Scale Effects in Pump Sump Models
Scale Effects in Pump Sump Models
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DOI：
10.1061/(asce)0733-9429(1984)110:11(1540
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发表时间：
1984-11
影响因子：
2.4
通讯作者：
M. Padmanabhan;G. Hecker
中科院分区：
文献类型：
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作者：
M. Padmanabhan;G. Hecker
实验使用一个全尺寸和两个缩小比例的泵水池模型，以1:2和1:4的几何比例进行，以确定比例效应是否扭曲了如此大比例比例的泵水池水力模型的预测能力。利用实验结果研究了可能对涡旋、管道涡流、进口损失和空气吸入造成的尺度效应。在测试范围内，自由表面涡没有明显的尺度效应。管道流旋流和进口损失表现出一定的尺度效应。所遇到的空气核心涡通常较弱，取气量很低。在空气抽吸率测量的准确性范围内，该模型没有显示出对空气抽吸的任何严重低估。
Experiments were conducted using one full‐sized and two reducedscale models of a pump sump to geometric scales of 1:2 and 1:4 to determine whether scale effects distort the predictive ability of hydraulic models of pump sumps with such large scale ratios. Possible scale effects on vortexing, pipe swirl, inlet losses, and air ingestion due to air‐drawing vortices have been examined using the experimental results. No significant scale effects on free‐surface vortexing were evident in the tested ranges. Pipe flow swirl and inlet losses were seen to exhibit some scale effects. The air‐core vortices encountered were generally weak with very low air withdrawals. Within the accuracy of measurements of air‐withdrawal rates, the model did not indicate any gross underprediction of air withdrawals.