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利用单点三维流速测量仪(ADV)对顺直明渠岸边侧向45°取水口的近区水域进行了三维流速测量。以分流流速比η为主要参数,分析了取水口近区水域的水力特性,包括取水分流宽度、分槽回流特性及口门断面紊动特性等。将本文的部分试验结果与90°取水口的结果进行了对比,结果表明45°取水口附近的水流更加平顺,口门断面处的流速分布更加均匀,分槽内净进流宽度更大。
A three-dimensional flow velocity measurement was carried out by using a single-point three-dimensional flow velocity measuring instrument (ADV) in the waters near the bank of the straight waterway of 45 ° along the straight open channel. Taking the split flow rate ratio η as the main parameter, the hydraulic characteristics of the near water area of the water intake were analyzed, including the width of water diversion, the characteristics of sub-tank backflow and the turbulent characteristics of the mouth section. The results of some experiments in this paper are compared with those of the 90 ° water intake. The results show that the water flow around the 45 ° water intake is smoother and the flow velocity distribution is more uniform at the cross-sectional area.