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Numerical Simulation and Validation of a High Head Model Francis Turbine at Part Load Operating Condition
Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee.
Norwegian University of Science and Technology, Trondheim, .
Indian Institute of Technology Roorkee.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
2017 (English)In: Journal of The Institution of Engineers (India): Series C, ISSN 2250-0545Article in journal (Refereed) Epub ahead of print
Abstract [en]

Hydraulic turbines are operated over an extended operating range to meet the real time electricity demand. Turbines operated at part load have flow parameters not matching the designed ones. This results in unstable flow conditions in the runner and draft tube developing low frequency and high amplitude pressure pulsations. The unsteady pressure pulsations affect the dynamic stability of the turbine and cause additional fatigue. The work presented in this paper discusses the flow field investigation of a high head model Francis turbine at part load: 50% of the rated load. Numerical simulation of the complete turbine has been performed. Unsteady pressure pulsations in the vaneless space, runner, and draft tube are investigated and validated with available experimental data. Detailed analysis of the rotor stator interaction and draft tube flow field are performed and discussed. The analysis shows the presence of a rotating vortex rope in the draft tube at the frequency of 0.3 times of the runner rotational frequency. The frequency of the vortex rope precession, which causes severe fluctuations and vibrations in the draft tube, is predicted within 3.9% of the experimental measured value. The vortex rope results pressure pulsations propagating in the system whose frequency is also perceive in the runner and upstream the runner.

Place, publisher, year, edition, pages
Springer, 2017.
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-64833DOI: 10.1007/s40032-017-0380-zOAI: oai:DiVA.org:ltu-64833DiVA: diva2:1120835
Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-07-07

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