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Experimental Investigation of Hydrodynamic Effects on a Vibrating Kaplan Runner
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

An experimental investigation of a vibrating Kaplan turbine runner was performed in order to understand the hydrodynamic effects and to obtain or confirm the mass and damping coefficients used for dimensioning at the design stage. Improved design can lead to increased efficiency and lifetime of hydropower stations. The method was based on the 90◦ phase shift between acceleration and velocity and their relationship with mass and damping respectively. The experiment examined frequencies between 1–9 Hz at displacements between 0.25–2.00 mm. Results showed a frequency dependent added mass which varied between 1.2 and 1.5 (neglecting the highest and lowest frequencies) and an added damping between 0.8 and 1.2 which became of importance at low frequencies. A mathematical interpretation of the fluid solid interactions (based on the constitutive equation for stresses in a Newtonian fluid) has been derived and connected to the obtained experimental data.

Place, publisher, year, edition, pages
2017. , p. 58
Keyword [en]
FSI, fluid-solid interactions, Kaplan runner, hydrodynamic, added mass, added damping, vibrations
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-62149OAI: oai:DiVA.org:ltu-62149DiVA, id: diva2:1076810
External cooperation
Vattenfall AB
Educational program
Engineering Physics and Electrical Engineering, master's level
Supervisors
Examiners
Available from: 2017-03-09 Created: 2017-02-24 Last updated: 2017-09-11Bibliographically approved

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CiteExportLink to record
Permanent link

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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
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  • rtf