Behavior of free surface vortices in cylindrical vessel under fluctuating flow rate

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文字 秀明*; 秋本 敏憲*; 三輪 大祐*; 上出 英樹 

Monji, Hideaki*; Akimoto, Toshinori*; Miwa, Daisuke*; Kamide, Hideki

本研究では、円筒容器内に形成したガス巻込み渦の速度場を計測し、ガスコア長に及ぼす流れ場の影響を調べた。その結果、比較的短い周期の流量変動では容器内の循環はほとんど変わらないことがわかり、流量変動時にガスコア長が変動するのは下降流速変動のためと推定された。

In this study, the unsteady flow structure of the free surface vortex was investigated under periodical flow fluctuating conditions in a cylindrical vessel. The gas core length of the free surface vortex and the velocity field in the vessel were measured by image processing. The experimental results showed that the gas core length under the fluctuating flow condition was shorter than that in the steady state having the same flow rate as the maximum rate of the fluctuating flow when the period of the flow fluctuation was short.