Reducirani numerički model strujanja kroz cijevnu turbinu

undergraduate thesis

• Title (english): Reducted-order numerical model of flow through bulb turbine
• Author: Leo Pavletić
• Mentor: Željko Tuković (mentor)
• Committee member: Vladimir Soldo (predsjednik povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2021-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U ovom radu su prikazane različite vrste hidrauličkih turbina u postrojenjima za proizvodnju električne energije. Analiziraju se njihove glavne karakteristike da bi se razumijelo u kojem području raspoloživih vodenih padova i protoka se mogu efikasno
koristiti. Također se razmatraju cijevne turbine za postrojenja koja koriste energiju plime i oseke te turbine-pumpe za postrojenja koja skladište energiju.
Prikazano je kako odabrati osnovne veličine cijevne turbine uz pomoć osnovnih projektnih parametara. Proračunavaju se komponente brzina na ulazu u rotor, izlazu iz rotora, izlazu iz statora te kutove relativne brzine β_2 i β_3 . Prikazan je i proračun pada tlaka kroz rotorske lopatice.
Zadatak ovog rada bio je izraditi parametarski geometrijski model protočnog dijela cijevne turbine. Pomoću m4 kompjuterskog jezika prikazana je parametrizacija geometrijskog modela cijevne turbine unutar koje se promjenom vanjskog promjera rotora
mijenja cijeloukupna geometrija cijevne turbine.
Numerički proračuni cijevne turbine izvršeni su u programskom paketu OpenFOAM. Korišten je model nestlačivog stacionarnog turbulentnog strujanja te je turbulencija modelirana pomocu k-ω SST modela turbulencije. U rezultatima simulacije cijevne
turbine prikazano je polje brzine te padovi tlaka kroz turbinu.

Abstract (english)

This thesis presents different types of hydraulic turbines for electric power plants. Their main characteristics are analyzed to understand in which range of head and flow rate they can be used efficiently. Bulb turbines for tidal energy plants and reversible pump-turbines for pumped storage plants are also considered.
The task of this thesis was to show how to choose general dimensions of bulb turbine by knowing basic design parameters. Also, velocity components at the rotor inlet, rotor outlet, stator outlet and relative velocity angles (β_2 and β_3) are calculated. The calculation of the pressure drop through the rotor blades is also shown.
Numerically parameterized model is made using the m4 computer language. The parameterization of the geometric model is shown, within which the overall geometry of the bulb turbine changes by replacing the value of the rotors outer diameter.
The numerical calculations for bulb turbine were made in the OpenFOAM software package. Incompressible steady-state turbulent flow model was used, and turbulence was modeled using a k - ωSST turbulence model. The analysis of the result shows
velocity eld and pressure drop eld trough turbine.

• Keywords: hidrauličke turbine; cijevne turbine; m4 parametrizacija; računalna dinamika fluida
• Keywords (english): hydraulic turbines; bulb turbines; m4 parameterization; computational fluid dynamics
• Language: croatian
• URN:NBN: urn:nbn:hr:235:299126
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-02-26 14:26:51