Abstract
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.
| Original language | English |
|---|---|
| Article number | 012030 |
| Journal | Journal of Physics: Conference Series |
| Volume | 813 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2017 Apr 4 |
| Externally published | Yes |
| Event | HYdropower Plants PERformance and FlexiBle Operation Towards Lean Integration of New Renewable Energies Symposium, HYPERBOLE 2017 - Porto, Portugal Duration: 2017 Feb 2 → 2017 Feb 3 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Transposition of Francis turbine cavitation compliance at partial load to different operating conditions. / Gomes, J.; Favrel, Arthur Tristan; Landry, C.; Nicolet, C.; Avellan, F.
In: Journal of Physics: Conference Series, Vol. 813, No. 1, 012030, 04.04.2017.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - Transposition of Francis turbine cavitation compliance at partial load to different operating conditions
AU - Gomes, J.
AU - Favrel, Arthur Tristan
AU - Landry, C.
AU - Nicolet, C.
AU - Avellan, F.
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.
UR - http://www.scopus.com/inward/record.url?scp=85017449199&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85017449199&partnerID=8YFLogxK
U2 - 10.1088/1742-6596/813/1/012030
DO - 10.1088/1742-6596/813/1/012030
M3 - Conference article
AN - SCOPUS:85017449199
VL - 813
JO - Journal of Physics: Conference Series
JF - Journal of Physics: Conference Series
SN - 1742-6588
IS - 1
M1 - 012030
ER -