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Title: Transient Pressure Measurements in the Vaneless Space of a Francis Turbine during Load Acceptances from Minimum Load
Authors: Goyal R.
Gandhi, Bhupendra K.
Cervantes M.J.
Published in: Journal of Physics: Conference Series
Abstract: 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. © Published under licence by IOP Publishing Ltd.
Citation: Journal of Physics: Conference Series, (2018)
Issue Date: 2018
Publisher: Institute of Physics Publishing
Keywords: Francis turbine
pressure fluctuations
rotor-stator interaction
vaneless space
ISSN: 17426588
Author Scopus IDs: 57191617201
Author Affiliations: Goyal, R., Indian Institute of Technology Roorkee, Roorkee, 247667, India, Department of Eng. Sci. and Math, Lulea University of Technology, Lulea, 97187, Sweden
Gandhi, B.K., Indian Institute of Technology Roorkee, Roorkee, 247667, India
Cervantes, M.J., Department of Eng. Sci. and Math, Lulea University of Technology, Lulea, 97187, Sweden
Funding Details: Rahul Goyal and Prof. Michel Cervantes are grateful to the Swedish water power center (SVC) for the financial support. The authors would like to thank the Norwegian Hydropower Centre (NVKS) for the financial support. The measurements have been carried out in collaboration between LTU, Sweden (NTNU, Norway) and IIT Roorkee. The author’s gratitude also goes to the staff of water power laboratory, NTNU, Norway.
Corresponding Author: Goyal, R.; Indian Institute of Technology RoorkeeIndia; email:
Appears in Collections:Conference Publications [ME]

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