Numerical simulation of fluid flow in the injection nozzle

Namen diplomske naloge je bil raziskati tokovne razmere znotraj izvrtine za vbrizg goriva oziroma v vbrizgalni šobi pri uporabi računskih mrež različnih gostot. Izbrati smo morali pravo mrežo, zato smo preračune naredili na redki, srednji in gosti mreži. Diskretizacijo smo naredili z Richardsonovo ekstrapolacijo. Za nadaljnjo analizo smo izbrali srednjo mrežo, ki je podala kompromis med časom izračuna ter kvaliteto izračuna. To mrežo smo nato uporabili za simulacijo pri dveh različnih tlakih. Rezultate obeh tlakov smo primerjali na dveh robnih pogojih, simetriji in izstopu ter prikazali pri štirih različnih časih, kateri so najlepše prikazali spremembo vpadne faze.The purpose of the thesis was to investigate the current conditions inside the fuel injector nozzle when using computational networks of different densities. We had to choose the right network, so we made calculations on the rare, medium and hosted network. Discretization was done with Richardson\u27s extrapolation. For further analysis, we selected a medium network that compromised during the calculation time and the quality of the calculation. This network was then used for simulation at two different pressures. The results of the two pressures were compared on two boundary conditions, symmetry and outlet, and were shown at four different times, which best illustrated the change of the incident phase