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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

Mehrnoosh, D ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1007/s12206-012-0303-0
  3. Publisher: 2012
  4. Abstract:
  5. 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
  6. Keywords:
  7. CNG ; Combustion pro-cess ; Crank angle ; Engine operations ; Engine performance ; Equivalence ratios ; Experimental data ; Experimental verification ; First law of thermodynamics ; Flame front ; Mass burning rate ; Numerical solution ; Parametric study ; Performance and emissions ; Performance characteristics ; SI Engines ; Simulated results ; Spark timing ; Specific fuel consumption ; Temperature dependence ; Thermodynamic cycle ; Thermodynamic model ; Thermodynamic modeling ; Two-zone model ; Computer simulation ; Engines ; Forecasting ; Gasoline ; Machine design ; Newton-Raphson method ; Specific heat ; Thermodynamics ; Flame research
  8. Source: Journal of Mechanical Science and Technology ; Volume 26, Issue 7 , July , 2012 , Pages 2213-2225 ; 1738494X (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs12206-012-0303-0