摘要
大型输水明渠流量测量是运行管理的一个重要内容。雷达波流速仪测流技术有流速越大,测量越准确的优点。文章运用FLOW-3D数值模拟软件研究其在某渡槽矩形槽身段且有壅水时测流的适用性。得到结论,矩形明渠在输水运行时会产生二次流,随着下游壅水的增大,二次流流态比较稳定,表面流速系数取值基本不受下游壅水的影响。但是水面流速系数与离上游边界条件距离具有稳定的函数关系,拟合成公式,求解出流量最大误差为1.17%。说明雷达波流速仪对大型矩形明渠测流的适用性与准确性。
The flow measurement of large-scale open channel is an important part of operation management.The current measurement technology of radar wave anemometer has the advantage that the greater the flow velocity is,the more accurate the measurement is.In this paper,the applicability of flow measurement in a rectangular trough with backwater is studied by using FLOW-3D numerical simulation software.It is concluded that the secondary flow will occur in the rectangular open channel during the operation of water conveyance.With the increase of the backwater in the lower reaches,the flow pattern of the secondary flow is relatively stable,and the value of the surface velocity coefficient is basically not affected by the backwater in the downstream.However,there is a stable functional relationship between the surface velocity coefficient and the distance from the upstream boundary conditions,and the maximum error of the flow is 1.17%,which explains the applicability and accuracy of radar wave anemometer for flow measurement in large rectangular open channel.
出处
《科技创新与应用》
2022年第10期164-168,共5页
Technology Innovation and Application
关键词
输水明渠
测流技术
FLOW-3D
二次流
水面流速系数
open channel for water conveyance
flow measurement technology
FLOW-3D
secondary flow
surface velocity coefficient
