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
Preliminary simulation of Porjus U9 turbine at speed no load
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Hydropower plants are shifting towards operating at off-designed conditions, meaning that the number of start-stop cycles and maintenance time due to cavitation increases. The speed no-load condition is the moment before magnetization of the generator, i.e., no load, low flow, constant runner rotational speed, guide vane and runner blade angle. Since no load is applied, the water dissipates its energy in forms of highly recirculating and turbulent flow. This master thesis aim is to simulate the speed no-load condition on the Porjus U9 turbine and validate numerical values against experimental ones. ICEM CFD was used to mesh the domains and ANSYS CFX was used to perform the simulation. The setup was split into two zones, Zone 1 and Zone 2, and an intermediate zone overlapping both zones. Zone 1 consists of the penstock and spiral, the intermediate zone consists of the spiral and distributor passages and Zone 2 consists of a distributor passage, runner and draft tube. Streamlines in the runner and draft tube show highly recirculating flow from the draft tube back into the runner. The numerical values did not correspond well against the experimental. This is deemed most likely due to an overall low pressure over the runner blades. It is recommended as a first step to increase the quality of the runner and distributor mesh to get the simulation running with the cavitation model implemented.

Place, publisher, year, edition, pages
2019. , p. 38
Keywords [en]
Kaplan, Speed no-load, SNL
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-74378OAI: oai:DiVA.org:ltu-74378DiVA, id: diva2:1323063
External cooperation
Vattenfall AB
Subject / course
Student thesis, at least 30 credits
Educational program
Sustainable Energy Engineering, master's level
Presentation
2019-05-24, E231, Luleå tekniska universitet, 97187, Luleå, 15:10 (English)
Supervisors
Examiners
Available from: 2019-06-13 Created: 2019-06-11 Last updated: 2019-06-13Bibliographically approved

Open Access in DiVA

fulltext(3351 kB)36 downloads
File information
File name FULLTEXT03.pdfFile size 3351 kBChecksum SHA-512
726f99ea9dfa8c6762fa6f5aac970e4c90441f9f715af12a8bc2ae5015e6ef73d1fa7755dcca8e62d0ff03d405c819163dd9daf4fa5ba4f7a31ab1b7ab6dff6b
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Holmström, Henrik
By organisation
Department of Engineering Sciences and Mathematics
Energy Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 36 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: 1039 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