Publication detail

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

Type

conference paper

Language

English

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.

Keywords

diffuser; swirling flow; water injection; draft tube

Authors

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

Released

4. 6. 2018

Publisher

EDP Sciences

ISBN

2100-014X

Periodical

EPJ Web of Conferences

State

French Republic

Pages from

1

Pages to

6

Pages count

6

URL

https://www.epj-conferences.org/articles/epjconf/abs/2018/15/epjconf_efm2018_02090/epjconf_efm2018_02090.html

Full text in the Digital Library

http://hdl.handle.net/11012/196406

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"
}