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Pressure measurements in the spiral casing of a Kaplan turbine model
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
2010 (English)In: 13th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery 2010 (ISROMAC-13): Honolulu, Hawaii, USA, 4 - 7 April 2010, Red Hook, NY: Curran Associates, Inc., 2010, p. 79-84Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents an investigation of time-dependent pressure measurements in the spiral casing of a Kaplan turbine model. The work is part of a project with the purpose of investigating unsteady flow phenomena in hydro-power turbines. Three different loads were investigated: part load, best efficiency point, and high load. Several locations on the spiral casing were investigated. The results are compared with measurements in the draft tube cone. The mean values of the pressure around the spiral casing outlet indicates a nearly uniform distribution of the pressure to the runner. The runner frequency is one of the dominating frequencies. The corresponding amplitude is similar for all loads and decreases on the outer part of the spiral casing. At part load, a rotating vortex rope with precessional movement occurs in the draft tube. The rope generates an acoustic propagation upstream of the runner, which amplitude is ∼1/5 of the amplitude in the draft tube.

Place, publisher, year, edition, pages
Red Hook, NY: Curran Associates, Inc., 2010. p. 79-84
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-27574Local ID: 112c6ee0-4c55-11df-a0f4-000ea68e967bISBN: 9781617388484 (print)OAI: oai:DiVA.org:ltu-27574DiVA, id: diva2:1000758
Conference
International Symposium on Transport Phenomena and Dynamics of Rotating Machinery : 03/04/2010 - 07/04/2010
Note
Godkänd; 2010; 20100420 (ponjon)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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CiteExportLink to record
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