Publication result detail

Decomposition of the swirling flow field downstream of Francis turbine runner

RUDOLF, P.; ŠTEFAN, D.

Original Title

Decomposition of the swirling flow field downstream of Francis turbine runner

English Title

Decomposition of the swirling flow field downstream of Francis turbine runner

Type

Paper in proceedings (conference paper)

Original Abstract

Practical application of proper orthogonal decomposition (POD) is presented. Spatio-temporal behaviour of the coherent vortical structures in the draft tube of hydraulic turbine is studied for two partial load operating points. POD enables to identify the eigen modes, which compose the flow field and rank the modes according to their energy. Swirling flow fields are decomposed, which provides information about their streamwise and crosswise development and the energy transfer among modes. Presented methodology also assigns frequencies to the particular modes, which helps to identify the spectral properties of the flow with concrete mode shapes. Thus POD offers a complementary view to current time domain simulations or measurements.

English abstract

Practical application of proper orthogonal decomposition (POD) is presented. Spatio-temporal behaviour of the coherent vortical structures in the draft tube of hydraulic turbine is studied for two partial load operating points. POD enables to identify the eigen modes, which compose the flow field and rank the modes according to their energy. Swirling flow fields are decomposed, which provides information about their streamwise and crosswise development and the energy transfer among modes. Presented methodology also assigns frequencies to the particular modes, which helps to identify the spectral properties of the flow with concrete mode shapes. Thus POD offers a complementary view to current time domain simulations or measurements.

Keywords

decomposition, swirling flow, proper orthogonal decomposition, stability, vortex rope, draft tube

Key words in English

decomposition, swirling flow, proper orthogonal decomposition, stability, vortex rope, draft tube

Authors

RUDOLF, P.; ŠTEFAN, D.

RIV year

2013

Released

18.12.2012

Publisher

IOP Publishing Ltd.

Book

IOP Conference Series-Earth and Environmental Science

ISBN

1755-1315

Periodical

IOP Conference Series: Earth and Environmental Science

Volume

15

Number

6

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

http://dx.doi.org/10.1088/1755-1315/15/6/062008

BibTex

@inproceedings{BUT97197,
  author="Pavel {Rudolf} and David {Štefan}",
  title="Decomposition of the swirling flow field downstream of Francis turbine runner",
  booktitle="IOP Conference Series-Earth and Environmental Science",
  year="2012",
  journal="IOP Conference Series: Earth and Environmental Science",
  volume="15",
  number="6",
  pages="1--8",
  publisher="IOP Publishing Ltd.",
  doi="10.1088/1755-1315/15/6/062008",
  issn="1755-1315",
  url="http://dx.doi.org/10.1088/1755-1315/15/6/062008"
}