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毂帽鳍对调距桨推进效率影响的数值研究(英文).docx

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毂帽鳍对调距桨推进效率影响的数值研究(英文) NumericalStudyontheEffectofHubCapFinsandSkewedPropellersonPropulsionEfficiency Inthedesignandoptimizationofshippropellers,itiscrucialtoconsidervariousfactorsthatcanaffectpropulsionefficiency.Twoofsuchfactorsarethehubcapfinsandskewedpropellers.Thispaperpresentsanumericalstudyontheireffectonpropulsionefficiency. Firstly,letusbrieflyintroducethesetwoconcepts.Hubcapfinsaresmallfinsattachedtothehubofapropeller.Theirpurposeistocontroltheflowofwateraroundthehubandreducetheturbulence,whichcanimprovepropulsionefficiency.Skewedpropellers,ontheotherhand,havebladesthataretwistedorangledaroundtheaxisofrotation.Thisdesigncanreducethepressurevariationonthebladesandincreasetheangleofattack,leadingtohigherthrustandpropulsionefficiency. Toinvestigatetheeffectofhubcapfinsandskewedpropellers,weconductednumericalsimulationsusingathree-dimensionalNavier-Stokessolver.Wemodeledapropellerwithandwithouthubcapfins,andanotherpropellerwithandwithoutskew.Theoperatingconditionswerekeptconstant,andthesimulationresultswerecomparedtoanalyzetheeffectofthesedesignfeaturesonthepropulsionefficiency. Theresultsshowthattheadditionofhubcapfinscanindeedimprovepropulsionefficiency.Whenthefinswerepresent,theflowaroundthehubwassmootherandlessturbulent.Thisreducedthedragforceonthepropellerandincreasedthethrust,resultinginahigherpropulsionefficiency.Theimprovementinefficiencywasmoresignificantatlowerspeeds,wherethedragforceonthehubisrelativelyhigher. Similarly,theresultsindicatethatskewedpropellerscanalsoenhancepropulsionefficiency.Comparedtothestraightdesign,theskewedpropellergeneratedhigherthrustatthesameoperatingconditions.Thisisduetothebetterpressuredistributiononthebladesandtheincreasedangleofattack.However,theimprovementinefficiencywaslesspronouncedthanthatofthehubcapfins. Itisworthnotingthattherearesomelimitationsanduncertaintiesinnumericalsimulations.Theaccuracyoftheresultsisaffectedbythemeshquality,numericalalgorithms,andboundaryconditions.Therefore,experimentalvalidationisnecessa