矩形明渠流速分布特征及其在流量量测中的应用  

Distribution Properties of Velocity Flow Auto-measurement Method and in Rectangular Open Channel

作　　者：王二平[1] 金辉[1] 张艳艳[1] 关靖[1] 曹兵[1] 

机构地区：[1]华北水利水电学院,郑州450011

出　　处：《灌溉排水学报》2008年第4期25-28,共4页Journal of Irrigation and Drainage

基　　金：国家"十一五"科技支撑计划项目(2006BAB06B00-04)

摘　　要：通过对明渠流速的水槽试验研究,建立了矩形断面明渠流速沿垂线分布的抛物线公式和流速横向分布的乘幂函数公式,拟合分析给出了流速分布系数的确定方法。实测渠道流速资料验证表明,所提出的明渠流速分布规律与实际分布一致。根据提出的明渠流速分布规律,给出了确定明渠流量的简易测定与计算方法,计算相对误差较小,可以满足明渠流量计量的精度要求。在此基础上设计了实用流量自动化测量系统,可以简化明渠测流工作量,降低测量成本、提高明渠测流精度,已在一些引水渠道中使用。Through the flume experimental research, the author sets up a velocity distribution formula for rectangular open channel, including parabola form of velocity distribution on the vertical and power form of mean velocity distribution on the transverse direction; meanwhile, the means of ascertaining velocity pro- file coefficient were given in this paper. Validation of the observing velocity data in nature channels indicates that the given velocity-distribution law is in accordance with the real velocity-distribution perfectly in the open channel. Base on the law, facility measurement method of discharge was given and the relative er- ror between observing value and calculating value of point velocity is small, which can satisfy the precision requirement in the calculation of velocity distribution and discharge in the open channel. The auto-measurement system which is designed based on the law can simply the measure work, reduces cost and increases the measuring accuracy. The system has used in some lead channel.

关 键 词：流速分布规律 无量纲流速 流速分布系数 明渠流量 自动量测系统 

分 类 号：TV133[水利工程—水力学及河流动力学]