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Dynamic Analysis of a Francis Turbine

Authors: Hanekamhaug, Frank;

Dynamic Analysis of a Francis Turbine

Abstract

Francisturbiner er velkjente installasjoner i norske vannkraftverk. De dynamiske egenskapene til en Francisturbin påvirkes signifikant av miljøet den opererer i, det er derfor et stort ønske å forstå samspillet mellom turbin og vann bedre for å sikre stabil kraftproduksjon. Denne masteroppgaven betrakter en forenklet modell av en Francisturbin, modellen er nedsenket i vann og blir utsatt for en støtkraft. Det ble utført to forskjellige analysemetoder på modellen, begge utført i Abaqus explicit dynamics. En akustisk-struktur koblet analyse og en Euler-Lagrange koblet analyse. Det er lagt vekt på oppsett og resultater fra simuleringene for å finne den best egnede metoden for denne type problemer. Metodene er svært ulike, og det er derfor utfordrende å tilegne identiske forutsetninger i simuleringene. Den akustisk-struktur koblede analysen viste seg som en svært pålitelig metode. Tolkning av energimengdene indikerte en optimal simulering. Et dempingsforhold ble utregnet fra forskyvningens amplituder, og grunnet fravær av viskositet i de akustiske elementene ble dempingforholdet lavt. Den Euler-Lagrange koblete analysen var tvetydig i henhold til pålitelighet. Energimengdene tilstede i simuleringen indikerte en ikke-optimalisert simulering, og nødvendige tiltak er derfor anbefalt. Dempingsforholdet ble utregnet fra forskyvningens amplituder, og det ble funnet et høyere dempingsforhold enn for den akustisk-struktur koblede analysen. Euler-Lagrange metoden ble ansett best egent, selv med indikasjonene på en ikke-optimalisert simulering. Metoden viser seg å være allsidig og har mulighet for å implementeres i mer avanserte problemer.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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