Vertical distribution of streamwise velocity and its prediction in Ushaped channel
YANG Shi-Hong1, HAN Jin-Xu2, PENG Shi-Zhang1, GAO Xiao-Li1, GU Hong3, LI Jiang-An3
(1. State Key Laboratory of HydrologyWater Resources and Hydraulic Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Yellow River Institute of Hydraulic Research, Zhengzhou, Henan 450003, China; 3. Gaoyou Municipal Water Affairs Bureau, Gaoyou, Jiangsu 225600, China)
Abstract:To find a guide to water management in field irrigation, the vertical distribution of streamwise velocity in a Ushaped open channel was clarified by means of indoor and field experiments. In addition, a twopower law for such a distribution was established by using the law of velocity in asymmetric closed channel. The methods for defining the parameters in the twopower law were given, and then the law was validated by the experimental data. The results showed that the flow velocity was lowered with increasing water depth, but the peak velocity appeared under the free surface. The predicted velocity distribution by the twopower law agreed with the experimental data in the 0.10-0.95 dimensionless depth so well that the error was as small as 5%, suggesting the law can involve the effect of free surface and channel wall. Compared with the traditional law of velocity distribution, the twopower law is more accurate, and may be used in an open channel with a crosssection of other shape.
杨士红, 韩金旭, 彭世彰, 高晓丽, 顾宏, 李江安. U形渠道水流流速垂向分布规律及模拟[J]. 排灌机械工程学报, 2012, 30(3): 309-314.
YANG Shi-Hong, HAN Jin-Xu, PENG Shi-Zhang, GAO Xiao-Li, GU Hong, LI Jiang-An. Vertical distribution of streamwise velocity and its prediction in Ushaped channel. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(3): 309-314.
参考文献(References)[1]王泽, 张静. 有植被突扩明渠水流特性试验[J]. 排灌机械工程学报, 2011,29(1):45-49.Wang Ze, Zhang Jing. Experiment on hydraulic characteristics of suddenexpansion channel with vegetation[J]. Journal of Drainage and Irrigation Machinery Engineering, 2011,29(1):45-49.(in Chinese)[2]胡云进, 万五一, 蔡甫款, 等. 窄深矩形断面明渠流速分布的研究[J]. 浙江大学学报:工学版, 2008,42(1):183-187.Hu Yunjin, Wan Wuyi, Cai Fukuan, et al. Velocity distribution in narrow and deep rectangular open channels[J]. Journal of Zhejiang University: Engineering Science, 2008,42(1):183-187.(in Chinese)[3]孜拉吾东, 孙东坡, 张雁杰, 等. 梯拱形渠道流速横向分布规律及流量量测[J]. 武汉大学学报:工学版, 2008,41(1):55-59.Zilaw Dun, Sun Dongpo, Zhang Yanjie, et al. Law of lateral velocity distribution in trapeziumarch channel and discharge measurement[J]. Engineering Journal of Wuhan University, 2008,41(1):55-59.(in Chinese)[4]严军, 王二平, 孙东坡, 等. 矩形断面明渠流速分布特性的试验研究[J]. 武汉大学学报:工学版, 2005,38(5):59-64.Yan Jun, Wang Erping, Sun Dongpo, et al. Experimental study on distribution properties of velocity in rectangular open channel[J]. Engineering Journal of Wuhan University, 2005,38(5):59-64.(in Chinese)[5]Tsai W F, Ettema R. Modified eddy viscosity model in fully developed asymmetric channel flows[J]. Journal of Engineering Mechanics, 1994,120(4):720-732.[6]王志兴, 李成振, 陈刚. 冰盖下水流流速垂向分布规律研究[J]. 沈阳农业大学学报, 2009,40(4):465-470.Wang Zhixing, Li Chengzhen, Chen Gang. Law of water velocity vertical distribution under icecover[J]. Journal of Shenyang Agricultural University, 2009,40(4):465-470.(in Chinese)[7]Yan Jing, Tang Hongwu, Xiao Yang, et al. Experimental study on influence of boundary on location of maximum velocity in open channel flows[J]. Water Science and Engineering, 2011,4(2):185-191.[8]胡旭跃, 程永舟, 刘斌, 等. 明渠水流边壁影响修正的计算方法[J]. 泥沙研究, 2010(5):55-58.Hu Xuyue, Cheng Yongzhou, Liu Bin, et al. Sidewall correction method of openchannel flows[J]. Journal of Sediment Research, 2010(5):55-58.(in Chinese)[9]赵振兴, 何建京. 水力学[M]. 北京: 清华大学出版社, 2010.[10]蔡甫款. 明渠流量测量的关键技术研究[D]. 杭州:浙江大学建筑工程学院, 2006.