Status of Research on Water Hammer Effect in Long Distance Pressure Pipelines

In the long distance pressure pipeline, the sudden change of instantaneous pressure caused by the rapid change of liquid velocity is called water hammer, which seriously threatens the safe operation of hydropower station.  In this paper, the development and calculation methods of transient flow percussion theory are introduced, and different models and numerical methods are analyzed and compared. Finally, the problems in transient flow research and water hammer prevention measures are summarized, which is helpful to reduce the occurrence of water hammer accidents and guarantee the normal and stable operation of water supply pipeline system. This conclusion can provide reference for water hammer protection of long distance water supply system.