上游边坡系数对折线型实用堰流量系数的影响  

Effects of slope coefficient in the upstream side on the discharge coefficient of broken-line practical weirs

作　　者：陈月君[1] 顾晓峰 傅宗甫[1] 陈青生[1] 崔贞[1] CHEN Yuejun;GU Xiaofeng;FU Zongfu;CHEN Qingsheng;CUI Zhen(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Jiangsu Tai Lake Water Conservancy Planning Design Institute Co.,Ltd.,Suzhou 215128,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]江苏省太湖水利规划设计研究院有限公司,江苏苏州215128

出　　处：《河海大学学报（自然科学版）》2018年第5期425-432,共8页Journal of Hohai University(Natural Sciences)

基　　金：中央高校基本科研业务费专项(2017B625X14);江苏省研究生科研与实践创新计划(KYCX17_0439);江苏高校优势学科建设工程资助项目(YS11001)

摘　　要：为系统地分析无侧收缩折线型实用堰(简称折线堰)上游边坡系数对自由堰流流量系数的影响规律,采用VOF(volume of fluid method)方法和RNG k-ε紊流模型对下游边坡直立、上游边坡系数依次为0、0.3、0.5、0.8、1.0、1.5和2.0的7个折线堰模型进行数值模拟。数值模拟结果表明,随着堰顶总水头的增加,水面线曲率减小,流量系数增大,同时上游边坡系数对流量系数的影响逐渐减小。采用多元非线性回归方法建立了含有上游边坡系数的折线堰流量系数计算公式,该公式在堰顶总水头一定时,流量系数随着上游边坡系数先增大后减小。To systemically study the effect of varying slope coefficients in the upstream side on the discharge coefficient at free overflow over a broken-line practical weir with vertical downstream face and without lateral contraction,different slope coefficients of upstream side,including 0,0.3,0.5,0.8,1.0,1.5 and 2.0,are simulated by the volume of fraction(VOF)method and the RNG k-εturbulence model.Numerical results show that the rising of total head H0 reduces the curvature of free surface profile and increases the discharge coefficient.Meanwhile,the influence of slopes in upstream side on the discharge coefficient decreases with H0.Furthermore,a discharge coefficient formula including the variable slope coefficient of upstream side is derived based on the method of non-linear regression,in which as the slope coefficient of upstream side increases,the discharge coefficient increases firstly and then decreases for a given H0.

关 键 词：折线型实用堰 自由堰流 数值模拟 VOF方法 上游边坡系数 水面线 流量系数 

分 类 号：TV65[水利工程—水利水电工程] TV132.22