Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Experimental Investigation of Added Mass and Damping on a Model Kaplan Turbine for Rotor Dynamic Analysis
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2018 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The concept of added hydrodynamic properties such as added mass is of importance in modern hydropower development, mainly for rotor dynamic calculations. Added mass could result in reduced natural frequencies and altered mode compared to existing simulation models. It is of importance to quantify added mass but also added damping to make the simulation models more accurate.

Experiments are conducted on a model Kaplan turbine, D = 0,5 m, and a steel cube, S = 0,2 m, for linear vibrations in still water confined in a cylindrical tank. The experiments are conducted in air and water for evaluation of added forces. The vibrations are generated with an electrodynamic vibration exciter with a frequency range of approximately 1-10 Hz with amplitudes 0,5-3 mm.

The experiments were repeated to check test rig reliability. Each individual working point [frequency, amplitude] were in total tested 40 times in 15 s intervals. The added mass was found to be function of acceleration for the model Kaplan with an increase in added mass from 10 % at 4 m/s2 to 35 % at 0,5 m/s2. The damping forces was at best measured at ±30 %, making added damping calculations unreliable.

The cube experiments resulted in small differences between water and air. Cube results must be interpreted with caution due to test rig uncertainties. 

Place, publisher, year, edition, pages
2018. , p. 48
Keyword [en]
Added mass, added damping, rotor dynamics, kaplan turbine, vibrations, fluid dynamics
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-67573OAI: oai:DiVA.org:ltu-67573DiVA: diva2:1181530
External cooperation
Vattenfall R&D
Educational program
Sustainable Energy Engineering, master's level
Supervisors
Examiners
Available from: 2018-02-13 Created: 2018-02-08 Last updated: 2018-02-13Bibliographically approved

Open Access in DiVA

fulltext(8314 kB)7 downloads
File information
File name FULLTEXT01.pdfFile size 8314 kBChecksum SHA-512
400e06402960151f6aa6fc21b401ed59ee2cdccf7836f92e26793f35fde955372c1e380ccec21b2991051e7fc3361019bf31510299c60777c83043d2337e98b9
Type fulltextMimetype application/pdf

By organisation
Department of Engineering Sciences and Mathematics
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 7 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 14 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf