急拡大部下流における管内流れの振動現象に関する研究

概要

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The purpose of this study is to clarify the mechanism of oscillatory flow in a duct downstream of an abrupt enlargement, where the flow velocity is almost sonic. The flow pattern has, so far, been analyzed experimentally and theoretically when the flow is steady. The oscillatory flow has also been studied qualitatively. In the present paper, the time-mean static pressures were measured along the duct wall and shadowgraph pictures of the flow pattern in the duct were taken for the varying pressure ratios across the duct. These results, together with those by analysis using a one-dimensional flow model, brought about four different flow patterns. A high-speed Mach-Zehender interferometer was used to obtain the change in density distribution with time when the base pressure oscillation was taking place, and the mechanism of this self-excited oscillation was discussed.
一般社団法人日本機械学会の論文
1991-06-25