Pressure measurements and high speed visualizations of the cavitation phenomena at deep part load condition in a Francis turbine

In a hydraulic power plant, it is essential to provide a reliable, sustainable and flexible energy supply. In recent years, in order to cover the variations of the renewable electricity production, hydraulic power plants are demanded to operate with more extended operating range. Under these off-design conditions, a hydraulic turbine is subject to cavitating swirl flow at the runner outlet. It is well-known that the helically/symmetrically shaped cavitation develops at the runner outlet in part load/full load condition, and it gives severe damage to the hydraulic systems under certain conditions. Although there have been many studies about partial and full load conditions, contributions reporting the deep part load condition are limited, and the cavitation behaviour at this condition is not yet understood. This study aims to unveil the cavitation phenomena at deep part load condition by high speed visualizations focusing on the draft tube cone as well as the runner blade channel, and pressure fluctuations associated with the phenomena were also investigated.


Published in:
Proceedings of the 27th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2014), 22, 1-8
Presented at:
27th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2104), Montréal, Québec, Canada, September 22-26, 2014
27th IAHR Symposium on Hydraulic Machinery and Systems, Montréal, Canada, September 22-26, 2014
Year:
2014
Publisher:
Bristol, IOP Publishing Ltd
Laboratories:




 Record created 2015-02-20, last modified 2018-08-14

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