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基于非定常涡格法的扑动频率对机翼涡和尾涡推力的影响.docx

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基于非定常涡格法的扑动频率对机翼涡和尾涡推力的影响 Title:ImpactofUnsteadyVortexSheddingonWingandTailVortexThrust:ANon-SteadyVortexGrid-BasedAnalysis Introduction: Inaerospaceengineering,thestudyofunsteadyvortexsheddinganditseffectsonwingandtailvortexthrustiscrucialforunderstandingtheaerodynamicperformanceofaircraft.Unsteadyvortexsheddingoccurswhenthereisaperiodicandoscillatoryseparationoftheflowfromthewingsortail,leadingtotheformationofvortices.Thesevorticesnotonlyaffecttheaircraft'sstabilitybutalsohaveasignificantimpactonitsoverallperformanceandmaneuverability. Methods: Onepopularmethodforanalyzingunsteadyvortexsheddinganditsimpactonwingandtailvortexthrustisthenon-steadyvortexgrid(NVG)technique.TheNVGtechniqueallowsforadetailedanalysisoftheflowdynamicsbydiscretizingthefluiddomainintoagridofvortices.Eachvortexonthegridisassignedastrengththatrepresentsitscontributiontotheoverallflowfield.Bysolvingthegoverningequationsoffluidmotionandvortexshedding,thetime-dependentbehaviorofthevorticesandtheirimpactonthrustcanbestudied. EffectsofUnsteadyVortexSheddingonWingVortexThrust: Theformationandsheddingofvorticesfromthewingplayacrucialroleinthegenerationofliftanddragforces.Unsteadyvortexsheddingcansignificantlyaffectthewingvortexthrustand,consequently,theaircraft'sperformance.Asthevorticesshedfromthewingsweepbackward,theyinduceadownwardvelocitycomponent,leadingtoalossinliftefficiency.Thiseffectiscommonlyknownasvortex-induceddrag.Understandingthefrequencyandamplitudeofunsteadyvortexsheddingisparamountinminimizingthenegativeimpactonwingvortexthrust. InfluenceonTailVortexThrust: Thetailofanaircraftgeneratesitsownvorticesduringflight,whichcontributetotheoverallthrust.Unsteadyvortexsheddingfromthetailcanaffectthedynamicsandperformanceoftheaircraft.Theinteractionbetweenthewingandtailvorticescanleadtoaerodynamicinterference,alteringtheeffectivenessandefficiencyofthetailvortices.Bystudyingthefrequencyandamplitudeofunsteadyvortexshedding,theoptimalpositioninganddesignofthetailcanbedeterminedformaximumthrustpro