20.500.12556/RUL-131152 Numerična simulacija hipotetične nezgode izgube hlajenja v fuzijskem reaktorju Numerical simulation of a hypothetical loss of coolant accident in a fusion reactor Pri hipotetični nezgodi izgube hlajenja v fuzijskem reaktorju, zaradi giljotinskega zloma cevi hladilnega sistema izven vakuumske posode, predpostavimo takojšnjo izgubo hlajenja oplodnih oblog v enem sektorju tokamaka. Zaradi aktivacije materialov moramo zaostalo toploto iz reaktorja odvajati tudi po zaustavitvi. V ta namen po izgubi hlajenja v vakuumsko posodo vpihnemo suh, hladen zrak. Ko se vzpostavi naravna konvekcija, kroženje zraka med vročimi in hladnimi deli reaktorske posode zagotovi pasiven mehanizem prenosa toplote med vročimi komponentami ter hladnimi okoliškimi površinami. Z uporabo programa za računsko dinamiko tekočin ANSYS Fluent smo izvedli numerično analizo segrevanja prizadetega segmenta oplodnih oblog v DEMO reaktorju. Uporabili smo sklopljen model vezanega prenosa toplote v tekočini in trdnini z upoštevanjem toplotnega sevanja. Pokazali smo, da z naravno konvekcijo vpihanega zraka zagotavljamo zadostno hlajenje oplodnih oblog, katerih temperatura sicer sprva nekoliko naraste, nato pa se sistem začne ohlajati. In a hypothetical loss of coolant accident, a guillotine break of a coolant line occurs outside the vacuum vessel, that causes instantaneous loss of cooling of breeding blankets in one sector of the tokamak. Due to the material activation, residual heat must be dissipated from the reactor even after the reactor shutdown. With additional cooling functions, potential damage to the in vessel components of the reactor due to overheating can be prevented. For this purpose, dry air is injected into the vacuum vessel to facilitate convective cooling of the affected components. A numerical analysis of the cooling of the affected sector of the DEMO reactor has been performed, using the ANSYS Fluent computational fluid dynamics software. A conjugate heat transfer model for fluids and solids was used, with the inclusion of thermal radiation. The analysis showed that natural convection of the air provides sufficient cooling of the breeding blankets. The temperature of the blankets initially rises, then the system starts to cool down. fuzijska elektrarna reaktor DEMO nezgoda izgube hlajenja oplodna obloga naravna konvekcija računska dinamika tekočin fusion power plant reactor DEMO loss of coolant accident breeding blanket natural convection computational fluid dynamics true false false Slovenski jezik Angleški jezik Zaključna naloga 2021-09-23 08:15:09 2021-09-23 08:15:11 2022-09-10 04:10:16 0000-00-00 00:00:00 2021 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 120815 77575427 3490.pdf 3490.pdf 1 F19D00B237E4A51FC7BBB514EA5CC53A 1be47806b19a4f5c06eab7bfd85282971df57ae6e03141ab07f2f2c88d6e191f 5688fcb6-1c35-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=148411 Fakulteta za matematiko in fiziko 0 0 0