明流泄洪洞弯道水流特性试验研究
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摘要
某水库泄洪洞弯道水流流态极差。针对此问题,在弯道段加设5道斜导流坎,很好地解决了水流流态差的问题,但在斜导流坎的右边侧壁、导流坎后面的底板及导流坎的顶部出现负压,且负压值很大。工程最终采用限制泄洪洞下泄最大流量,由原来的346.74 m3/s减小到266.68 m3/s,即闸门由原来的3.2 m全开下压至2.8 m局开,水流流态得到了改善。
As the flow regime of the spillway tunnel curve of a certain reservoir is very bad,5 rectangle oblique ridges are arranged on the curve section,and the flow regime is thus improved. Negative pressure,however,occurs to the sidewall of the oblique ridge and the floor behind the oblique ridge and the top of the oblique ridge,and this negative pressure is rather big. Eventually the designer of the project decided to limit the maximum discharged volume of the spillway tunnel,reducing the volume from 346.74 m3/s to 266.68 m3/s,namely reducing the door from 3.2 m to 2.8 m degree,the results show that this solution can mitigate the problem of the flow regime caused by turning open flow.
As the flow regime of the spillway tunnel curve of a certain reservoir is very bad,5 rectangle oblique ridges are arranged on the curve section,and the flow regime is thus improved. Negative pressure,however,occurs to the sidewall of the oblique ridge and the floor behind the oblique ridge and the top of the oblique ridge,and this negative pressure is rather big. Eventually the designer of the project decided to limit the maximum discharged volume of the spillway tunnel,reducing the volume from 346.74 m3/s to 266.68 m3/s,namely reducing the door from 3.2 m to 2.8 m degree,the results show that this solution can mitigate the problem of the flow regime caused by turning open flow.
引文
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[2]刘小江,邓军,张叶林,等.高速明流转弯水力学问题解决方案[J].西南交通大学学报,2012(5):.LIU Xiaojiang,DENG Jun,ZHANG Yelin,et al.Discussion of the solution on the hydraulic problem of turning and high-speed open flow[J].Journal of Southwest Jiaotong University,2012(5):(in Chinese).
[2]刘小江,邓军,张叶林,等.高速明流转弯水力学问题解决方案[J].西南交通大学学报,2012(5):.LIU Xiaojiang,DENG Jun,ZHANG Yelin,et al.Discussion of the solution on the hydraulic problem of turning and high-speed open flow[J].Journal of Southwest Jiaotong University,2012(5):(in Chinese).