Publication detail

Assessment of the distributor layout influence on the vortical flow within the hydraulic turbine

ŠTEFAN, D. KLEMENT, J. URBAN, O. RUDOLF, P.

Original Title

Assessment of the distributor layout influence on the vortical flow within the hydraulic turbine

Type

conference paper

Language

English

Original Abstract

The study presents analysis of conditions for the onset of vortices in the simplified geometry of the turbine domain. The simplified geometry, used for this analysis, is based on the physical model of the bladeless swirl generator developed by the research group from Brno University of Technology. This swirl generator was previously used for several studies of the spiral vortex structures generated in the diffuser part. In original geometry there are no guide vanes or other driving geometry features, thus the mixing mechanism is realized randomly, is strongly time-dependent and its behavior is linked to the swirl ratio between the axial and tangential inflows. From previous studies, the appearance of vortical structures with columnar-like shape was identified. Thus, the main aim for the current study is to assess the influence of distributor blade cascade on the onset and behavior of such vortical structures which resembles the ones observed in hydraulic turbines at low load conditions. For selected swirl ratio the distributor blades are designed specifically to influence flow with minimal effect. The distributor layouts with different number of blades are tested. The dynamics of vortices, their spatial shape and extend are examined through several post-processing tools. The results are mainly based on the CFD simulation employing a hybrid RANS+LES turbulence model.

Keywords

hydraulic turbine; distributor; guide vanes; vortices; vortex

Authors

ŠTEFAN, D.; KLEMENT, J.; URBAN, O.; RUDOLF, P.

Released

16. 12. 2024

Publisher

 Institute of Physics

ISBN

1755-1307

Periodical

IOP Conference Series: Earth and Environmental Science

Year of study

1411

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

10

Pages count

10

URL

https://iopscience.iop.org/article/10.1088/1755-1315/1411/1/012069

BibTex

@inproceedings{BUT193666,
  author="David {Štefan} and Jan {Klement} and Ondřej {Urban} and Pavel {Rudolf}",
  title="Assessment of the distributor layout influence on the vortical flow within the hydraulic turbine",
  booktitle="IOP Conference Series: Earth and Environmental Science",
  year="2024",
  journal="IOP Conference Series: Earth and Environmental Science",
  volume="1411",
  number="1",
  pages="1--10",
  publisher=" Institute of Physics",
  doi="10.1088/1755-1315/1411/1/012069",
  issn="1755-1307",
  url="https://iopscience.iop.org/article/10.1088/1755-1315/1411/1/012069"
}