Publication result detail

Structure of Flow Fields Downstream of Two Different Swirll Generators

ŠTEFAN, D.; RUDOLF, P.; MUNTEAN, S.; SUSAN-RESIGA, R.F.

Original Title

Structure of Flow Fields Downstream of Two Different Swirll Generators

English Title

Structure of Flow Fields Downstream of Two Different Swirll Generators

Type

Paper in proceedings (conference paper)

Original Abstract

This paper discusses the comparison of the flow fields downstream of two different swirl generators. Both swirl generators are used to imitate the flow at the exit of the hydraulic turbine runner and study spatio-temporal behaviour of the swirling flow in the draft tube (i.e. outlet diffuser part of the hydraulic turbine), which undergoes breakdown into vortex rope. Unsteady CFD computations are carried out for identical Reynolds number. Resulting velocity and vorticity profiles are correlated with the structure of the vortex rope. Difference in excited pressure pulsations is illustrated on amplitudefrequency spectra of static wall pressure.

English abstract

This paper discusses the comparison of the flow fields downstream of two different swirl generators. Both swirl generators are used to imitate the flow at the exit of the hydraulic turbine runner and study spatio-temporal behaviour of the swirling flow in the draft tube (i.e. outlet diffuser part of the hydraulic turbine), which undergoes breakdown into vortex rope. Unsteady CFD computations are carried out for identical Reynolds number. Resulting velocity and vorticity profiles are correlated with the structure of the vortex rope. Difference in excited pressure pulsations is illustrated on amplitudefrequency spectra of static wall pressure.

Keywords

swirl generator, vortex rope, velocity profile, vorticity, pressure fluctuations.

Key words in English

swirl generator, vortex rope, velocity profile, vorticity, pressure fluctuations.

Authors

ŠTEFAN, D.; RUDOLF, P.; MUNTEAN, S.; SUSAN-RESIGA, R.F.

RIV year

2013

Released

14.05.2012

Location

Prague

ISBN

978-80-86246-39-0

Book

Engineering Mechanics 2012, Book of Extended Abstracts

Pages from

326

Pages to

327

Pages count

408

URL

http://www.engmech.cz/2012/proceedings/pdf/057_Stefan_D-FT.pdf

Full text in the Digital Library

http://hdl.handle.net/11012/245284

BibTex

@inproceedings{BUT92005,
  author="ŠTEFAN, D. and RUDOLF, P. and MUNTEAN, S. and SUSAN-RESIGA, R.F.",
  title="Structure of Flow Fields Downstream of Two Different Swirll Generators",
  booktitle="Engineering Mechanics 2012, Book of Extended Abstracts",
  year="2012",
  pages="326--327",
  address="Prague",
  isbn="978-80-86246-39-0",
  url="http://www.engmech.cz/2012/proceedings/pdf/057_Stefan_D-FT.pdf"
}

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