552 KB0 KB199920252000Höfler, Edvardletnik:18številka:29str. 39-51ISSN:1581-0267COBISSID_HOST:1842529URN:URN:NBN:SI:doc-1JU0MFBEenslFakulteta za gradbeništvo in geodezijoActa hydrotechnicacevne vodne turbineconstructionflow conditionsgonilnikiguide apparatuskonstrukcijarunnertokovne razmerevertical tubular hydro turbinevertikalne cevne vodne turbinevodilnikiTurbina tipa Saxo - kombinacija cevne in Kaplanove turbine| Saxo type turbine - combination of tubular and Kaplan turbine|During the last decade in Canada, a turbine of the Saxo type has become a well-recognised product of Litostroj. Saxo is a vertical axial turbine whose construction between the turbine inflow and the runner is similar to tubular turbines with an inlet elbow and semi-axial i.e., conical guide apparatus. Between the runner inlet and the turbine outflow it is similar to conventional Kaplan turbines. This turbine is suitable for covering both operating ranges of Kaplan and tubular turbines. In this paper we describe theadvantages of the design and the hydrodynamic characteristics of the Saxo-turbine. The resultsof the theoretical and numerical investigations of the flow field in the distributor and runner regions are presented. The advantage of the semi-axial distributor is its capability for generating a slightly forced vortex flow, due to which the velocity distribution ahead of the runner blading becomes more uniform. Numerical analysis helped us in identifying the regions of unsatisfactory flow conditions that might be potential sources of power losses and cavitationS turbino tipa Saxo se je Litostroj v zadnjih letih uveljavil v Kanadi. To je vertikalna aksialna turbina, ki je od vstopa do gonilnika podobna cevni turbini z vstopnim kolenom in polaksialnim vodilnikom, od vključno gonilnika do konca sesalne cevi pa podobna običajni kaplanovi turbini. Ta tip turbine lahko pokriva področje uporabe cevnih in kaplanovih turbin. V prispevku so razložene konstrukcijske in hidrodinamične značilnostiturbine Saxo, zaradi katerih je posebej zanimiva in obetavna. Predstavljeni so rezultati teoretično-računskih raziskav toka skozi vodilnik in gonilnik turbine. Prednost koničnega vodilnika je v tem, da generira zmerno vsiljen vrtinec, zaradi katerega je porazdelitev hitrosti pred lopatami gonilnika bolj enakomerna. Računske analize so pokazale, kje so tista kritična mesta, ki zadevajo tokovne razmere, izvore prekomernih izgub in kavitacije. Vse te obetavne napovedi bi bilo treba potrditi s preskusom na modelu turbineTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za gradbeništvo in geodezijo