Detail publikačního výsledku

Connection between inlet velocity field and diffuser flow instability

RUDOLF, P.

Original Title

Connection between inlet velocity field and diffuser flow instability

English Title

Connection between inlet velocity field and diffuser flow instability

Type

Peer-reviewed article not indexed in WoS or Scopus

Original Abstract

Simulations of the flow in a straight diffuser were carried out for different inlet velocity profiles equivalent to the real turbine operating points. Frequencies and magnitudes of pressure pulsations of the rotating vortex rope were recorded. Two types of vortices were detected. The first one is a thin vortex with higher frequency and relatively low pressure amplitudes corresponding to higher part load turbine operation. For lower loads, further from best efficiency point, a huge vortex rotating on higher diameter appears, which is accompanied by massive pressure pulsations, but with lower frequency. Connections of these two regimes with inlet circumferential velocity com-ponent are discussed in the paper.

English abstract

Simulations of the flow in a straight diffuser were carried out for different inlet velocity profiles equivalent to the real turbine operating points. Frequencies and magnitudes of pressure pulsations of the rotating vortex rope were recorded. Two types of vortices were detected. The first one is a thin vortex with higher frequency and relatively low pressure amplitudes corresponding to higher part load turbine operation. For lower loads, further from best efficiency point, a huge vortex rotating on higher diameter appears, which is accompanied by massive pressure pulsations, but with lower frequency. Connections of these two regimes with inlet circumferential velocity com-ponent are discussed in the paper.

Keywords

instability, diffuser, vortex rope, hydraulic turbine

Key words in English

instability, diffuser, vortex rope, hydraulic turbine

Authors

RUDOLF, P.

RIV year

2010

Released

01.06.2009

Publisher

University of West Bohemia

Location

Plzeň

ISBN

1802-680X

Periodical

Applied andComputational Mechanics

Volume

3

Number

1

State

Czech Republic

Pages from

177

Pages to

184

Pages count

8

Full text in the Digital Library

http://hdl.handle.net/

BibTex

@article{BUT47117,
  author="Pavel {Rudolf}",
  title="Connection between inlet velocity field and diffuser flow instability",
  journal="Applied andComputational Mechanics",
  year="2009",
  volume="3",
  number="1",
  pages="177--184",
  issn="1802-680X"
}