SPECIFIC SPEED EFFECT ON FRANCIS RUNNER RELIABILITY UNDER VARIOUS OPERATING CONDITIONS
DOI:
https://doi.org/10.26512/ripe.v2i4.21455Keywords:
Francis. Runner. Reliability.Abstract
Energy market deregulation and arrival of new players, such as solar and wind turbines, led to an increasing demand for flexible operation of hydraulic urbines. Instead of continuous close to peak operation, it is nowadays not uncommon to see turbines being operated over the whole range, with many start/stops, extensive low load operation, synchronous condenser mode and power/frequency regulation. This new way to operate the units, however, does not come without cost on the machine life expectancy due to the increased number of high and low amplitude cycles introduced in the operation of the unit. To assess machine reliability, it therefore be-comes critical for the owner to understand the real effects of these dynamic phenomena. The purpose of this paper is to show how dynamic phenomena occurring at various operating conditions may affect the lifetime expectancy of different specific speed Francis runners. Runner blade strain gage and pressure site measurements, performed at various locations, and correlated to Computational Fluid Dynamics (CFD) results and structural Finite Element Analysis (FEA) using Fluid Structure Interaction (FSI) techniques, are used to discuss these dynamic phenomena.
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Sick M., Oram C., Braun O., Nennemann B., Coutu A., “HPP delivering regulating power: Technical challenges and cost of operation”, Hydro 2013, Innsbruck, Austria, October 2013
Coutu A., Chamberland-Lauzon J., “The impact of flexible operation on Francis runners”, The International Journal on Hydropower & Dams, Volume Twenty Two, Issue 2, 2015.
Marier S., Marmont H., Théroux E., “Wide Operating Range Design Applied to Hoover Dam Hydroelectric Plant Units A1, N5, N6 & N8 Overhaul”, Hydrovision 2013, Denver CO, July 23-26, 2013
Coutu A., Marier S., Chamberland-Lauzon J., Monette C., “Designing Francis runners for 0-100% operation”, Hydro 2015, 26-28 October 2015, Bordeaux, France.
Nennemann B., Morissette J.-F., Chamberland-Lauzon J., Monette C., Braun O., Melot M., Coutu A., Nicolle J., Giroux A.-M., “Challenges in Dynamic Pressure and Stress Predictions at No-Load Operation in Hydraulic Turbines”, IAHR 27th Symposium on Hydraulic Machinery and Systems, Montreal, Canada, September 2014.
Coutu A., “Mechanical Issues Related to Wide Operating Range”, CEATI Hydropower Workshop, Mitigating Impacts of Aging Infrastructure, March 12-13, 2013, Las Vegas, NV.
Gagnon M., Tahan S.A., Bocher P., Thibault D., “Impact of startup scheme on Francis runner life expectancy”, IOP Conf. Series: Earth and Environmental Science, Vol. 12, 012107, 2010
Melot M., Monette C., Coutu A., Nennemann B., “A new Francis runner design procedure to predict static stresses at speed-no-load operation”, The International Journal on Hydropower & Dams, Volume Twenty One, Issue 1, 2014
Nennemann B., Braun O., “The role of unsteady flow simulation in Francis turbine development”, Hydro 2015, 26-28 October 2015, Bordeaux, France.
Lowys P.-Y. et al, “Alqueva II and Salamonde II : a new approach for extending turbine operation range”, Hydro 2014, 13-15 October 2014, Cernobbio, Italy.
Coutu A., Gagnon M., Monette C., “Life Assessment of Francis Runners Using Strain Gage Site Measurements”, Waterpower XV, Chattanooga, TN, July 23-26, 2007
Nennemann B., Vu T.C., Farhat M., “CFD prediction of unsteady wicket gate-runner interaction in Francis turbines : A new standard hydraulic design procedure”, Hydro 2005, Villach, Austria, October 2005.
Coutu A., Roy M. D., Monette C., Nennemann B., “Experience with Rotor-Stator Interactions in High Head Francis Runner”, IAHR 24th Symposium on Hydraulic Machinery and Systems, Foz do Iguassu, Brazil, 2008.
Nicolle, J., Giroux A.-M., Morissette J.-F., “CFD configurations for hydraulic turbine startup”, IAHR 27th Symposium on Hydraulic Machinery and Systems, Montreal, Canada, September 2014.
Gummer J.H., Etter S., “Cracking of Francis runners during transient operation”, Hydropower & Dams, Issue 4, 2008.
IEC 60193 (1999-2011), Hydraulic turbines, storage pumps and pump-turbines ”“ Model acceptance tests (2nd edition)
Dörfler P., Sick M., Coutu A., “Flow-Induced Pulsation and Vibration in Hydroelectric Machinery, Engineer’s Guidebook for Planning Design and Troubleshooting”, Springler-Verlag, London 2013, ISBN 978-1-4471-4251-5
Huang X., Chamberland-Lauzon J., Oram C., Klopfer A., Ruchonnet N., “Fatigue analyses of the prototype Francis runners based on site measurements and simulations”, 27th IAHR Symposium on Hydraulic Machinery and Systems, Montreal, Canada, 23-25 September 2014
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