シリンダ内三次元流れの数値解析とその実験的検証

概要

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Modeling of turbulence is one of the most important issues in calculating the in-cylinder flow of internal combustion engines. The authors have been engaged in evaluating the applicability of the k-ε turbulence model and also developing modified k-ε models, such as the C_D revised k-ε model which has the ability to reproduce turbulent characteristics in nearly isotropic fields, and another modified k-ε model which shows extensive multiplicity of predicting the mean velocity on any kind of turbulent field. This basic study has been made on axisymmertrical flow frields. In this report, detailed comparisons between the calculation and measurement are made to evaluate these turbulence models in an axisymmetrical field with a bowl-in piston. Also, a newly designed 3-D cylinder head that employs a variable swirl-intensity mechanism with a flat piston configuration is built for the test. Obtained conclusions in the 3-D case are fundamentally the same as those derived from the axisymmetrical cases.
社団法人日本機械学会の論文
1992-08-25