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LDA measurements in the Francis-99 draft tube cone
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Norwegian University of Science and Technology (NTNU), Trondheim.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
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2014 (English)In: 27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR:: Montreal, Canada, 22-26 September 2014, IOP Publishing Ltd , 2014, 22012Conference paper (Refereed)
Abstract [en]

Velocity measurements were performed in the draft tube cone of a 1:5.1 scaled model of the Tokke hydropower plant, Norway; also known as the Francis-99 model. Results from the laser Doppler anemometry measurements undertaken at three operating points will be used as validation data for an upcoming workshop on the state of the art of Francis turbine numerical simulation. With the turbine operating at the best efficiency point, a sensitivity analysis of the flow parameters head, flow rate and runner rotational speed shows that the effects on the dimensionless velocity profiles are small as long as nED and QED are held constant. The results indicate a well-functioning turbine at the best efficiency point and high load. At the part load operating point, a vortex breakdown occurs which distorts the velocity profiles and significantly lowers the turbine’s hydraulic efficiency. Frequency spectrums of each LDA signal at part load reveals a peak which is asynchronous to that of the runner angular speed. The peaks might be related to the precession of a rotating vortex rope but the characteristics of the LDA signals are different compared to previous studies involving rotating vortex ropes.

Place, publisher, year, edition, pages
IOP Publishing Ltd , 2014. 22012
Series
, I O P Conference Series: Earth and Environmental Science, ISSN 1755-1307 ; 22
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-38235DOI: 10.1088/1755-1315/22/2/022012Local ID: c8e9aa1e-a01f-426f-ae10-72799f2668fcOAI: oai:DiVA.org:ltu-38235DiVA: diva2:1011734
Conference
IAHR Symposium on Hydraulic Machinery and Systems : 22/09/2014 - 26/09/2014
Note
Validerad; 2015; Nivå 1; 20141002 (sunjoe)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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