TY - JOUR
T1 - Transposition of Francis turbine cavitation compliance at partial load to different operating conditions
AU - Gomes, J.
AU - Favrel, A.
AU - Landry, C.
AU - Nicolet, C.
AU - Avellan, F.
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2017/4/4
Y1 - 2017/4/4
N2 - Francis turbines operating in part load conditions experience a swirling flow at the runner outlet leading to the development of a precessing cavitation vortex rope in the draft tube. This cavitation vortex rope changes drastically the velocity of pressure waves traveling in the draft tube and may lead to resonance conditions in the hydraulic circuit. The wave speed being strongly related to the cavitation compliance, this research work presents a simple model to explain how it is affected by variations of operating conditions and proposes a method to transpose its values. Even though the focus of this paper is on transpositions within the same turbine scale, the methodology is also expected to be tested for the model to prototype transposition in the future. Comparisons between measurements and calculations are in good agreement.
AB - Francis turbines operating in part load conditions experience a swirling flow at the runner outlet leading to the development of a precessing cavitation vortex rope in the draft tube. This cavitation vortex rope changes drastically the velocity of pressure waves traveling in the draft tube and may lead to resonance conditions in the hydraulic circuit. The wave speed being strongly related to the cavitation compliance, this research work presents a simple model to explain how it is affected by variations of operating conditions and proposes a method to transpose its values. Even though the focus of this paper is on transpositions within the same turbine scale, the methodology is also expected to be tested for the model to prototype transposition in the future. Comparisons between measurements and calculations are in good agreement.
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U2 - 10.1088/1742-6596/813/1/012030
DO - 10.1088/1742-6596/813/1/012030
M3 - Conference article
AN - SCOPUS:85017449199
SN - 1742-6588
VL - 813
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
IS - 1
M1 - 012030
T2 - HYdropower Plants PERformance and FlexiBle Operation Towards Lean Integration of New Renewable Energies Symposium, HYPERBOLE 2017
Y2 - 2 February 2017 through 3 February 2017
ER -