Publication detail

Structure of Flow Fields Downstream of Two Different Swirl Generators

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

Original Title

Structure of Flow Fields Downstream of Two Different Swirl Generators

Type

journal article - other

Language

English

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 amplitude-frequency spectra of static wall pressure.

Keywords

swirl generator, vortex rope, velocity profiles, vorticity, pressure pulsations

Authors

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

RIV year

2014

Released

5. 2. 2014

ISBN

1805-4633

Periodical

Engineering Mechanics

Year of study

20

Number

5

State

Czech Republic

Pages from

339

Pages to

353

Pages count

15

URL

http://www.engineeringmechanics.cz/pdf/20_5_339.pdf

BibTex

@article{BUT105575,
  author="ŠTEFAN, D. and RUDOLF, P. and MUNTEAN, S. and SUSAN-RESIGA, R.",
  title="Structure of Flow Fields Downstream of Two Different Swirl Generators",
  journal="Engineering Mechanics",
  year="2014",
  volume="20",
  number="5",
  pages="339--353",
  issn="1805-4633",
  url="http://www.engineeringmechanics.cz/pdf/20_5_339.pdf"
}