簡易モデルによるシリンダ内スワールの予測計算 : 第1報, 計算モデル

概要

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Many simulation studies on in-cylinder flow are mainly classified into three-dimensional models such as the k-ε model for Navier-Stokes equations. But one hour or more of calculating time by a supercomputer is wasted to complete one process of the engine cycle. Therefore it has been also necessary to predict the mean swirl velocity in a short time even if it has a slight defect in accuracy. In this paper, the mean velocity of in-cylinder flow was predicted by the model where the angular momentum of the in-cylinder gas depended on the induced momentum from the new charge and the friction moment from the cylinder walls or the element boundaries. The induced momentum was calculated from the energy equations of the gas in the engine, and the friction moment was estimated by the viscous torque. The trends of the predicted results were in agreement with the experimental data obtained by the other researcher, and the validity of this model was examined. The merit of this model is its ability to predict under the condition of changing engine revolution or amount of new charge, and also it requires only a short calculation time.
社団法人日本機械学会の論文
1991-08-25