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Transient pressure measurements at part load operating condition of a high head model Francis turbine
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee.
Norvegian University of Science and Technology.
Indian institute of Technology, Roorkee, India.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
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Number of Authors: 5
2016 (English)In: Sadhana (Bangalore), ISSN 0256-2499, E-ISSN 0973-7677, Vol. 41, no 11, 1311-1320 p.Article in journal (Refereed) Published
Abstract [en]

Hydraulic turbines are operating at part load conditions depending on availability of hydraulic energy or to meet the grid requirements. The turbine experiences more fatigue during the part load operating conditions due to flow phenomena such as vortex breakdown in the draft tube and flow instability in the runner. The present paper focuses on the investigation of a high head model Francis turbine operating at 50% load. Pressure measurements have been carried out experimentally on a model Francis turbine. Total six pressure sensors were mounted inside the turbine and other two pressure sensors were mounted at the turbine inlet pipe. It is observed that the turbine experiences significant pressure fluctuations at the vaneless space and the runner. Moreover, a standing wave is observed between the pressure tank outlet and the turbine inlet. Analysis of the data acquired by the pressure sensors mounted in the draft tube showed the presence of vortex breakdown co-rotating with the runner. The detailed analysis showed the rotating and plunging components of the vortex breakdown. The influence of the rotating component was observed in the entire hydraulic circuit including distributor and turbine inlet but not the plunging one

Place, publisher, year, edition, pages
2016. Vol. 41, no 11, 1311-1320 p.
National Category
Applied Mechanics Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-60077DOI: 10.1007/s12046-016-0556-xISI: 000388729700006ScopusID: 2-s2.0-84992108897OAI: oai:DiVA.org:ltu-60077DiVA: diva2:1043909
Note

Validerad; 2016; Nivå 2; 2016-11-21 (andbra)

Available from: 2016-11-01 Created: 2016-11-01 Last updated: 2016-12-22Bibliographically approved

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Publisher's full textScopushttp://www.ias.ac.in/article/fulltext/sadh/041/11/1311-1320

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