Optimization of In-Cylinder Flow and Mixing for a Center-Spark Four-Valve Engine Employing the Concept of Barrel-Stratification 940986
Flow and flame structure visualization and modeling were performed to clarify the characteristics of bulk flow, turbulence and mixing in a four-valve engine to adopt the lean combustion concept named “Barrel-Stratification” to the larger displacement center-spark four-valve engine. It was found that the partitions provided in the intake port and the tumble-control piston with a curved-top configuration were effective to enhance the lean combustion of such an engine. By these methods, the fuel distribution in the intake port and the in-cylinder bulk flow structure are optimized, so that the relatively rich mixture zone is arranged around the spark plug. The tumble-control piston also contributes to optimize the flow field structure after the distortion of tumble and to enable stable lean combustion.
Citation: Kuwahara, K., Watanabe, T., Takemura, J., Omori, S. et al., "Optimization of In-Cylinder Flow and Mixing for a Center-Spark Four-Valve Engine Employing the Concept of Barrel-Stratification," SAE Technical Paper 940986, 1994, https://doi.org/10.4271/940986. Download Citation
K. Kuwahara, T. Watanabe, J. Takemura, S. Omori, T. Kume, H. Ando
Mitsubishi Motors Corp.
International Congress & Exposition
SAE 1994 Transactions: Journal of Engines-V103-3