シリンダ内流れの数値解析

概要

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A numerical method of the analysis for three-dimensional turbulent flows in cylinders of reciprocating engines with arbitrary geometry is described. A scheme of the finite volume-finite element methods is used, employing a large number of small elements of arbitrary shapes to form the cylinder. The fluid dynamic equations are expressed in integral form for each element, taking into account the deformation of the element shape according to the piston movements, and are solved in the physical space using rectangular coordinates. The conventional k-ε two-equation model is employed to describe the flow turbulence. Example calculations are presented for the simple pancake-type combustion chambers having an annular intake port at either centre or asymmetric position of the cylinder head. The suction inflow direction is also changed in a couple of ways. The results show a good simulation of overall fluid movements within the engine cylinder.
一般社団法人日本機械学会の論文
1985-11-25