Optimization's potentials for oil guide plate of guide bearing in a hydro-generator

Nan Jia Eisenberger

Optimization's potentials for oil guide plate of guide bearing in a hydro-generator

Titel in Übersetzung: Optimierungspotentiale für die Förderscheibe im Führungslager eines Hydro-Generators

Nan Jia Eisenberger

Lehrstuhl für Geoenergy Production Engineering (550)

Publikation: Thesis / Studienabschlussarbeiten und Habilitationsschriften › Masterarbeit

777 Downloads (Pure)

Abstract

Im Rahmen dieser Diplomarbeit, welche für die Firma Andritz-Hydro GmbH durchgeführt wurde, wurden Verbesserungspotentiale hinsichtlich der Reibungsverluste für ein Scheibenförderungskonzept in Führungslagern von Hydro-Generatoren untersucht. Mit Hilfe von numerischen Strömungssimulationen wurde die stationäre, isotherme und inkompressible Strömung zwischen einem rotierenden Mantel- bzw. Scheibenabschnitt und einer gegenüberliegenden stationären Wände für den Hydro-Generator 'Glendoe' berechnet,ein Teil eines Wasserkraftwerks in Schottland ist. Diese Berechnungen wurden mit dem frei zugänglichen CFD-Softewarepaket OpenFOAM (Open Field Operation and Manipulation) durchgeführt. Durch Variationen von geometrischen Parametern, wie zum Beispiel der Spaltweite zwischen Spurkopfring und Förderscheibe, wurde versucht den Volumenstrom durch den Spalt zu maximieren bei gleichzeitiger Reduktion der Reibungsverluste. Mit Hilfe von so genannten dimensionslosen Kennzahlen (z.B.: Reibbeiwert) kann der Einfluss gewisser Parameter dargestellt werden. Die Ergebnisse der numerischen Strömungsberechnungen wurden mit analytischen Lösungen aus der Fachliteratur für vereinfachte Geometrien (geschlossene rotierende Scheiben mit verschiedenen Spaltweiten zwischen Scheibe und Gehäuse) verglichen. In weiterer Folge wurde versucht einen Gesamteinflussfaktor für die wichtigsten Einflussfaktoren zu ermitteln, mit dessen Hilfe es möglich ist, eine schnelle Vorhersage der wichtigsten Kenngrößen, wie zum Beispiel Reibungsverluste, Volumenstrom und Drücke, für das Scheibenförderungskonzept zu treffen.

Titel in Übersetzung	Optimierungspotentiale für die Förderscheibe im Führungslager eines Hydro-Generators
Originalsprache	Englisch
Qualifikation	Dipl.-Ing.
Gradverleihende Hochschule	Montanuniversität
Betreuer/-in / Berater/-in	Brandstätter, Wilhelm, Betreuer (intern)
Datum der Bewilligung	17 Dez. 2010
Publikationsstatus	Veröffentlicht - 2010

Bibliographische Notiz

gesperrt bis null

Schlagwörter

Hydro-generator Numerische Strömungssimulation OpenFOAM Geometrische Parameter Spurkopfring Förderscheibe Volumenstrom Statische Druckdifferenz Total Druckdifferenz Reibungsverlust Reibbeiwert Empirische Formeln
hydro-generator numerical flow simulation OpenFOAM geometric parameters rotor guide plate volume flow rate static pressure differenc total pressure difference friction loss friction loss coefficient empirical formula

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abstract = "In this diploma thesis, which was carried out for the company Andritz Hydro GmbH, the optimization potentials with regard to friction losses for a guide plate conveying concept of guide bearings in hydro-generators were investigated. With the help of numerical flow simulations the steady, isothermal and incompressible flow in the gap between the rotating runner and the guide plate in the oil container for hydro-generator Glendoe was calculated, which is a part of a hydroelectric plant located in Scotland. These calculations were performed with the free, open source CFD software package OpenFOAM (Open Field Operation and Manipulation). By variation of geometric parameters, such as the gap width between the rotor and the guide plate, an attempt to maximize the flow rate through the gap while reducing the correlated friction losses was made. With the help of so-called dimensionless numbers (e.g. friction loss coefficient), the influence of certain parameters are presented. The results of these numerical flow calculations were compared with analytical solutions found in the literature for simplified geometries (enclosed rotating discs with different gap widths between the disc and casing). Subsequently, attempts to find a general factor for the key factors have been made, by which it is possible to quickly predict the most important parameters, such as friction losses, flow rate and pressure, for the guide plate conveying concept.",

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