| 丁坝回流长度 |
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| 引用本文： | 乐培九,李旺生.丁坝回流长度[J].水道港口,1999(2):3-9. |
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| 作者姓名： | 乐培九 李旺生 |
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| 摘 要： | 丁坝下游水流断面突然放大,水流分离,形成狭长的回流区,根据水流分离区局部水头损失的包达(Borda)公式,并仿沿程水头损失的达西(Darcy)公式,可获得非淹没丁坝回流长度的计算公式,用矩形水槽和抛物线形河底的水槽试验资料检验,结果良好
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| 关 键 词： | 丁坝 回流 水头损失 压缩比 |
Length of Whirlpool Flow Behind Dikes |
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| Abstract: | When stream cross section is suddenly increased behind the dike, the flow is separated at the dike head,and then a whirlpool region is fanned. Based on Borda's formula for local water head loss of flow epatating region and Darcy' s formula for local water head loss along the stream line, the calculated formula of the length of the whirlpool region behing die unsubrnerged dike is obtained.The calculated results are in good agreement with die experimented data of the rectangular flume and the parabola riverbed flume. |
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| Keywords: | dike whirlpool flow water head loss ratio of compression |
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