20.500.12556/DKUM-53184 Napoved izkoristka francisove turbine z numeričnim izračunom toka Using numerical flow analysis to predict the efficiency of a Francis turbine V prispevku 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. 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. Francis turbine turbine efficiency flow analysis turbulence models true false false Association of Mechanical Engineers and Technicians of Slovenia et al. Slovenski jezik Angleški jezik Delo ni kategorizirano 2015-07-10 19:36:56 2015-07-10 19:36:56 2022-06-02 03:09:23 2019-07-11 08:03:41 2001 0 0 str. 70-82 št. 2 Letn. 47 2001 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.224.24:532.57 762116 4612123 0039-2480 URN:SI:UM:DK:DHWZBZWC http://www.dlib.si/details/URN:NBN:SI:doc-34NPRFRN 1 https://dk.um.si/Dokument.php?lang=slv&id=77744 Fakulteta za strojništvo 0 0 0