Journal
RENEWABLE ENERGY
Volume 166, Issue -, Pages 147-162Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2020.11.108
Keywords
Cavitation; CFD; Energy; Hydropower; Turbine; Variable-speed
Funding
- European Union [764011]
- Notur/Norstore project [nn9504 k]
Ask authors/readers for more resources
Variable-speed operation of a hydro turbine is considered as an alternative option to meet fluctuating energy demand as it allows high-ramping rate. Cavitation can be a limiting factor to utilize the variable speed technology at full potential in a hydro power plant. This work investigates the cavitation characteristics and unsteady pressure fluctuations as turbine ramps up, to meet the energy demand. The investigated Francis turbine consists of 15 blades and 15 splitters, and the reference diameter is 0.349 m. Numerical model of complete turbine is prepared and hexahedral mesh is created. Rayleigh Plesset algorithm is activated for cavitation modelling. Available experimental data of model acceptance test are used to prescribe boundary conditions, and to validate the numerical results at distinct points. Transient behaviour of the cavitation is studied, and the results are quite interesting. At certain time instants, the cavitation effect is extremely predominant, and as a result of cavitation bubble bursts, the amplitudes of pressure fluctuations are significantly high. (C) 2020 The Author(s). Published by Elsevier Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available