Study of Hydraulic Characteristics of Inverted Siphons with Large Flows
In order to ensure large-flow inverted siphon can transport water safely and stably,fluid dynamics software(CFD)was used to numerically simulate a three-dimensional mathematical model of an engineering.Physical model tests was used to analyze the characteristics of water flow change during inverted siphon filling and stabilized hydraulic charac-teristics.The results show that the maximum position of the inverted siphon flow velocity is located in the downhill sec-tion of the pipeline,and the maximum position of the pressure pressure is located in the horizontal section of the pipeline.During the water filling process,the water flow velocity in the inverted siphon edge pipeline is about 8%larger than that in the middle water.After the water flow was stabilized,there was a Karman vortex street phenomenon in the down-stream lock chamber of inverted siphon,resulting in water flow disorder and downstream water surface oscillation.So,it is necessary to extend the downstream gate pier or optimize the pier head structure to reduce the vortex strength and the influence of water surface oscillation.
inverted siphonhydraulic characteristicsnumerical simulationwater filling processKarman vortex street
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