エンジン筒内流の三次元シミュレーション : 噴霧リセスの筒内流に及ぼす影響

概要

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We have developed a three-dimensional program to simulate in-cylinder flow and have attempted to investigate the effect of the recess in the bowl-in-piston chamber. The algorithm is based on the control volume method. All variables are defined at the center of an arbitrarily shaped hexahedron. The κ-ε turbulence model and the law-of-the-wall boundary conditions are used. The calculations are executed with two kinds of computational grids, one with the recess and the other without the recess. It is shown that the effect of the recess appears most clearly in the shape of the vortex formed in the cavity by the swirl-squish interaction in the compression stroke. In the expansion stroke, the effect of the recess is rather small.
一般社団法人日本機械学会の論文
1990-10-25