Abstract
Resonance in hydraulic systems is characterized by pressure fluctuations of high amplitude which can lead to undesirable and dangerous effects, such as noise, vibration and structural failure. For a Francis turbine operating at partial load, the cavitating vortex rope developing at the outlet of the runner induces pressure fluctuations which can excite the hydraulic system resonance, leading to undesirable large torque and power fluctuations. At resonant operating points, the prediction of amplitude pressure fluctuations by hydro-acoustic models breaks down and gives unreliable results. A more detailed knowledge of the eigenmodes and a better understanding of phenomenon occurring at resonance could allow improving the hydro-acoustic models prediction.This paper presents an experimental identification of a resonance observed in a close-looped hydraulic system with a Francis turbine reduced scale model operating at partial load. The resonance is excited matching one of the test rig eigenfrequencies with the vortex rope precession frequency. At this point, the hydro-acoustic response of the test rig is studied more precisely and used finally to reproduce the shape of the excited eigenmode.
| Original language | English |
|---|---|
| Article number | 062064 |
| Journal | IOP Conference Series: Earth and Environmental Science |
| Volume | 15 |
| Issue number | PART 6 |
| DOIs | |
| Publication status | Published - 2012 Dec 1 |
| Externally published | Yes |
| Event | 26th IAHR Symposium on Hydraulic Machinery and Systems - Beijing, China Duration: 2012 Aug 19 → 2012 Aug 23 |
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ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Environmental Science(all)
Cite this
Experimental identification and study of hydraulic resonance test rig with Francis turbine operating at partial load. / Favrel, Arthur Tristan; Landry, C.; Müller, A.; Avellan, F.
In: IOP Conference Series: Earth and Environmental Science, Vol. 15, No. PART 6, 062064, 01.12.2012.Research output: Contribution to journal › Conference article
}
TY - JOUR
T1 - Experimental identification and study of hydraulic resonance test rig with Francis turbine operating at partial load
AU - Favrel, Arthur Tristan
AU - Landry, C.
AU - Müller, A.
AU - Avellan, F.
PY - 2012/12/1
Y1 - 2012/12/1
N2 - Resonance in hydraulic systems is characterized by pressure fluctuations of high amplitude which can lead to undesirable and dangerous effects, such as noise, vibration and structural failure. For a Francis turbine operating at partial load, the cavitating vortex rope developing at the outlet of the runner induces pressure fluctuations which can excite the hydraulic system resonance, leading to undesirable large torque and power fluctuations. At resonant operating points, the prediction of amplitude pressure fluctuations by hydro-acoustic models breaks down and gives unreliable results. A more detailed knowledge of the eigenmodes and a better understanding of phenomenon occurring at resonance could allow improving the hydro-acoustic models prediction.This paper presents an experimental identification of a resonance observed in a close-looped hydraulic system with a Francis turbine reduced scale model operating at partial load. The resonance is excited matching one of the test rig eigenfrequencies with the vortex rope precession frequency. At this point, the hydro-acoustic response of the test rig is studied more precisely and used finally to reproduce the shape of the excited eigenmode.
AB - Resonance in hydraulic systems is characterized by pressure fluctuations of high amplitude which can lead to undesirable and dangerous effects, such as noise, vibration and structural failure. For a Francis turbine operating at partial load, the cavitating vortex rope developing at the outlet of the runner induces pressure fluctuations which can excite the hydraulic system resonance, leading to undesirable large torque and power fluctuations. At resonant operating points, the prediction of amplitude pressure fluctuations by hydro-acoustic models breaks down and gives unreliable results. A more detailed knowledge of the eigenmodes and a better understanding of phenomenon occurring at resonance could allow improving the hydro-acoustic models prediction.This paper presents an experimental identification of a resonance observed in a close-looped hydraulic system with a Francis turbine reduced scale model operating at partial load. The resonance is excited matching one of the test rig eigenfrequencies with the vortex rope precession frequency. At this point, the hydro-acoustic response of the test rig is studied more precisely and used finally to reproduce the shape of the excited eigenmode.
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U2 - 10.1088/1755-1315/15/6/062064
DO - 10.1088/1755-1315/15/6/062064
M3 - Conference article
VL - 15
JO - IOP Conference Series: Earth and Environmental Science
JF - IOP Conference Series: Earth and Environmental Science
SN - 1755-1307
IS - PART 6
M1 - 062064
ER -