NDLI: Experimental investigation of the draft tube inlet flow of a bulb turbine

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Experimental investigation of the draft tube inlet flow of a bulb turbine

Content Provider	Scilit
Author	Vuillemard, J. Aeschlimann, V. Fraser, R. Lemay, S. Deschênes, C.
Copyright Year	2014
Description	Journal: Iop Conference Series: Earth and Environmental Science In the BulbT project framework, a bulb turbine model was studied with a strongly diverging draft tube. At high discharge, flow separation occurs in the draft tube correlated to significant efficiency and power drops. In this context, a focus was put on the draft tube inlet flow conditions. Actually, a precise inlet flow velocity field is required for comparison and validation purposes with CFD simulation. This paper presents different laser Doppler velocimetry (LDV) measurements at the draft tube inlet and their analysis. The LDV was setup to measure the axial and circumferential velocity on a radius under the runner and a diameter under the hub. A method was developed to perform indirect measurement of the mean radial velocity component. Five operating conditions were studied to correlate the inlet flow to the separation in the draft tube. Mean velocities, fluctuations and frequencies allowed characterizing the flow. Using this experimental database, the flow structure was characterized. Phase averaged velocities based on the runner position allowed detecting the runner blade wakes. The velocity gradients induced by the blade tip vortices were captured. The guide vane wakes was also detected at the draft tube inlet. The recirculation in the hub wake was observed.
Related Links	http://iopscience.iop.org/article/10.1088/1755-1315/22/3/032010/pdf
ISSN	17551307
e-ISSN	17551315
DOI	10.1088/1755-1315/22/3/032010
Journal	Iop Conference Series: Earth and Environmental Science
Issue Number	3
Volume Number	22
Language	English
Publisher	IOP Publishing
Publisher Date	2014-03-01
Access Restriction	Open
Subject Keyword	Journal: Iop Conference Series: Earth and Environmental Science Experimental Investigation
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Physics and Astronomy Environmental Science

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