Analysis and experiment of distribution properties and its application of velocity in U-shaped open channel

作者：Yang Shihong; Han Jinxu; Peng Shizhang^*; Han Dong

来源：Transactions of the Chinese Society for Agricultural Machinery, 2012, 43(11): 92-96.

DOI：10.6041/j.issn.1000-1298.2012.11.017

• Computational accuracy
• Different operating conditions
• Distribution property
• Irrigation districts
• Three-point methods
• Two-power laws
• U-shaped channels
• Vertical velocity distribution

Based on indoor and field experiments, velocity distribution properties of U-shaped open channel were analyzed. Exponent formula for horizontal velocity distribution properties and two-power law for vertical velocity distribution properties were established. The methods to define the parameters were given. Then the midline three-point for flow measurement of open channel was put forward based on the velocity distribution properties of U-shaped channel. The fractional errors of flow velocities calculated by the midline three-point method in indoor experiment under different operating conditions and field experiment were within ±4% and ±5%, respectively. Validations showed that the midline three-point method increased the computational accuracy of flow measurement in open channel. In addition, the workload of the flow measurement by the midline three-point method was substantially reduced by more than 60% compared with velocity-section method which needed nine measuring points.

• 出版日期2012
• 单位河海大学