Page 128 - 《水资源与水工程学报》2022年第5期
P. 128

! 33 " ! 5 #                      & ' ( ) & * + , -                               Vol.33No.5
               2022 $ 10 %              JournalofWaterResources&WaterEngineering                 Oct.,2022

            DOI:10.11705/j.issn.1672-643X.2022.05.15


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                 HIJKL:TV132 .1   MNOPQ:A    MRSL:1672643X(2022)05012407
                        Numericalsimulationoftheverticaljetincircularpipewith

                                       negativebuoyanteffectinstillwater

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                 HUYushan,ZHANGRengong,SUNCan,ZHENGFuxiang,WANGSheng,YINZegao
               (1.ZhejiangTongjiVocationalCollegeofScienceandTechnology,Hangzhou311231,China;2.ZhejiangYugongInformation
                TechnologyCo.,Ltd.,Hangzhou310000,China;3.CollegeofEngineering,OceanUniversityofChina,Qingdao266100,
                      China;4.CCCCNationalEngineeringResearchCenterofDredgingCo.,Ltd.,Shanghai201208,China)
                 Abstract:Athreedimensionalhydrodynamicmathematicalmodelandphysicalexperimentofthevertical
                 jetincircularpipewithnegativebuoyanteffectwasconductedinstillwater,andthecalculatednondi
                 mensionalverticalvelocityofthemodelwasingoodagreementwiththatoftheexperiment.Then ,thehy
                 drodynamiccharacteristicsofthenegativebuoyantjetwasanalyzedaccordingly.Theresultsshowedthat
                 withtheincreaseoftheinitialjetvelocityandthedecreaseoftheinitialjetdensityandthenozzleexitdi
                 ameter ,themaximumrisingheightandthesteadyheightincreased;however,theinitialjetvelocityand
                 initialjetdensityhadinsignificantinfluenceonthetimeandrateoftheverticalvelocitydecayatthecen
                 tralline.Withtheincreaseoftheinitialjetdensity ,theverticalvelocitydecayatthecentrallinetended
                 toarrivelateandthedecayrateincreased ;whereasithappenedearlyandtheratedecreasedatthemo
                 mentofbothmaximumrisingheightandsteadyheightwiththeincreaseofthenozzleexitdiameterforthe
                 scenarioofsteadyheight.Basedonthefindings,thedensityFroudenumberwasusedtoobtainthedi
                 mensionlesslinearrelationshipformulasforpredictingthemaximumrisingheightandthesteadyheightre
                 spectively.Theratioofthemaximumrisingheighttothesteadyheightwasclosetotheconstantof1.52 ,
                 whichwasroughlyindependentofthedensityFroudenumber.Theresearchaimstoshedsomelighton
                 thedesignandengineeringapplicationoftheverticaljetwithnegativebuoyanteffectinstillwater.
                 Keywords:stillwater;verticalcircularpipe;negativebuoyantjet;jetheight;verticalvelocityatthe

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