0
Flows in Complex Systems

Discharge Imbalance Mitigation in Francis Turbine Draft-Tube Bays

[+] Author and Article Information
S. Tridon1

ALSTOM Hydro France, Etablissement de Grenoble, 82 av. Léon Blum, BP75, 38041 Grenoble Cedex 9, Francesylvain.tridon@power.alstom.com

S. Barre

LEGI, Grenoble-INP,CNRS, 1025 rue de la Piscine, 38041 Grenoble, France

G. Ciocan, C. Ségoufin, P. Leroy

ALSTOM Hydro France, Etablissement de Grenoble, 82 av. Léon Blum, BP75, 38041 Grenoble Cedex 9, France

1

Corresponding author.

J. Fluids Eng 134(4), 041102 (Apr 12, 2012) (8 pages) doi:10.1115/1.4006064 History: Received June 14, 2011; Revised February 02, 2012; Published April 12, 2012; Online April 12, 2012

Rehabilitation of ageing power plant is a growing market with specific needs: we have to deal with non up-to-date elements in terms of hydraulic behavior. Refurbishment projects are often focused on the guide vane and runner modification. But for low-head refurbishment projects, the draft-tube is a non negligible part of the overall performance. In some cases, pathological draft-tubes have been encountered with a significant efficiency drop near the best efficiency point. Modification of the draft-tube in order to attenuate, and even eliminate, this effect can thus have a real impact on improving the performance of the power plant, and therefore become economically justified (that heavily depends on the addition or removal of material from the draft-tube walls). Laser Doppler Velocimetry (LDV) measurements near draft-tube outlet have been achieved for both original and modified draft-tube. It offers 2D velocity profiles and permits to calculate discharge repartition in each bay. Pressure recovery factor measured separately for each bay is used to quantify losses.

FIGURES IN THIS ARTICLE
<>
Copyright © 2012 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Geometry of the studied draft-tube

Grahic Jump Location
Figure 2

Global machine efficiency (a) and draft-tube pressure recovery coefficient (b)

Grahic Jump Location
Figure 3

Draft-tube pressure recovery coefficient evolution for the original and modified configurations

Grahic Jump Location
Figure 4

View of the LDV optical arrangement

Grahic Jump Location
Figure 5

Horizontal velocity repartition in each draft-tube bays for original configuration—OP0 to OP5

Grahic Jump Location
Figure 6

Horizontal velocity repartition in each draft-tube bays for modified configuration—OP0 to OP5

Grahic Jump Location
Figure 7

Discharge repartition in draft-tube bays for original configuration (in percent)

Grahic Jump Location
Figure 8

Discharge repartition in draft-tube bays for modified configuration (in percent)

Grahic Jump Location
Figure 9

Head losses coefficient evolution for global and separated evaluation

Grahic Jump Location
Figure 10

Head losses coefficient evolution for original configuration and modified configuration

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In