Abstract
Swirl ratio and volumetric efficiency of each cylinder in a production 6-cylinder diesel engine have been estimated under operating conditions using the numerical method, in which the three-dimensional simulation of intake port flow is combined with the one-dimensional simulation of the gas exchange process. The calculated results reveal that the pattern of mass flow rate as a function of crank angle is one of the factors which affect swirl ratios. In multicylinder engines, uneven swirl ratio at each cylinder may be induced owing to the difference in dynamic variation of the induction flow between cylinders, although the configuration of each intake port is the same. The calculated results suggest that there is the possibility of generating variation of the swirl ratio with engine speed and a difference in the swirl ratio between cylinders in such an actual engine where the pipe elements of the intake manifold have different lengths for each cylinder.
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