低水头大流量倒虹吸进口掺气及通气孔设置问题研究

Study on Aeration and Air Hole Place in a Low Water Head and Great Flow Rater Inverted Siphon System

通过南水北调中线工程淇河渠道倒虹吸模型试验 ,对低水头大流量倒虹吸进口掺气及通气孔设置问题进行了研究 ,结果表明 :无论控制闸宜设在上游或下游 ,不存在进口水跃问题 ,上游设闸控制虽有掺气问题 ,但是量小无害 ,因此 ,低水头大流量倒虹吸管进口不需要设置通气孔。

Through a model test for Qihe river inverted siphon system, aeration problem and air hole place for a low water head and great flow rate inverted siphon system were studied. Experimental results showed that there was not hydraulic jump in inlet, regardless a control gate is installed in the inlet or in the outlet. Though aeration phenomenon sometime occurred when a control gate was set in the inlet, it has little harm for whole system. It also can be concluded that an air hole in the inlet is not necessary for a low water head and great flow rate inverted siphon system.