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Title: Measurements on a model Francis turbine during start-stop
Authors: Goyal R.
Gandhi, Bhupendra K.
Cervantes M.J.
Published in: International Journal of Fluid Machinery and Systems
Abstract: Increased penetration of intermittent energy resources disturbs the power grid network. The frequency band of the power grid is normally controlled by automatic opening and closing of the guide vanes of hydraulic turbines. Tins has increased the number of startup and shutdown cycles as compared to the defined ones for the normal operation of turbines. Turbine startup and shutdown induced a higher level of pressure fluctuations and unsteadiness in the flow field, decreasing its expected life. This paper presents the pressure and velocity measurements performed on a Francis turbine model during startup and shutdown. The pressure measurements were performed in the vaneless space and draft tube and two-dimensional particle image velociinetry measurements m the cone. The turbine operations from a standstill (no flow) and high load were considered to perform the startup and shutdown, respectively. The frequency of rotor-stator interactions and standing waves were well captured in the spectrograms of pressure signals. The signature of rotating vortex rope frequency was also observed in the spectrograms. A huge disturbance in the draft tube flow: was observed due to these transient operations. The flow: at the center was mainly dominated by the stagnant, separation and recirculating regions. © 2019, Turbomachinery Society of Japan. All rights reserved.
Citation: International Journal of Fluid Machinery and Systems (2019), 12(3): 217-227
Issue Date: 2019
Publisher: Turbomachinery Society of Japan
Keywords: Flow dynamics
Francis turbine
Particle image velociinetry
Pressure measurements
Rotor-stator interaction
ISSN: 18829554
Author Scopus IDs: 57191617201
Author Affiliations: Goyal, R., Centre for Energy Studies, Indian Institute of Technology, Delhi, 110016, India
Gandhi, B.K., Mechanical and Industrial Engineering Department, Indian Institute of Technology, Roorkee, 247337, India
Cervantes, M.J., Department of Engineering Science and Mathematics, Luleå University of Technology, Luleå, 97187, Sweden
Funding Details: Rahul Goyal and Prof. Michel Cervantes are grateful to the Swedish water power center (SVC) for financial support. The authors would like to thank the Norwegian Hydropower Centre (NVKS) for 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.; Centre for Energy Studies, Indian Institute of TechnologyIndia; email:
Appears in Collections:Journal Publications [ME]

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