Page 119 - 《水资源与水工程学报》2024年第2期
P. 119
!35 "!2 # & ' ( ) & * + , - Vol.35No.2
2024 $ 4 % JournalofWaterResources&WaterEngineering Apr.,2024
DOI:10.11705/j.issn.1672-643X.2024.02.13
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GHIJK:TV653 LMNOP:A LQRK:1672643X(2024)02011507
Hydrauliccharacteristicsofswirlingblockingcomposite
internalenergydissipatorwithhighwaterhead
1,2
3
4
3
WANGLijie ,LIQilong,ZHANGPengjun,LIJiangbo
(1.HunanProvincialKeyLaboratoryofHydropowerDevelopmentKeyTechnology,Changsha410014,China;2.POWERCHINA
ZhongnanEngineeringCorporationLimited,Changsha410014,China;3.SchoolofWaterResourcesandHydroelectricEngineering,
Xi’anUniversityofTechnology,Xi’an710048,China;4.CSCECAECOMConsultantsCo.,Ltd.,Lanzhou730000,China)
Abstract:Theswirlingblockingcompositeinternalenergydissipatorisanovelenergydissipatorwhichis
applicabletotheflooddischargeandenergydissipationofhighdams.Inordertoanalyzeitsapplication
totheflooddischargeandenergydissipationofdamswithultrahighwaterhead,itshydrauliccharacteris
ticsundertheconditionof200mwaterheadarestudiedbymeansofphysicalmodeltestandnumerical
simulation.Theresultsshowthatwiththeapplicationofthisnoveldissipator ,thedischargeis1547
3
m /s,whichisslightlylargerthanthedesignvaluebutcanstillmeetthedischargerequirements.There
isastableswirlingflowinthecavity,andthediameterofthecavityintheswirlingsectionisabout6-7
meters,withaswirlingangleofabout60°.Intheswirlingsection,thewallpressureisabout110×9.8
kPa ,andthemaximumpointvelocityisabout45m/s.Thereisalowfrequencypulsationbetweenthe
swirlingflowgeneratorandtheswirlingsection,whichis0.050to0.274Hz,andthecavitationnumber
isgreaterthan1.2,indicatingthatthedischargeoperationissafe.Theminimuminstantaneousnegative
pressureattheendoftheblockingdiffusionsectionis-3.81×9.8kPa,andthecavitationnumberof
theflowissmall ;however,thepossibilityofcavitationwouldbegreatlyreducedduetothehighaeration
rateoftheflow.Thedominantfrequencyoftheflowattheendofthediffusionsectionis46.99Hzand
thetotalenergydissipationrateisashighas82.1%.Theresearchresultscanprovidesomereferencefor
theapplicationofthecompositeenergydissipatortotheflooddischargeandenergydissipationofdams
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