水力发电学报
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水力发电学报 ›› 2015, Vol. 34 ›› Issue (11): 88-94.doi: 10.11660/slfdxb.20151110

• 水力发电 • 上一篇    下一篇

矩形明渠水跃段沿程和局部水头损失的计算

  

  • 出版日期:2015-11-25 发布日期:2015-11-25

Calculation of frictional and minor head losses for hydraulic jump section in rectangular open channels

  • Online:2015-11-25 Published:2015-11-25

Abstract: A calculation method of frictional head loss in a hydraulic jump section has been developed using turbulent boundary layer theory based on the previous studies of velocity distribution, wall shear stress, and total head loss. Minor head loss is calculated according to the relationship of total loss versus frictional loss, and local resistance coefficient is estimated using the definition of minor loss. Results show that the frictional loss is a function of the velocity distribution on the initial cross section, the length of hydraulic jump, and the kinematic viscosity of water while the minor loss and resistance coefficient a function of conjugate depth ratio and the Froude number at the initial cross section. The analysis includes relationships of the total head ratio of hydraulic jump section over jump area, relative frictional loss, relative minor loss, and local resistance coefficient versus the Froude number. It shows that among these four parameters, the relative frictional loss decreases with the Froude number while the other three increase with it.

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