四サイクル機関の吸気弁孔流路内流れの予測 : 第4報,弁出口境界取扱方法の改良

概要

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In order to improve the accuracy of the estimation of swirl intensity, the treatment of the valve outlet boundary has been improved. In the improved treatment in this study, the gas flow is calculated by taking into account the configuration of the valve face and the valve seat using the porosity approach, without prescribing the outflow direction. By comparing the calculated results with the experimental results under unsteady conditions, it has been found that this improved treatment enables one to estimate the dynamic effects of the intake pipe on swirl intensity and volumetric efficiency. By using this improved treatment, numerical prediction has been carried out under motoring conditions of a practical engine. The calculated results reveal that the swirl ratio varies considerably with the engine speed and that the variation of the swirl ratio does not correspond to the variation of volumetric efficiency with the engine speed.
一般社団法人日本機械学会の論文
1990-03-25