Investigation of the Influence of Floodwater due to Destruction of Hydraulic Penstocks on Plant Buildings in Diversion-type Hydropower Station
A physical model test was carried out to study the influence of floodwater due to destruction of hydraulic penstocks on plant buildings in diversion-type hydropower station.In the experiment,the flow pattern of floodwater caused by penstocks failure under the condition of partial rupture and complete rupture was compared.The influence of the response time of the upstream incoming flow system and the water volume of the forebay on the burst penstocks floodwater hydraulic parameter was studied.The results show that there are obvious differences between partial rupture and complete rupture in water flow process,inundation process and impact load on downstream buildings.When the pen-stocks are partially broken,water flows out along the circumferential notch,forming a large number of spalling water droplets that cover the power plant and water treatment chamber.At this time,there is no obvious impact load on the buildings.When the penstocks are completely broken,the water flow directly into the downstream building and climb to a greater height along the building wall,which produces a greater impact load on the bottom of the building.The maxi-mum flooding depth of downstream buildings caused is related to the water volume of the forebay.The maximum impact load is related to the water volume of the forebay.When the penstocks are partially broken,timely closing the emergency gate can effectively reduce the duration of building inundation.The results can provide reference for the emergency plan of the floodwater due to destruction of hydraulic penstocks on plant buildings in diversion-type hydropower station.
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