Publication detail

Influence of low-specific speed pump modifications on stability of Y-Q curve

KLAS, R. POCHYLÝ, F. RUDOLF, P.

Czech title

Vliv modifikací hydrodynamického čerpadla o nízké rychloběžnosti na stabilitu Y - Q charakteristiky

English title

Influence of low-specific speed pump modifications on stability of Y-Q curve

Type

conference paper

Language

en

Original abstract

Contribution is focused on modification of low-specific speed pump impellers with respect to stability of their Y-Q curves (i.e. head curves). The design modifications are driven by analysis of the dissipated power. First, dissipated power is evaluated by CFD software in individual working parts of the pump and then its dependence on flow rate is investigated. Pressure fields within the pump are also carefully examined. Special attention is paid to impellers and configuration of the blade channels and recirculating channels. Results point to significant influence of the proper inflow to recirculating channels and also to role of the volute, which is more pronounced than in conventional impellers. All integral characteristics from CFD simulations are verified experimentally.

Czech abstract

Příspěvek je zaměřen na modifikaci nízkospecifických oběžných kol čerpadla s ohledem na stabilitu jejich YQ křivek (tj. dopravní výšky). Změny designu korespondují s analýzou disipovaného výkonu. Disipovaný výkon je vyhodnocen CFD softwarem v jednotlivých pracovních částí čerpadla a následně je zkoumána jeho závislost na průtoku. To se týká i analýzy tlakových polí v interiéru čerpadla. Zvláštní pozornost je věnována oběžnýcm kolům a konfiguraci lopatkových kanálů a recirkulačních kanálků. Výsledky ukazují jejich významný vliv na vhodný nátok do recirkulačních kanálů a také vliv spirály. Tento vliv je výraznější než u běžných čerpadel. Integrální charakteristiky získané z CFD simulací byly následně experimentálně ověřeny.

English abstract

Contribution is focused on modification of low-specific speed pump impellers with respect to stability of their Y-Q curves (i.e. head curves). The design modifications are driven by analysis of the dissipated power. First, dissipated power is evaluated by CFD software in individual working parts of the pump and then its dependence on flow rate is investigated. Pressure fields within the pump are also carefully examined. Special attention is paid to impellers and configuration of the blade channels and recirculating channels. Results point to significant influence of the proper inflow to recirculating channels and also to role of the volute, which is more pronounced than in conventional impellers. All integral characteristics from CFD simulations are verified experimentally.

Keywords in English

low-specific speed pump, stability, CFD, recirculating channels

RIV year

2015

Released

06.05.2015

Publisher

EDP Sciences

ISSN

2100-014X

Book

EPJ Web of Conferences

Volume

92

Number

1

Pages from–to

1–6

Pages count

6

BIBTEX


@inproceedings{BUT114854,
  author="Roman {Klas} and František {Pochylý} and Pavel {Rudolf},
  title="Influence of low-specific speed pump modifications on stability of Y-Q curve",
  booktitle="EPJ Web of Conferences",
  year="2015",
  volume="92",
  number="1",
  month="May",
  pages="1--6",
  publisher="EDP Sciences",
  issn="2100-014X"
}