Experimental and numerical simulation study on hydraulic performance of weir-flume combination facility
In order to investigate the hydraulic properties and applicability of the weir-flume combina-tion facilities,3 groups of slopes(0.1％,0.4％,0.8％)and 9 groups of flow rates were designed to conduct hydraulic performance tests by combining modeling tests with numerical simulations.The appli-cability of numerical simulation for weir-flume combination was verified,and the flow measurement mechanism of weir-flume combination devices under different bottom slopes was explored.The results show that the relative water depths of three groups of slope thresholds are 0.880,0.930 and 0.873,and the accuracy of the flow measurement formulas is high,with corresponding average errors of 1.20％,1.69％and 1.74％,respectively.Under different slopes,the water depth in the measuring flume de-creases along the course,and the average longitudinal velocity increases along the course.When the flow rate is less than the threshold flow rate,the comprehensive flow coefficient and the average longi-tudinal velocity increases with the increase of the flow rate.When the flow rate is greater than the threshold flow rate,the size is consistent near the average longitudinal velocity in the 1/3 upstream of the transition section,the flow coefficient and the average longitudinal velocity of the upstream decrease with the increase of the flow rate,while the average longitudinal velocity of the downstream increases with the increase of the flow rate.The maximum error of numerical simulation results is 4.16％,which is consistent with the test,and the numerical simulation is suitable for the study of weir-flume combination water measuring facilities.
weir-flume combinationflow measurementnumerical simulationhydraulic propertiesflow-measuring formula
万方数据
维普
