(2-20) Numerical Analyses of the Combustion Process in a Spark-Ignition Engine((SI-6)S. I. Engine Combustion 6-Modeling)

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概要

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• The development and optimization of internal combustion engines requires the application of advanced development tools. In addition to experimental methods, numerical calculations are needed in order to obtain an insight into the complex in-cylinder processes. In this context, the modeling of the combustion phenomena represents an important aspect. Therefore the objective of this paper is to present numerical methods to analyse the combustion process in premixed spark-ignition engines. The investigations were performed in a 6-cylinder 2.8 1 SI-engine running at wide open throttle. The numerical calculations were performed using the finite volume CFD code STAR-CD. The mesh generation process, including the description of the piston and the valve motion, was automated using ICE. Combustion in the present study was treated with the one-equation Weller flamelet model. This model was implemented in Star-CD. The mass fractions of the combustion products were assumed to follow the local and instantaneous thermodynamic equilibrium values. The equilibrium composition of the cylinder charge was calculated according to Olikara/Borman. Eleven species were considered : O_2, CO_2, H_2O, N_2, H, O, N, H_2, OH, CO and NO. Isooctane was used as fuel. For the calculation of the convective heat transfer during the combustion process a further submodel for the calculation of the heat transfer coefficient was used. In this work, different operating conditions were analysed. For all operating conditions the gas exchange process and the combustion process were calculated. Every calculation started 40° CA BTDC and finished when the combustion was completed. The boundary conditions were gained by experimental investigations. For the verification of the combustion model, calculated cylinder pressure data and mass fractions burned are compared to experimental results. The results of the combustion process are discussed for different engine speeds and equivalence ratios. This discussion reveals that the combustion model used shows encouraging results. The comparison of the calculated and measured in-cylinder pressure indicates good agreement for equivalence ratios between 0.87 and 1.25 and engine speeds up to 3000 r/min. The shape of the predicted flame appears to be reasonable.

• 一般社団法人日本機械学会の論文
• 2001-07-01

著者

• Spicher Ulrich

  Institut Fur Kolbenmaschinen Universitat Karlsruhe (th)

• Peters Holger

  Institut Fur Kolbenmaschinen Universitat Karlsruhe (th)

• Worret Ralph

  Institut fur Kolbenmaschinen, Universitat Karlsruhe (TH)

• Worret Ralph

  Institut Fur Kolbenmaschinen Universitat Karlsruhe (th)

• Spicher Ulrich

  Institut Fur Kolbenmaschinen (institute Of Reciprocating Engines) University Of Karlsruhe (th)

関連論文

• A Study of the Ignition and Combustion Process in a Gasoline HCCI Engine Using Port and Direct Fuel Injection(HCCI, Combustion Processes I)
• (2-20) Numerical Analyses of the Combustion Process in a Spark-Ignition Engine((SI-6)S. I. Engine Combustion 6-Modeling)
• MD1-3: Three-Dimensional Visualisation of Auto-Ignition Processes in Spark-Ignition Engines : Practical Examples of Abnormal Combustion and HCCI Auto-Ignition(MD: Measurement and Diagnostics,General Session Papers)
• HC1-1: Numerical Analyses of the Effects of Mixture Quality on the Controlled Autoignition in Gasoline Engines(HC: HCCI Combustion,General Session Papers)

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