Detail publikačního výsledku

Manipulation of the swirling flow instability in hydraulic turbine diffuser by different methods of water injection

RUDOLF, P.; LITERA, J.; IBARRA BOLANOS, G.; ŠTEFAN, D.

Original Title

Manipulation of the swirling flow instability in hydraulic turbine diffuser by different methods of water injection

English Title

Manipulation of the swirling flow instability in hydraulic turbine diffuser by different methods of water injection

Type

Paper in proceedings (conference paper)

Original Abstract

Vortex rope, which induces substantial pressure pulsations, arises in the draft tube (diffuser) of Francis turbine for off-design operating conditions. Present paper focuses on mitigation of those pulsations using active water jet injection control. Several modifications of the original Susan-Resiga’s idea were proposed. All modifications are driven by manipulation of the shear layer region, which is believed to play important role in swirling flow instability. While some of the methods provide results close to the original one, none of them works in such a wide range. Series of numerical experiments support the idea that the necessary condition for vortex rope pulsation mitigation is increasing the fluid momentum along the draft tube axis.

English abstract

Vortex rope, which induces substantial pressure pulsations, arises in the draft tube (diffuser) of Francis turbine for off-design operating conditions. Present paper focuses on mitigation of those pulsations using active water jet injection control. Several modifications of the original Susan-Resiga’s idea were proposed. All modifications are driven by manipulation of the shear layer region, which is believed to play important role in swirling flow instability. While some of the methods provide results close to the original one, none of them works in such a wide range. Series of numerical experiments support the idea that the necessary condition for vortex rope pulsation mitigation is increasing the fluid momentum along the draft tube axis.

Keywords

diffuser; swirling flow; water injection; draft tube

Key words in English

diffuser; swirling flow; water injection; draft tube

Authors

RUDOLF, P.; LITERA, J.; IBARRA BOLANOS, G.; ŠTEFAN, D.

RIV year

2019

Released

04.06.2018

Publisher

EDP Sciences

Book

EPJ Web of Conferences

ISBN

2100-014X

Periodical

EPJ Web of Conferences

State

French Republic

Pages from

1

Pages to

6

Pages count

6

URL

Full text in the Digital Library

BibTex

@inproceedings{BUT148700,
  author="Pavel {Rudolf} and Jiří {Litera} and Germán Alejandro {Ibarra Bolanos} and David {Štefan}",
  title="Manipulation of the swirling flow instability in hydraulic turbine diffuser by different methods of water injection",
  booktitle="EPJ Web of Conferences",
  year="2018",
  journal="EPJ Web of Conferences",
  pages="1--6",
  publisher="EDP Sciences",
  doi="10.1051/epjconf/201817002090",
  issn="2100-014X",
  url="https://www.epj-conferences.org/articles/epjconf/abs/2018/15/epjconf_efm2018_02090/epjconf_efm2018_02090.html"
}

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