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Transient pressure measurements on a high head model Francis turbine during emergency shutdown, total load rejection, and runaway
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.ORCID iD: 0000-0001-7599-0895
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee.
Norwegian University of Science and Technology (NTNU), Trondheim.
2014 (English)In: Journal of Fluids Engineering - Trancactions of The ASME, ISSN 0098-2202, E-ISSN 1528-901X, Vol. 136, no 12, article id 121107-1Article in journal (Refereed) Published
Abstract [en]

The penetration of intermittent wind and solar power to the grid network above manageable limits disrupts electrical power grids. Consequently, hydraulic turbines synchronized to the grid experience total load rejection and are forced to shut down immediately. The turbine runner accelerates to runaway speeds in a few seconds, inducing high-amplitude, unsteady pressure loading on the blades. This sometimes results in a failure of the turbine components. Moreover, the unsteady pressure loading significantly affects the operating life of the turbine runner. Transient measurements were carried out on a scale model of a Francis turbine prototype (specific speed = 0.27) during an emergency shutdown with a transition into total load rejection. A detailed analysis of variables such as the head, discharge, pressure at different locations including the runner blades, shafttorque, and the guide vane angular movements are performed. The maximum amplitudes of the unsteady pressure fluctuations in the turbine were observed under a runaway condition. The amplitudes were 2.1 and 2.6 times that of the pressure loading at the best efficiency point in the vaneless space and runner, respectively. Such high-amplitude, unsteady pressure pulsations can affectthe operating life of the turbine.

Place, publisher, year, edition, pages
2014. Vol. 136, no 12, article id 121107-1
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-9133DOI: 10.1115/1.4027794ISI: 000344731800007Scopus ID: 2-s2.0-84907612300Local ID: 7b33e2ae-abf8-4f0e-bd83-8011e4684edfOAI: oai:DiVA.org:ltu-9133DiVA, id: diva2:982071
Note
Validerad; 2014; 20140618 (cervante)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Trivedi, ChiragCervantes, Michel

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