农业机械学报2012，Vol.43Issue(11)：92-96,5.DOI:10.6041/j.issn.1000-1298.2012.11.017
U形渠道流速分布特性分析与试验
Analysis and Experiment of Distribution Properties and Its Application of Velocity in U-shaped Open Channel
摘要
Abstract
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.关键词
灌区/U形渠道/流速分布/双幂律/中线"三点法"Key words
Irrigation district/ U-shaped channel/ Velocity distribution/ Two-power law/ Midline three point method分类
农业科技引用本文复制引用
杨士红,韩金旭,彭世彰,韩栋..U形渠道流速分布特性分析与试验[J].农业机械学报,2012,43(11):92-96,5.基金项目
"十二五"国家科技支撑计划资助项目(2011BAD25B07)和中央级公益性科研院所基本科研业务费专项资金项目(HKY-JBYW-2012-15) （2011BAD25B07）
