Flow choking over weir flow slit-type flip buckets

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• 作者：Fei MA ((马飞)) ^{mafei921@163.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Zhun XU ((徐准)) ; Jian-hua WU ((吴建华)) ; ^{jhwu@hhu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：flow choking ; jet trajectory ; dynamic pressure ; slit-type flip bucket ; weir flow
• 刊名：Journal of Hydrodynamics, Ser. B
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：27
• 期：6
• 页码：907-912
• 全文大小：1397 K

文摘

The flow choking may occur for weir flow slit-type flip buckets under common operation conditions. An estimation method is developed through introducing a comprehensive coefficient to determine the approach flow Froude number for the flow choking to occur in those flip buckets. The error of the present method relative to the experimental data is less than 5%. The results show that, the Froude number for the flow choking to occur is related to the contraction ratio and the contraction angle of the flip buckets. When the flow choking occurs, the upper jet trajectory decreases and the lower one is almost not affected, and the dynamic pressures on the bottom and the sidewalls increase due to the flow profile rising on the flip buckets.