Publication detail

Spatio-temporal description of the swirling flow in hydraulic turbine draft tube

RUDOLF, P. ŠTEFAN, D.

Original Title

Spatio-temporal description of the swirling flow in hydraulic turbine draft tube

Type

conference paper

Language

English

Original Abstract

Highly swirling flow leaves runner of the hydraulic turbine, which is operated off the best efficiency point. Instability of the swirling flow results in so called vortex rope. Rotating vortex rope is a source of pressure pulsations, causes structural loads, vibrations and noise. Proper orthogonal decomposition (POD) provides a spatio-temporal description of the draft tube swirling flow and proves that only a very limited number of the flow eigenmodes is necessary to describe the flow dynamics. Construction of the reduced order model (ROM), which is derived by projection of Navier-Stokes equation onto POD basis forms a suitable state equation for the draft tube flow control. Paper presents review of POD application to draft tube flows and proposal of extension to ROM and closed loop flow control.

Keywords

draft tube, vortex rope, POD, ROM, control

Authors

RUDOLF, P.; ŠTEFAN, D.

RIV year

2014

Released

26. 11. 2014

Publisher

TU Wien

Location

Vienna

ISBN

978-3-9501937-9-4

Book

Proceedings of 18th International Seminar on Hydropower

Pages from

191

Pages to

201

Pages count

10

BibTex

@inproceedings{BUT111329,
  author="Pavel {Rudolf} and David {Štefan}",
  title="Spatio-temporal description of the swirling flow in hydraulic turbine draft tube",
  booktitle="Proceedings of 18th International Seminar on Hydropower",
  year="2014",
  pages="191--201",
  publisher="TU Wien",
  address="Vienna",
  isbn="978-3-9501937-9-4"
}