diesel


60% biodiesel + 40% diesel


80% biodiesel + 20% diesel


100% biodiesel

List of symbols


Combustion pressure (bar)


Coefficient of determination




Test statistics


Standard deviation




Crank angle


Gauge pressure



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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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringPSNA College of Engineering and TechnologyDindigulIndia

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