非定常乱流計測におけるデータ解析 : エンジンシリンダ内乱流データ解析法の予備的研究

概要

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The turbulence has a significant effect on the combustion process in an internal combustion engine. It is very important to separate the gas flow in the engine cylinder to the turbulence and the mean flow. The turbulence is defined as higher-frequency components in the turbulent flow. In this study, some methods of frequency filtering for distinguishing the turbulence components in the flow were investigated. The characteristics of four kinds of frequency filtering methods, that is to say, both digital and analog filters of Butterworth types, running-averaged and stationary time-averaged methods, were compared. These methods were applied to an unsteady jet similar to the flow in the engine cylinder, and the turbulence characteristics obtained were discussed.
一般社団法人日本機械学会の論文
1992-01-25