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Meritev tlačnih nihanj v kavitacijskem vrtincu modelne Francisove črpalne turbine : magistrsko delo magistrskega študijskega programa II. stopnje StrojništvoKrek, RomanaPri enojno reguliranih Francisovih črpalnih turbinah se izven optimalnega področja obratovanja zaradi sekundarnih tokov na izhodu iz gonilnika ustvari vrtinec. Vrtinec povzroča nizkofrekvenčne tlačne ... pulzacije, te pa vibracije in hrup. Tlačne pulzacije in vrtinec imajo isto lastno frekvenco, ki je običajno med 20 % in 40 % hitrosti vrtenja gonilnika. Pri nezadostni sesalni višini prične vrtinec kavitirati in tako postane viden. Takrat ga imenujemo kavitacijski vrtinec. Za izbrani model Francisove turbine smo eksperimentalno opredelili obratovalne točke, kjer se kavitacijski vrtinec pojavi. Opredelili smo, kako vrtinec izgleda, in pomerili tlačne pulzacije, ki jih povzroči. V nalogi so predstavljene prve meritve absolutnega statičnega tlaka znotraj kavitacijskega vrtinca. Za meritve tlaka v kavitacijskem vrtincu je bil izdelan poseben merilni sistem. Glede na različne izbrane točke obratovanja smo izmerili absolutni statični tlak v kavitacijskem vrtincu, ki je znašal od 90 mbar do 260 mbar. Meritve so bile izvedene po standardu IEC 60193 v laboratoriju za turbinske stroje na merilni postaji za merjenje modelov turbin tipa Francis.Type of material - master's thesis ; adult, seriousPublication and manufacture - Ljubljana : [R. Krek], 2019Language - slovenianCOBISS.SI-ID - 16837915
Author
Krek, Romana
Other authors
Petkovšek, Martin |
Hočevar, Marko, strojnik, 1972-
Topics
magistrske naloge |
Francisove črpalne turbine |
kavitacijski vrtinec |
tlak |
tlačne pulzacije |
meritve |
delna obremenitev |
Francis pumps turbine models |
cavitation vortex rope |
pressure pulsations |
measurements |
part load
Library/institution |
City | Acronym | For loan | Other holdings |
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Faculty of Mechanical Engineering, Ljubljana | Ljubljana | FSLJ |
reading room 1 cop.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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DRS, in which the journal is indexed
Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Krek, Romana | |
Petkovšek, Martin | 35069 |
Hočevar, Marko, strojnik, 1972- | 18836 |
Source: Personal bibliographies
and: SICRIS
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