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Effect of transients on Francis turbine runner life: a review
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
Indian Institute of Technology, Roorkee.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-7599-0895
2013 (English)In: Journal of Hydraulic Research, ISSN 0022-1686, E-ISSN 1814-2079, Vol. 51, no 2, p. 121-132Article in journal (Refereed) Published
Abstract [en]

The present electricity market and the injection of power generated using intermittent energy sources have brought instability in the operation of the power grid. This has resulted in frequent load variations, emergency shut-down and restart, total load rejections, and off-design operation of grid connected hydraulic turbines. The present paper reviews the available literature summarizing the effects of transients on Francis turbine investigated experimentally, numerically, and analytically. Transients create both steady and unsteady pressure loading on the runner blade, resulting in cyclic stresses and fatigue development in the runner. These effects shorten the runner life, increase cost of plant operation, and loss of power generation. The reviewed literature has shown that one start–stop cycle can shorten predefined refurbishment time up to 15 hours. Turbine start–stop cannot be avoided, but runner life may be improved by minimizing the unfavourable pressure loading on the blades during transients through strategic movement of guide vanes.

Place, publisher, year, edition, pages
2013. Vol. 51, no 2, p. 121-132
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-5029DOI: 10.1080/00221686.2012.732971ISI: 000317911300002Scopus ID: 2-s2.0-84877658183Local ID: 30ce143b-1083-478e-8fcd-29883d804742OAI: oai:DiVA.org:ltu-5029DiVA, id: diva2:977903
Note
Validerad; 2013; 20130307 (cervante)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Trivedi, ChiragkumarCervantes, Michel

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