20.500.12556/RUL-171414 Numerična in eksperimentalna analiza vrtinčnega zračnega pršenja Numerical and experimental analysis of swirling air blast atomisation V magistrskem delu smo razvili tri-razsežni numerični model za analizo atomizacije nestisljive newtonske kapljevine z idealnim potisnim plinom s programom Ansys Fluent. Numerično reševanje temelji na metodi kontrolnih volumnov v treh dimenzijah z metodo volumna tekočine, ki vključuje geometrijsko rekonstrukcijo stične površine. Turbulenca je modelirana z modelom k-ω SST. Za primarni razpad kapelj je uporabljena Euler-Eulerjeva formulacija delcev. Posamezne kaplje po primarnem razpadu so pretvorjene v Euler-Lagrangeovo formulacijo diskretnih delcev. Sekundarni razpad je modeliran z uporabo modela razpada diskretnih delcev KHRT. Skonstruirana je bila eksperimentalna naprava, s katero smo izmerili kot pršenja za ureo s pretokom 0,0463 l/s in zrakom z nadtlakom 2 bar. Kot pršenja je bil določen iz posnetka pršenja z v ta namen razvito programsko kodo. Numerični model omogoči analizo veličin, ki se eksperimentalno težko določijo zaradi zapletene narave obravnavanega dvofaznega sistema. Izračunali smo hitrost toka, velikostno porazdelitev kapelj v osni in radialni smeri ter dolžino jedra uree. Izračunana velikost kapelj je bila primerjana s tehnično dokumentacijo šobe. Razviti numerični model ustrezno popiše kot pršenja in velikost kapelj, ki sta tehnološko najbolj pomembni veličini za proces selektivne ne-katalitične redukcije, kjer se uporabljajo tovrstni sistemi. In this master's thesis, a three-dimensional numerical model was developed to analyse the atomisation of an incompressible Newtonian fluid with an ideal gas propellant with the Ansys Fluent software. The numerical solution is based on the finite volume method in three dimensions with the volume of fluid method, which includes geometric reconstruction of the contact surface. Turbulence is modelled using the k-ω SST model. The primary droplet breakup is modelled using the Euler-Euler formulation. After the primary breakup, individual droplets are transferred to the Euler-Lagrange discrete particle formulation. The secondary breakup is modelled using the KHRT discrete particle breakup model. An experimental apparatus was constructed to measure the spray angle of urea solution at a liquid flow rate of 0.0463 l/s and air at an overpressure of 2 bar. The spray angle was determined from the spray image using a program code developed for this purpose. The numerical model enables the analysis of quantities that are difficult to determine experimentally due to the complex nature of the two-phase system under consideration. We calculated the flow velocity, droplet size distribution in the axial and radial directions and the urea core length. The calculated droplet size was compared with the technical documentation of the nozzle. The developed numerical model adequately describes the spray angle and droplet size, which are the technologically most important quantities for the selective non-catalytic reduction process where such systems are used. atomizacija numerični modeli kaplje diskretni delci selektivna ne-katalitična redukcija atomisation numerical models droplets discrete particles selective non-catalytic reduction true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2025-08-26 08:30:25 2025-08-26 08:30:33 2025-09-01 03:44:45 0000-00-00 00:00:00 2025 0 0 XXII, 83 str. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 532.517:66.069.832:519.6(043.2) 274714 246928387 42938.pdf 42938.pdf 1 8D43227F9976A9F62BC2B50742D24327 b2a00c01f5b2529e7d24da4f0fdeb9a02a93e85763c294a444ad6189bdd6bcd4 0c2faf45-8246-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=214728 Fakulteta za strojništvo 0 0 0