Dragica Jošt (Author), Leopold Škerget (Author)

Abstract

ǂV ǂprispevku je predstavljena numerična analiza toka v francisovi turbini. Osredotočili smo se na napoved energijskih izgub v toku in napoved izkoristka turbine. Rezultate, dobljene z ločeno analizo toka v vsakem delu turbine, smo primerjali z rezultati ločenega izračuna toka v spirali in skupnega izračuna toka skozi preostalo turbino. Nato smo izračunali tok v francisovi turbini v večjem številu obratovalnih točk, narisali školjčni diagram izkoristka in ga primerjali z izmerjenim. Enak izračun je bil narejen še za primer, ko nimamo izmerjenih vztopnih podatkov. V prispevku je predstavljen tudi vpliv gostote mreže in izbire turbulentnega modela na rezultate.

Keywords

analize toka;Francisove turbine;izkoristek turbin;modeli;modeli turbulentni;tokovne razmere;turbine;turbine francisove;turbulentni tok

Data

Language: Slovenian
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: Association of Mechanical Engineers and Technicians of Slovenia et al.
UDC: 621.224.24:532.57
COBISS: 4612123 Link will open in a new window
ISSN: 0039-2480
Parent publication: Strojniški vestnik
Views: 272
Downloads: 84
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Using numerical flow analysis to predict the efficiency of a Francis turbine
Secondary abstract: This paper presents a numerical analysis of flow in a Francis turbine. We concentrate on flow -energy losses and efficiency prediction. The results, obtained by a separate analysis of each turbine component, are compared with the results of a separate analysis of flow in a spiral casing end a simultaneous calculation of the flow through the other turbine parts. After this we analysed flow in a Francis turbine at several operating points, an efficiency hill-chart diagram was drawn and compared with the measured one. The some calculation was made for a case where no measured iniet conditions were available. The effect of the grid density and turbulence models on the results is also presented.
Secondary keywords: Francis turbine;turbine efficiency;flow analysis;turbulence models;turbine francisove;izkoristek turbin;analize toka;modeli turbulentni;
URN: URN:NBN:SI
Type (COBISS): Not categorized
Pages: str. 70-82
Volume: ǂLetn. ǂ47
Issue: ǂšt. ǂ2
Chronology: 2001
ID: 1748354