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Thermodynamic model for prediction of performance and emission characteristics of SI engine fuelled by gasoline and natural gas with experimental verification

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Abstract

In this study, a thermodynamic cycle simulation of a conventional four-stroke SI engine has been carried out to predict the engine performance and emissions. The first law of thermodynamics has been applied to determine in-cylinder temperature and pressure as a function of crank angle. The Newton-Raphson method was used for the numerical solution of the equations. The non-differential form of equations resulted in the simplicity and ease of the solution to predict the engine performance. Two-zone model for the combustion process simulation has been used and the mass burning rate was predicted by simulating spherical propagation of the flame front. Also, temperature dependence of specific heat capacity has been considered. The performance characteristics including power, indicated specific fuel consumption, and emissions concentration of SI engine using gasoline and CNG fuels have been determined by the model. The results of the present work have been evaluated using corresponding available experimental data of an existing SI engine running on both gasoline and CNG. It has been found that the simulated results show reasonable agreement with the experimental data. Finally, parametric studies have been carried out to evaluate the effects of equivalence ratio, compression ratio and spark timing on the engine performance characteristics in order to show the capability of the model to predict of engine operation.

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Author information

Authors and Affiliations

  1. Graduate School of the Environment and Energy, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Dashti Mehrnoosh

  2. Department of Chemical Engineering, University of Tehran, Tehran, Iran

    Hamidi Ali Asghar

  3. Department of Mechanical Engineering, Sharif University of Technology, Sharif, Iran

    Mozafari Ali Asghar

Authors
  1. Dashti Mehrnoosh
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  2. Hamidi Ali Asghar
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  3. Mozafari Ali Asghar
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Corresponding author

Correspondence to Dashti Mehrnoosh.

Additional information

Recommended by Associate Editor Kyoung Dong Min

Mehrnoosh Dashti (Ph.D in Energy Engineering, Iran) worked at the energy saving sector of the National Iranian Industry Company (NIOC) as a research assistant between 2003 and 2005. She has served as lecturer at the department of Environment and Energy of SRBIAU and at the department of Mechanical Engineering of CTBIAU from 2005. She has done her Ph.D thesis on the thermodynamic simulation of internal combustion engines fuelled by CNG/gasoline blend. Her research interests are internal combustion engines, fuels and alternative energies and energy saving technologies, especially the modeling and simulation of ICE.

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Mehrnoosh, D., Asghar, H.A. & Asghar, M.A. Thermodynamic model for prediction of performance and emission characteristics of SI engine fuelled by gasoline and natural gas with experimental verification. J Mech Sci Technol 26, 2213–2225 (2012). https://doi.org/10.1007/s12206-012-0303-0

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  • DOI: https://doi.org/10.1007/s12206-012-0303-0

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