Turbulentās plūsmas raksturlielumu izpēte šķidrā metāla mērķī
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Latvijas Universitāte
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Abstract
Neitronu „atskaldīšana” tiek plaši izmantota dažādu materiālu pētniecībā un izstrādē, medicīnas jomā un dažādos fundamentālos pētījumos. Augstražīgās iekārtās šajā procesā izdalās liels siltuma daudzums, tādēļ siltuma aizvadīšana no darba zonas ir viens no svarīgākajiem aspektiem šķidrā metāla mērķa dizaina optimizācijā.
Darbā tika veikti PIV mērījumi laboratorijas iekārtā ar ūdeni, kas sniedz priekšstatu par plūsmas raksturu un nodrošina skaitlisko aprēķinu (RANS un LES pieejas) eksperimentālās validēšanas iespējas. Mērījumu rezultātos parādītas turbulentās enerģijas ģenerācijas zonas, kas labi saskan ar teorētiskajiem priekšstatiem.
Aprēķinu rezultāti parāda plaši pielietoto RANS turbulences modeļu nepilnības, savukārt LES aprēķinu rezultāti labāk atspoguļo pētāmos procesus.
Neutron spallation is widely used in various branches– material investigation, medicine and fundamental science. In powerful installations for this process high heat amount is generated, therefore heat removal from active zone is one of most important factors for optimization of liquid metal target design. In this work in laboratory equipment with water PIV measurements were carried out, which gives possibility for experimental validation of numerical calculations using RANS and LES approaches. Measurement results shows zones of active turbulence energy generation, which is in good agreement with theoretical concept. Numerical results shows imperfections of widely used RANS turbulence models, while LES calculation results describes investigated processes better.
Neutron spallation is widely used in various branches– material investigation, medicine and fundamental science. In powerful installations for this process high heat amount is generated, therefore heat removal from active zone is one of most important factors for optimization of liquid metal target design. In this work in laboratory equipment with water PIV measurements were carried out, which gives possibility for experimental validation of numerical calculations using RANS and LES approaches. Measurement results shows zones of active turbulence energy generation, which is in good agreement with theoretical concept. Numerical results shows imperfections of widely used RANS turbulence models, while LES calculation results describes investigated processes better.