Publication detail

Analysis of novel low specific speed pump designs

KLAS, R. POCHYLÝ, F. RUDOLF, P.

Original Title

Analysis of novel low specific speed pump designs

Type

conference paper

Language

English

Original Abstract

Centrifugal pumps with very low specific speed present significant design challenges. Narrow blade channels, large surface area of hub and shroud discs relative to the blade area, and the presence of significant of blade channel vortices are typical features linked with the difficulty to achieve head and efficiency requirements for such designs. This paper presents an investigation of two novel designs of very low specific speed impellers: impeller having blades with very thick trailing edges and impeller with thick trailing edges and recirculating channels, which are bored along the impeller circumference. Numerical simulations and experimental measurements were used to study the flow dynamics of those new designs. It was shown that thick trailing edges suppress local eddies in the blade channels and decrease energy dissipation due to excessive swirling. Furthermore the recirculating channels will increase the circumferential velocity component on impeller outlet thus increasing the specific energy, albeit adversely affecting the hydraulic efficiency. Analysis of the energy dissipation in the volute showed that the number of the recirculating channels, their geometry and location, all have significant impact on the magnitude of dissipated energy and its distribution which in turn influences the shape of the head curve and the stability of the pump operation. Energy dissipation within whole pump interior (blade channels, volute, rotor-stator gaps) was also studied.

Keywords

low specific speed pump, recirculating channels, energy dissipation

Authors

KLAS, R.; POCHYLÝ, F.; RUDOLF, P.

RIV year

2014

Released

1. 12. 2014

Publisher

IOP Science

Location

Spojené království Velké Británie a Severního Irska

ISBN

1755-1315

Periodical

IOP Conference Series: Earth and Environmental Science

Year of study

22

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

11

Pages count

11

URL

http://iopscience.iop.org/1755-1315/22/1/012010/pdf/1755-1315_22_1_012010.pdf

BibTex

@inproceedings{BUT111384,
  author="Roman {Klas} and František {Pochylý} and Pavel {Rudolf}",
  title="Analysis of novel low specific speed pump designs",
  booktitle="Earth and Environmental Science",
  year="2014",
  journal="IOP Conference Series: Earth and Environmental Science",
  volume="22",
  number="1",
  pages="1--11",
  publisher="IOP Science",
  address="Spojené království Velké Británie a Severního Irska",
  doi="10.1088/1755-1315/22/1/012010",
  issn="1755-1315",
  url="http://iopscience.iop.org/1755-1315/22/1/012010/pdf/1755-1315_22_1_012010.pdf"
}