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Studyontheinfluenceoftheexpansionangleofthesideinlet?outletroof
onthevelocitydistributionofthetrashracksection
GAOXueping,ZENGQingkang,ZHUHongtao,LIUYinzhu
(StateKeyLaboratoryofHydraulicEngineeringSimulationandSafety,TianjinUniversity,Tianjin 300072,China)
Abstract:Thetwo - wayflowofthesideinlet?outletofthepumpedstoragepowerstation,thesizeoftheroofex
pansionanglewilldirectlyaffecttheuniformityoftheflowvelocitydistributionofthetrashracksection,andeven
thereverseflowvelocity.Thedesigncodeofpumpedstoragepowerstationtakes3°~5°astherecommendedrange
ofexpansionangleofsideinlet?outletroof,whichisbasedontheexpansionanglewiththesmallestresistancecoef
ficientofrectangulardiffuser.However,theshapeofsideinlet?outletismuchmorecomplicated,soitisnecessary
tofurtherexplore.Inthispaper ,asideinlet?outletshapeistakenastheresearchobject,andthenumericalsimu
lationmethodisusedtostudytheinfluenceoftheroofexpansionangleof11anglesontheflowvelocitydistribution
ofthetrashracksectionundertheoutflowconditionandtheinflowcondition.Theresultsshowthatundertheout
flowcondition ,withtheincreaseoftheexpansionangleoftheroof,themainstream positionofthemiddle - hole
trashracksectiongraduallydecreasesfromthemiddletothebottom ,andtheflowvelocitydistributionofthesec
tiontendsfrombasicallysymmetricaltoasymmetricalwithlargeratbottomandsmalleronthetop.Whentheexpan
sionangleoftheroofislarge,thereverseflowvelocityappearsintheupperpartofthemiddle - holetrashracksec
tion.Withtheincreaseoftheexpansionangleoftheroof ,thevelocitydistributionofthesideholetrashracksection
graduallychangesfromthebasicuniformitytotheunevendistributionofthebottomandtheupperpart.Withthein
creaseoftheroofexpansionangle ,thenon - uniformitycoefficientoftheflowvelocityattheorificesofthemiddleand
sideholesgraduallyincreases ,buttheflowvelocitydistributionofthemiddleholetrashracksectionismoreaffected
bytheroofexpansionangle.Intheinflowcondition,withtheincreaseoftheroofexpansionangle,thevelocitydis
tributionofthemiddleandsideholetrashracksectionandthenon - uniformitycoefficientoftheorificevelocityhave
noobviousinfluence.Theresearchresultscanprovideguidanceforoptimizingthedesignofsideinlet?outlet.
Keywords:pumpedstoragestation;sideinlet?outlet;roofexpansionangle;theflowvelocityoftrashracksec
tion;numericalsimulation
(责任编辑:李福田)
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