Skip navigation
Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/11488
Title: Experimental and numerical studies for a high head francis turbine at several operating points
Authors: Trivedi C.
Cervantes M.J.
Gandhi, Bhupendra K.
Dahlhaug O.G.
Published in: Journal of Fluids Engineering, Transactions of the ASME
Abstract: Experimental and numerical studies on a high head model Francis turbine were carried out over the entire range of turbine operation. A complete Hill diagram was constructed and pressure-time measurements were performed at several operating conditions over the entire range of power generation by installing pressure sensors in the rotating and stationary domains of the turbine. Unsteady numerical simulations were performed at five operating conditions using two turbulent models, shear stress transport (SST) k-ω and standard k-ε and two advection schemes, high resolution and second order upwind. There was a very small difference (0.85%) between the experimental and numerical hydraulic efficiencies at the best efficiency point (BEP); the maximum difference (14%) between the experimental and numerical efficiencies was found at lower discharge turbine operation. Investigation of both the numerical and experimental pressure-time signals showed that the complex interaction between the rotor and stator caused an output torque oscillation over a particular power generation range. The pressure oscillations that developed due to guide vanes and runner blades interaction propagate up to the trailing edge of the blades. Fourier analysis of the signals revealed the presence of a vortex rope in the draft tube during turbine operation away from the BEP. © 2013 by ASME.
Citation: Journal of Fluids Engineering, Transactions of the ASME (2013), 135(11): -
URI: https://doi.org/10.1115/1.4024805
http://repository.iitr.ac.in/handle/123456789/11488
Issue Date: 2013
Keywords: Blade loading
Francis turbine
Pressure oscillations
Rotor stator interaction
Steady state
ISSN: 982202
Author Scopus IDs: 55627166200
55328928400
7006087147
23008431600
Author Affiliations: Trivedi, C., Division of Fluid and Experimental Mechanics, Department of Engineering Sciences and Mathematics, Lulea University of Technology, Norrbotten 97187, Sweden, Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India
Cervantes, M.J., Division of Fluid and Experimental Mechanics, Department of Engineering Sciences and Mathematics, Lulea University of Technology, Norrbotten 97187, Sweden
Gandhi, B.K., Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India
Dahlhaug, O.G., Water Power Laboratory, Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
Corresponding Author: Cervantes, M.J.; Division of Fluid and Experimental Mechanics, Department of Engineering Sciences and Mathematics, Lulea University of Technology, Norrbotten 97187, Sweden; email: Michel.Cervantes@ltu.se
Appears in Collections:Journal Publications [ME]

Files in This Item:
There are no files associated with this item.
Show full item record


Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.