Ignacijo Biluš (Author), Leopold Škerget (Author), Andrej Predin (Author), Matjaž Hriberšek (Author)

Abstract

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.

Keywords

analize toka;gibanje tekočin;kavitacija;lopatice turbinske;matematični modeli;simuliranje numerično;tok kavitacijski;tokovne razmere

Data

Language: Slovenian
Year of publishing:
Typology: 1.03 - Short Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: Association of Mechanical Engineers and Technicians of Slovenia et al.
UDC: 621.224:532.528
COBISS: 8153627 Link will open in a new window
ISSN: 0039-2480
Parent publication: Strojniški vestnik
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Other data

Secondary language: English
Secondary title: Experimental and numerical analysis of the cavitational flows around a hydrofoil
Secondary abstract: 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's (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.
Secondary keywords: turbine blades;cavitation flow;water turbine flow analysis;numerical simulations;lopatice turbinske;tok kavitacijski;analize toka;simuliranje numerično;
URN: URN:NBN:SI
Type (COBISS): Not categorized
Pages: str. 103-118
Volume: ǂLetn. ǂ51
Issue: ǂšt. ǂ2
Chronology: 2005
ID: 1743248