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Transient Pressure Measurements in the Vaneless Space of a Francis Turbine during Load Acceptances from Minimum Load
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. Indian Institute of Technology Roorkee.
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
2018 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 1042, article id 012009Article in journal (Refereed) Published
Abstract [en]

Increased penetration of solar and the wind impels the designers of the hydroelectric power generation unit to provide more flexibility in operation for the stability of the grid. The power generating unit includes turbine which needs to sustain sudden change in its operating conditions. Thus, the hydraulic turbine experiences more transients per day which result in chronic problems such as fatigue to the runner, instrument malfunctioning, vibrations, wear and tear etc. This paper describes experiments performed on a high model (1.5:1) Francis turbine for load acceptances from the minimum load. The experiments presented in the paper are the part of Francis-99 workshop which aims to determine the performance of numerical models in simulations of model Francis turbine under steady and transient operating conditions. The aim of the paper is to present the transient pressure variation in the vaneless space of a Francis turbine where high-frequency pulsations are normally expected. For this, two pressure sensors, VL1 and VL2, are mounted at the vaneless space, one near the beginning of the spiral casing and the other before the end of the spiral casing. Both are used to capture the unsteady pressure field developed in the space between guide vanes and runner inlet. The time-resolved pressure signals are analyzed and presented during the transient to observe the pressure variation and dominant frequencies of pulsations.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2018. Vol. 1042, article id 012009
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-69497DOI: 10.1088/1742-6596/1042/1/012009Scopus ID: 2-s2.0-85049471967OAI: oai:DiVA.org:ltu-69497DiVA, id: diva2:1218164
Conference
Current Research in Hydraulic Turbines (CRHT) VIII,Kathmandu University, Nepal, 20 March 2018
Note

 Konferensartikel i tidskrift;2018-06-14 (andbra)

Available from: 2018-06-14 Created: 2018-06-14 Last updated: 2018-08-09Bibliographically approved

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Cervantes, Michel

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