0
Research Papers: Flows in Complex Systems

One-Dimensional Analysis of Full Load Draft Tube Surge

[+] Author and Article Information
Changkun Chen

Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japanchenchangkun@mbox.me.es.osaka-u.ac.jp

Christophe Nicolet

 Laboratory for Hydraulic Machines (LMH-IMHEF), École Polytechnique Fédérale de Lausanne (EPFL), Avenue de Cour 33bis, CH-1007 Lausanne, Switzerlandchristophe.nicolet@epfl.ch

Koichi Yonezawa

Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japanyonezawa@me.es.osaka-u.ac.jp

Mohamed Farhat

 Laboratory for Hydraulic Machines (LMH-IMHEF), École Polytechnique Fédérale de Lausanne (EPFL), Avenue de Cour 33bis, CH-1007 Lausanne, Switzerlandmohamed.farhat@epfl.ch

Francois Avellan

 Laboratory for Hydraulic Machines (LMH-IMHEF), École Polytechnique Fédérale de Lausanne (EPFL), Avenue de Cour 33bis, CH-1007 Lausanne, Switzerlandfrancois.avellan@epfl.ch

Yoshinobu Tsujimoto

Department of Mechanical Science and Bioengineering, Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japantujimoto@me.es.osaka-u.ac.jp

J. Fluids Eng 130(4), 041106 (Apr 14, 2008) (6 pages) doi:10.1115/1.2903475 History: Received September 27, 2007; Revised January 15, 2008; Published April 14, 2008

One-dimensional stability analysis of a hydraulic system composed of a penstock, a runner, and a draft tube was carried out to determine the cause of the full load draft tube surge. It is assumed that the cavity volume at the runner exit is a function of the pressure at the vortex core evaluated from the instantaneous local pressure at the runner exit and an additional pressure decrease due to the centrifugal force on the swirling flow. It was found that the diffuser effect of the draft tube has a destabilizing effect over all flow rates, while the swirl effects stabilize∕destabilize the system at larger∕smaller flow rates than the swirl-free flow rate. Explanations of the destabilizing mechanism are given for the diffuser and swirl flow effects.

FIGURES IN THIS ARTICLE
<>
Copyright © 2008 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Hydraulic system for the analysis

Grahic Jump Location
Figure 2

Velocity triangle at the runner exit for three flow rates

Grahic Jump Location
Figure 3

Effects of mean flow rate Q¯ under standard conditions

Grahic Jump Location
Figure 4

Effects of diffusion factor D under α=0

Grahic Jump Location
Figure 5

Effects of pressure coefficient of swirl α under D−ζ2=0

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