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Energy, economy and pollution factor of internal combustion engine profoundly influence the development of the society. It is well known that efficiency of an internal combustion engine increases by compression ratio, and is limited due to knocking and high thermal stress development in the combustion chamber of an engine. On another side, an efficiency of internal combustion engine decreases toward the more top engine speed. Considering this, a concept is proposed which can change its compression ratio with speed. Variation in compression ratio is achieved by a change in stroke length through moving crank pin within the crank. In this paper the mechanism of operation and prediction of performance characteristics of variable compression ratio spark ignition engine with varying speed using quasi-dimensional combustion simulation mode is presented. It was observed that proposed mechanism provides better fuel efficiency at higher engine speed. Further, it is inferred that 3 mm increase in crank length results in 7% increment in thermal efficiency and 8% decrement in brake specific fuel consumption for 13 compression ratio at 6000 rpm.
PAPER REVISED: 2017-06-26
PAPER ACCEPTED: 2017-11-27
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  1. Ismet Sezer, Thermodynamic, performance and emission investigation of a diesel engine running on dimethyl ether and diethyl ether, International Journal of Thermal Sciences 50 (2011), pp. 1594-1603.
  2. Rodrigo C. Costa, José R. Sodré, Compression ratio effects on an ethanol/gasoline fuelled engine performance, Applied Thermal Engineering, 31 (2011), pp. 278-283.
  3. John B Heywood, Internal Combustion Engine Funadmental, 1988
  4. Jehad A.A. Yamin, Mohammad H. Dado, Performance simulation of a four-stroke engine with variable stroke-length and compression ratio, Applied Energy, 77 (2004), pp. 447-463.
  5. Avinash Alagumalai, Internal combustion engines: Progress and prospects, Renewable and Sustainable Energy Reviews, 38 (2014), pp. 561-571.
  6. Juan Pablo Gómez Montoya, Andrés A. Amell , Daniel B. Olsen, Prediction and measurement of the critical compression ratio and methane number for blends of biogas with methane, propane and hydrogen, Fuel, 186 (2016), pp. 168-175.
  7. Mustafa Kemal Balki, The effect of compression ratio on the performance, emissions and combustion of an SI (spark ignition) engine fueled with pure ethanol, ethanol and unleaded gasoline, Energy, 71 (2014), pp.194-201
  8. Bayrakar Hakan,Durgun, Development of an empirical correlation for combustion durations in spark ignition engines, Energy Conversion and Management, 45(2004), pp. 1419-1431.
  9. Muralidharan K, Vasudevan D, Performance, emission and combustion characteristics of a variable compression ratio engine using methyl esters of waste cooking oil and diesel blends, Applied Energy, 88 (2011), pp. 3959-68.
  10. Tadveer Singh Hora, Avinash Kumar Agarwal , Effect of Varying Compression Ratio on Combustion, Performance, and Emissions of a Hydrogen Enriched Compressed Natural Gas Fuelled Engine, Journal of Natural Gas Science and Engineering, 31 (2016), pp. 819-828.
  11. Martyn Roberts, Benefits and challenges of variable compression ratio (VCR), SAE 2003 Paper Number 2003-01-0398.
  12. Sundeep Ramachandran, Rapid Thermodynamic Simulation Model of an Internal Combustion Engine on Alternate Fuels, Proceedings of the International MultiConference of Engineers and Computer Scientists, Hong Kong, Vol. 2, 2009, pp.
  13. Al-Baghdadi MARS. A simulation model for a single cylinder four-stroke spark ignition engine fueled with alternative fuels. Turkish J. Eng. Env. Sci., 30 (2006)331-350.
  14. Ashish J.Chaudharia, Niranjan Sahoob,Vinayak Kulkarni, Simulation Models for Spark Ignition Engine: A Comparative Performance Study, Energy Procedia, 54 ( 2014 ), pp. 330 - 341.
  15. A.S. Ramadhas, S. Jayaraj, C. Muraleedharan, Theoretical modeling and experimental studies on biodiesel- fueled engine, Renewable Energy, 31 (2006), pp. 1813-1826.
  16. Liu Shenghua, Eddy R. Cuty Clemente, Hu Tiegang , Wei Yanjv, Study of spark ignition engine fueled with methanol/gasoline fuel blends, Applied Thermal Engineering, 27 (2007), pp. 1904-1910.
  17. Mohsen Mardi K , Shahram Khalilarya , Arash Nemati, A numerical investigation on the influence of EGR in a supercharged SI engine fueled with gasoline and alternative fuels, Energy Conversion and Management, 83 (2014), pp. 260-269.
  18. G. Gonca , B. Sahin , A. Parlak , Y. Ust , V. Ayhan , I. Cesur , Theoretical and experimental investigation of the Miller cycle diesel engine in terms of performance and emission parameters, Appl. Energy, 138 (2015), pp. 11-20 .
  19. Guven Gonca, Performance analysis and optimization of irreversible Dual-Atkinson cycle engine (DACE) with heat transfer effects under maximum power and maximum power density conditions, Applied Mathematical Modelling, 40 (2016), pp. 6725-6736.
  20. Horlock JHFRS, Winterbone DE, Thermodynamics and gas dynamics of Internal Combustion engine. New York: Clarendon Press Oxford, Vol. 1 & 2, 1986.
  21. Mohand Said Lounici et al, Investigation on heat transfer evaluation for a more efficient two-zone combustion model in the case of natural gas SI engines, Applied Thermal Engineering, 31 (2011), pp. 319-328.
  22. P.L.Curto-Risso et al, Optimizing the geometrical parameters of a spark ignition engine: Simulation and theoretical tools, Applied Thermal Engineering, 31 (2011), pp. 803-810.
  23. Ali M. Pourkhesalian, Amir H. Shamekhi, Farhad Salimi, Alternative fuel and gasoline in an SI engine: A comparative study of performance and emissions characteristics, Fuel, 89 (2010), pp. 1056-1063.
  24. Dashti Mehrnoosh, Hamidi Ali Asghar and M.A.Asgar, Thermodynamic model for prediction of performance and emission characteristics of SI engine fuelled by gasoline and natural gas with experimental verification, Journal of Mechanical Science and Technology, 26 (7) (2012), pp. 2213-2225.
  25. Jeewan V Tirkey, H N Gupta, S K Shukla, Integrated gas dynamic and thermodynamic computational modeling of 4 stroke SI engine using gasoline as a fuel, Thermal Science, 13(2009), pp. 113-130.

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