摘要
为了探讨浮筒式升降闸门量水机理,理论分析了浮筒式升降闸门水力特性及流量计算表达式。实测流量与计算流量对比表明,浮筒式升降闸门流量公式测流精度较高且形式简单,适合末级渠道的量水。同时,采用数值分析对不同流量、不同闸门开度条件下的过闸水流流场进行模拟,讨论浮筒式升降闸门测流过程中渠道内的水面线情况、各控制断面的流速分布、闸前弗劳德数Fr以及闸门测流精度。结果表明:模拟流量、水深与实测流量、水深吻合较好;试验及数值模拟得到的闸门前弗劳德数Fr均小于0.5,满足测流要求。
In order to investigate the flow-measuring mechanism of the float lift gate,this paper analyzed the hydraulic characteristics of the float lift gate and derived the flow formula theoretically.The contrast result between the measurements and the calculations showed that the flow formula had high accuracy and simple form.And the flow formula was suitable for the flow measurement in the minor channel.Meanwhile,numerical analysis was used to simulate the flow field under different flow rates and gate openings.The water surface line,velocity structure of different sections,Froude number before the gate and flow measurement precision of the gate were discussed as well.The results showed that the simulated flow and water depth were in good agreement with the measured flow and water depth;the Froude number before the gate obtained by experiment and numerical simulation was less than 0.5,which can meet the flow measurement requirements.
作者
韩宇
忻佳丽
孙小雨
周炳旭
龙廷源
唐良川
HAN Yu;XIN Jia-li;SUN Xiao-yu;ZHOU Bing-xu;LONG Ting-yuan;TANG Liang-chuan(College of Water Resource and Civil Engineering, Chinese Agricultural University, Beijing 100083, China)
出处
《节水灌溉》
北大核心
2020年第3期21-26,32,共7页
Water Saving Irrigation
基金
国家自然科学基金面上项目(51979275)
“十三五”国家重点研发计划项目(2016YFC0400207,2017YFD0701003)
中央高校基本科研业务费(10710301,1071-31051012,1071-31051361)。
关键词
浮筒式升降闸门
水力特性
流量公式
数值模拟
float lift gate
hydraulic characteristics
flow formula
numerical simulation
