気流を伴う消音器に関する研究 : 第3報,消音器内部流れの速度変動と気流音との相関

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This paper describes an experimental study on the relationship between fluctuating velocity in a muffler and flow induced noise for an expansion cavity type muffler and a perforated straight-through pipe type muffler. The visualization of internal flow and the measurement of fluctuating velocity in a muffler were performed using the smoke-wire method and hot-wire velocimeter. From these experiments. the flow pattern and the distribution of fluctuating velocity were able to be clearly shown for each type of muffler. The correlation between fluctuating velocity on each point in a muffler and flow induced noise radiated from the open end was also studied by calculating the coherence function between them. It was seen that the flow induced noise was closely correlated with fluctuating velocity of internal flow especially in the ranges of tail pipe and/or cavity resonance frequencies.
社団法人日本機械学会の論文
1987-02-25