Laws of velocity distribution in trapezoidal open channels

被引：1
|
作者：
Hu, Yun-Jin [1 ]
Gao, Hui-Cai [2 ]
Geng, Luo-Sang [3 ]
Cai, Fu-Kuan [4 ]
机构：
[1] Department of Hydraulic and Ocean Engineering, Zhejiang University
[2] Zhejiang Institute of Hydraulic and Estuary
[3] Management Center of Hydraulic Information of Zhejiang Province
[4] Third Harbor Engineering Investigation and Design Institute, China Transportation Engineering
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2009年 / 43卷 / 06期
关键词：
Flux measurement; Hydraulics; Trapezoidal open channel; Velocity distribution;
D O I：
10.3785/j.issn.1008-973X.2009.06.023
中图分类号：
学科分类号：
摘要：
In order to study the velocity distribution in trapezoidal open channels, a 3-D turbulent numerical model, which had been verified by measured results, was used to numerically simulate the flow in 12 different kinds of trapezoidal open channels combined by different base slopes, different wall roughnesses and different aspect ratios. Results showed that the vertical distribution of flow velocity in the bottom inner region of open channel conforms to logarithmic distribution, but that in the outer region conforms to power function distribution, while the transverse distribution of equivalent mean velocity in vertical conforms to power function distribution. Through the least square fitting, laws of vertical distribution of velocity and transverse distribution of equivalent mean velocity in vertical were obtained. The velocity values calculated by the laws of velocity distribution agreed well with the measured values. Therefore, the laws of velocity distribution presented herein provide herein are reasonable and can be applied to the accurate measurement of flux of trapezoidal open channels.
引用
收藏
页码：1102 / 1106
页数：4
相关论文
共 10 条
  • [1] Stearns F.P., A reason why the maximum velocity of water flow in open channels is below the surface, Transactions ASCE, 7, 4, pp. 331-338, (1883)
  • [2] Vanoni V.A., Velocity distribution in open channels, Civil Engineering, 11, 6, pp. 356-367, (1941)
  • [3] Coles D., Law of the wake in the turbulent boundary layer, Journal of Fluid Mechanics, 1, 2, pp. 191-226, (1956)
  • [4] Hu C.-H., Ni J.-R., Study on the law of turbulent velocity profile in rectangular open channels, Hydro-Science and Engineering, 2, pp. 27-35, (1988)
  • [5] Sun D.-P., Wang E.-P., Don Z.-H., Et al., Discussion and application of velocity profile in rectangular open channel, Journal of Hydrodynamics, 19, 2, pp. 144-151, (2004)
  • [6] Yang S.Q., Interaction of boundary shear stress, secondary currents and velocity, Fluid Dynamics Research, 36, 3, pp. 121-136, (2005)
  • [7] Zhang C.-G., Velocity distribution of steady flow in trapezoidal open channels, Journal of Hohai University, 26, 5, pp. 17-21, (1998)
  • [8] Zhang L.-D., Computing discharge in open channel by analytic method of flow field, Hydro-Science and Engineering, 3, pp. 277-282, (1996)
  • [9] Chen Y.-C., Zhu D.-J., Study on longitudinal dispersion coefficient in trapezoidal open channel, Advances in Water Science, 16, 4, pp. 511-517, (2005)
  • [10] Cai F.-K., Study on some key techniques of open channel flow measurement, (2006)
1