magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Žiga Rosec (Author), Marko Hočevar (Mentor), Martin Petkovšek (Co-mentor)

Abstract

Da odgovorimo na potrebo po novi turbini nižjih specifičnih hitrosti, ki bo ohranjala prednosti Saxo turbin, smo izdelali novo enojno regulirano vertikalno cevno turbino, ki z diagonalnim gonilnikom omogoča nižjo specifično hitrost. Zaradi stroškov in časa potrebnega za izvajanje eksperimentalnega preizkušanja vodnih turbin, smo izvedli numerične simulacije za vrednotenje delovanja nove turbine. Na podlagi računalniške dinamike tekočin, so bile izvedene simulacije za različne obratovalne točke nove turbine. Pri izvajanju simulacij smo upoštevali predpostavke za nestisljiv enofazni tok. Predstavljene in razložene so uporabljene vodilne enačbe, z izbranim turbulentnim modelom SST. Iz simuliranih obratovalnih točk, je bil modeliran školjčni diagram, ki ima v primerjavi s Saxo turbino zaradi enojne regulacije manjše delovno območje optimalnega izkoristka. Nova konfiguracija doseže cilj nižjih specifičnih hitrosti, na področju med Francisovimi in diagonalnimi tipi turbin. S podrobnejšo analizo treh obratovalnih točk, smo predstavili kavitacijske, in tokovne razmere po turbini. Na področju delnih obremenitev, pride do pojava medlopatične vrtinčne kavitacije in opletajočega kavitacijskega vrtinca v sesalni cevi. Opazovani pojavi so primerljivi s tistimi v Francisovih turbinah.

Keywords

magistrske naloge;vodne turbine;računalniška dinamika tekočin;Navier-Stokes enačbe;turbulentni model SST;školjčni diagram;specifična hitrost;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [Ž. Rosec]
UDC: 621.224:532.5:004.942(043.2)
COBISS: 16927259 Link will open in a new window
Views: 1386
Downloads: 284
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Other data

Secondary language: English
Secondary title: Modelling of pipe turbine with a diagonal runner using computer fluid dynamics
Secondary abstract: To answer the need for a new water turbine, with lower specific speeds, that would maintain all of the advantages of Saxo turbines. We designed a new single regulated vertical tubular turbine, with a diagonal runner, that enables lower specific speeds. Rather than performing expensive and time consuming experimental tests for water turbines, we used numerical simulations for evaluation of working parameters for the new turbine. Computational fluid dynamics were used to simulate different operating points. With the simulations, we have assumed incompressible single-phase flow. We presented and explained all the used leading equations, with the SST turbulence model. From the simulated operating points, we modelled the hill diagram for the new turbine, which has a smaller area of optimal performance compared to Saxo turbines. The new configuration acquires lower specific speeds between Francis and diagonal type turbines. With a more extensive analyzation, we observed three separate operating points and present cavitation and flow conditions in the turbine. In part load operation, we observed the emergence of inter-blade cavitating vortices and vortex rope in draft tube. The observed conditions are similar to those in Francis type turbines.
Secondary keywords: water turbines;computational fluid dynamics;Navier-Stokes equations;turbulent model SST;hill chart;specific speed;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XXII, 72 str.
ID: 11217220