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Title:Numerična simulacija kavitacijskega toka skozi divergentno radialno rego
Authors:Mišković, Nikola (Author)
Biluš, Ignacijo (Mentor) More about this mentor... New window
Lešnik, Luka (Co-mentor)
Files:.pdf UN_Miskovic_Nikola_2016.pdf (3,28 MB)
MD5: 00B7ADD6E7CAB5351E112FCA765B7D6E
 
Language:Slovenian
Work type:Undergraduate thesis (m5)
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Abstract:Kavitacija je pojav prehoda kapljevine v parno fazo in nazaj v kapljevino do katerega pride pri nenadnem padcu tlaka. Pozitivne učinke kavitacije s pridom izkoriščajo v medicini med tem ko imajo njeni negativni učinki vpliv na obratovanje turbinskih in drugih strojev. Verjetno najbolj pogost negativen učinek kavitacije je kavitacijska erozija, ki nastane zaradi implozije kavitacijskih mehurčkov v bližini trdne površine. V diplomskem delu smo z uporabo programa računalniške dinamike tekočin ANSYS CFX preučili natančnost treh različnih kavitacijskih modelov. Kavitacijski modeli so bili testirani na primeru toka vode skozi divergentno radialno rego. Rezultati numeričnih simulacij so bili primerjani z rezultati meritev opravljenimi na Univerzi v Grenoblu. Izvedli smo časovno neodvisne simulacije z vsemi tremi kavitacijskimi modeli ter eno časovno odvisno simulacijo z uporabo Zwartovega kavitacijskega modela. Na podlagi dobljenih rezultatov smo zaključili, da vsi uporabljeni kavitacijski modeli pravilno napovejo področje nastanka parne faze.
Keywords:Kavitacija, kavitacijska erozija, numerična simulacija, računalniška dinamika tekočin
Year of publishing:2016
Publisher:[N. Mišković]
Source:Maribor
UDC:004.94:532.528(043.2)
COBISS_ID:20308502 New window
NUK URN:URN:SI:UM:DK:ZZN5FA4Y
Views:966
Downloads:96
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:KTFMB - FS
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Secondary language

Language:English
Title:Numerical simulation of cavitating flow through radial divergent section
Abstract:Cavitation is a phenomenon of liquid transition to the vapor and back to liquid. It occurs at sudden drop in pressure. The positive effects of cavitation are commonly used in medicine while its negative effects impact on the operations of turbine and other machinery. Probable the most common negative effect of cavitation is the cavitation erosion caused by the implosion of vapor bubbles near a solid surface. The thesis discusses about the accuracy of three different mass transfer models for prediction of cavitation which were tested numerically using ANSYS CFX simulation program. They were tested on the model of divergent radial test section. The results of numerical simulations were compared with the results of experimental measurements performed at the University of Grenoble. In the thesis we performed out steady simulations using all three mass transfer models. We also performed out transient simulation using Zwart model. Based on the presented results we concluded that all mass transfer models correctly predict the area of cavitation formation.
Keywords:Cavitation, cavitation erosion, numerical simulation, computational fluid dynamics


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