Flow field UVP measurements of a Y-shape outlet structure

• Presented at: 9th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, Strasbourg, August 27-29 2014
• Published in: Proceedings of the 9th International Symposium on Ultrasonic Doppler Methods for Fluid Mechanics and Fluid Engineering, p. 61-64
• Publication date: 2014

Y-shape outlet structures are used to release the turbine water into a reservoir. Classical design oftenuses a Y-shape over a certain length and with a specific opening angle. Depending on the geometry,especially in turbine mode, significant undesired flow separations may occur at the bifurcation.Investigations were performed with physical model tests using ultrasonic profilers at 1 and 2 MHzemission frequencies in order to assess an approach to control the design of an outlet structure bymeasuring the flow field and its fluctuations. The distribution and fluctuation of the flow velocities, bothat the exit section as well as along the tunnel axes for both outlet openings of the Y-shape geometryallow detecting potential flow detachment at the bifurcation.

Keywords: pump-storage scheme ; outlet work ; flow field ; ultrasonic velocity profiler UVP ; physical modelling

Note:

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Reference

• EPFL-CONF-207748
• URL: http://www.isud-conference.org/proc/split/ISUD-09/Pachoud_ISUD-2014.pdf

Record created on 2015-05-06, modified on 2017-01-20