Abstract：An experimental study was carried out on the rectangular channel water separation with a side weir under the different channel width ratios. Five kinds of flow were selected in the experiments. Under each flow rate, the different diversion ratios were obtained by adjusting the downstream water depth of the main channel. A total of 75 groups of experiments were carried out. The water depth and other hydraulic factors near the water diversion were measured, and the water surfaces near the water diversion were obtained. According to the weir flow formula, the relationship between the discharge coefficient and the head of the relative weir is fitted at each channel width ratio. The results show that the variation of water surfaces at the water-diversion are approximately the same under different flow rates, and the water surface change is different with the distance from water-diversion. Under the same channel width ratio and the flow rate, the diversion ratio is linearly related to the water head on the relative weir, and increases with the increase of the relative water head on the weir and decreases with the increase of the Froude number of the main channel upstream and downstream. The accuracy of the calculated formula of the flow coefficient is higher and the correlation coefficient is more than 0.9, which meets the accuracy requirement of flow measurement. A preliminary study on hydraulic performance at the water-diversion was carried out, in attempt to provide reference for discharge measurement in irrigation areas.
刘海强, 王文娥*, 胡笑涛. 矩形渠道分水口水力性能试验研究[J]. 排灌机械工程学报, 2018, 36(10): 1012-1016.
LIU Haiqiang, WANG Wen′e*, HU Xiaotao. Experimental study on hydraulic characteristics of rectangular water-diversion. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(10): 1012-1016.
[1]张成,郑立松,黄成涛,等.大型输水渠道分水口分水影响及调控原则研究[J].应用基础与工程科学学报,2012,20(6):975-986. ZHANG Cheng,ZHENG Lisong,HUANG Chengtao,et al.Influence and principle of water division operation of flow diversion gate in large water transfer channel[J].Journal of basic science and engineering,2012,20(6):975-986.(in Chinese)[2]KESSERWANI GHOSTINE R,VAZQUEZ J, et al. One-dimensional simulation of supercritical flow at a confluence by means of a nonlinear junction model applied with the RKDG2 method[J].International journal for numerical methods in fluids,2008,57(12):1695-1708.[3]RABIH Ghostine PhD,JOSE Vazquez, ABDELALI Terfous, et al.Comparative study of 1D and 2D flow simulations at open-channel junctions[J].Journal of hydraulic research,2012,50(2):164-170.[4]AL Omari N K, KHALEEL M S. Laboratory study of the effect of the branching angle and the branching channel slope on flow[J].Al-rafadain engineering journal, 2012,20(5):33-41.
