Page 150 - 《水资源与水工程学报》2023年第4期
P. 150

!34 " ! 4 #                       & ' ( ) & * + , -                               Vol.34No.4
               2023 $ 8%                JournalofWaterResources&WaterEngineering                 Aug.,2023

            DOI:10.11705/j.issn.1672-643X.2023.04.17


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                 MNOPQ:TV135.2   7RSTU:A    7VWQ:1672643X(2023)04014606

                           Influenceofshapeparametersofdischargestructureon

                                 hydrauliccharacteristicsofhighgravitydams

                                   GOUWenjuan,LUOLiwei,LIHuiping,PANJunfeng
                   (StateKeyLaboratoryofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin300072,China)
                 Abstract:Forhighgravitydams,thedischargestructuredeterminestheenergydissipationcharacteristics
                 ofthedischargeflow ,whichinturnaffectsthesafeoperationofthehydropowerstation.Ahydraulicmod
                 eltestwasadoptedinordertoinvestigatetheeffectoftheshapeparametersofthedischargestructureon
                 thehydrauliccharacteristicsofthedischargeflow.Thetestresultsshowthatthedecreaseoftheplunge
                 poollengthreducesthediffusionspaceofthesubmergedimpactjetandincreasestheturbulenceinthe
                 impactzone ,whichresultsinareductionintheminimumtimeaveragedpressureofthebottomslabin
                 theplungepool.Inaddition ,itleadstoanincrementofthepeakrootmeansquare(RMS)ofthefluctua
                 tionpressureonthebottomslabandincreasesitssafetyrisks.Thedecreaseinthelengthofthesecondary
                 stillingpoolleadstoanincrementintheunderflowvelocityattheoutfluxofthestillingpoolandincreases
                 thescouringrisksofthedownstream.Moreover ,thereductionintheheightoftheauxiliaryweirresultsin
                 adecreaseinthetimeaveragedpressureandanincrementinthepeakRMSofthefluctuatingpressure
                 andsafetyrisksofthebottomslab.Italsoresultsinanincrementinthewaterdepthofthesecondary
                 stillingpoolandadecreaseintheunderflowvelocityatthebottomofthejumpzone.Meanwhile ,thetur
                 bulentintensityandthepeakvalueofthe RMSofthefluctuationpressuredecreasebuttheunderflowve
                 locityatthepooloutfluxincreases.
                 Keywords:energydissipation;plungepool;secondarystillingpool;shapeparameter;hydraulicchar
                 acteristics ;highgravitydam

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