Publication result detail

Influence of swirl ratio on the onset of columnar vortices in the mixing part of swirl generator

ŠTEFAN, D.; URBAN, O.; RUDOLF, P.

Original Title

Influence of swirl ratio on the onset of columnar vortices in the mixing part of swirl generator

English Title

Influence of swirl ratio on the onset of columnar vortices in the mixing part of swirl generator

Type

Paper in proceedings (conference paper)

Original Abstract

The study presents analysis of conditions for the onset of columnar vortices in the mixing part of swirl generator. 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. The main aim for the current study is the mixing mechanism, which is realized in the part where the axial inflow meets the tangential one. Since there are no guide vanes or other driving geometry features, 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. For the better understanding of this mixing mechanism, which may influence the flow downstream and consequently the generated vortex, the several swirl ratios of axial and tangential inflow were studied. The dynamic of vortices are extracted using A-f analysis and proper orthogonal decomposition. The results are based on the CFD simulation employing a hybrid RANS+LES turbulence models.

English abstract

The study presents analysis of conditions for the onset of columnar vortices in the mixing part of swirl generator. 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. The main aim for the current study is the mixing mechanism, which is realized in the part where the axial inflow meets the tangential one. Since there are no guide vanes or other driving geometry features, 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. For the better understanding of this mixing mechanism, which may influence the flow downstream and consequently the generated vortex, the several swirl ratios of axial and tangential inflow were studied. The dynamic of vortices are extracted using A-f analysis and proper orthogonal decomposition. The results are based on the CFD simulation employing a hybrid RANS+LES turbulence models.

Keywords

swirling flow;vortices;CFD

Key words in English

swirling flow;vortices;CFD

Authors

ŠTEFAN, D.; URBAN, O.; RUDOLF, P.

Released

07.04.2025

Publisher

 Institute of Physics

Book

IOP Conference Series: Earth and Environmental Science

ISBN

1755-1307

Periodical

IOP Conference Series: Earth and Environmental Science

Volume

1483

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

https://iopscience.iop.org/article/10.1088/1755-1315/1483/1/012032

Full text in the Digital Library

http://hdl.handle.net/

BibTex

@inproceedings{BUT197631,
  author="David {Štefan} and Ondřej {Urban} and Pavel {Rudolf}",
  title="Influence of swirl ratio on the onset of columnar vortices in the mixing part of swirl generator",
  booktitle="IOP Conference Series: Earth and Environmental Science",
  year="2025",
  journal="IOP Conference Series: Earth and Environmental Science",
  volume="1483",
  number="1",
  pages="1--8",
  publisher=" Institute of Physics",
  doi="10.1088/1755-1315/1483/1/012032",
  issn="1755-1307",
  url="https://iopscience.iop.org/article/10.1088/1755-1315/1483/1/012032"
}