Experimental and numerical analysis of the cavitational flows around a hydrofoil

Namen prispevka je predstaviti analizo kavitacijskih tokovnih razmer okoli lopatičnega profila NACA. Predstavljen je fizikalno-matematični model v obliki Navier-Stokesovih enačb, zapisanih za fizikalne lastnosti zmesi voda - para in na podlagi prenosne enačbe za ohranitev mase vodne pare, s katero je bil modeliran nastanek, razsirjanje in izginjanje vodne pare v toku zmesi. Pri modeliranju fazne spremembe je bila uporabljena poenostavljena Rayleigh-Plessetova enačba, v kateri so upostevani parametri, ki pomembneje vplivajo na dinamiko tokovnih pojavov v bližini osamljenega krogelnega parnega mehurčka v obdajajoči kapljevini. Matematično fizikalni model je bil vključen v programski paket CFX 5.6, rezultati pa primerjani z rezultati preizkusa, izvedenega v kavitacijskem tunelu.In this paper we present an analysis of the cavitation flow conditions around a NACA hydrofoil. The mathematical model, in the form of Navier Stokes equations, based on the additional transport equation for vapour mass fraction inception, propagation and condensation is presented for the mixture\u27s (water - water vapour) properties. A simplified Rayleigh-Plesset equation is used when the phase change is modelled, where the parameters that influence the flow dynamics near the individual spherical bubble, surrounded by the liquid, are considered. Mathematical/physical model is included in the CFD code CFX 5.6. Simulation results are compared with experimental results from the cavitation tunnel, where the tested hydrofoil (blade) was placed