Energy transformation and flow topology in an elbow draft tube

Authors

  • David Štefan Faculty of Mechanical Engineering, Brno University of Technology
  • Pavel Rudolf Faculty of Mechanical Engineering, Brno University of Technology
  • Aleš Skoták ČKD Blansko Engineering, a.s.
  • Lukáš Motyčák ČKD Blansko Engineering, a.s.

Keywords:

draft tube, efficiency, pressure recovery, flow topology

Abstract

Paper presents a computational study of energy transformation in two geometrical configurations of Kaplan turbine elbow draft tube. Pressure recovery, hydraulic efficiency and loss coefficient are evaluated for a series of flow rates and swirl numbers corresponding to operating regimes of the turbine. These integral characteristics are then correlated with local flow field properties identified by extraction of topological features. Main focus is to find the reasons for hydraulic efficiency drop of the elbow draft tube.

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Published

30-Jun-2012

Issue

Vol. 6 No. 1 (2012)

Section

Articles

License

Copyright (c) 2016 Applied and Computational Mechanics

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.

How to Cite

“Energy transformation and flow topology in an elbow draft tube” (2012) Applied and Computational Mechanics, 6(1). Available at: https://acm.kme.zcu.cz//article/view/173 (Accessed: 26 June 2025).