Publication detail

Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

ZEMANOVÁ, L. RUDOLF, P.

Original Title

Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review

Type

journal article in Web of Science

Language

English

Original Abstract

The paper critically reviews the current state of the art in flow inside sidewall gaps of hydraulic pumps and turbines. It describes the consequences of the presence of this type of flow in turbomachinery and then relates it to other physical phenomena that determine the behavior, operating characteristics, and overall performance of the machine. Despite the small dimensions of the rotor-stator spaces, the flow in these regions can significantly affect the overall flow field and, consequently, efficiency. The circulation of the fluid inside the gaps and secondary flow that is caused by rotating elements influences the disk friction losses, which is of great importance, especially in the case of low specific speed pumps and turbines. The flow pattern affects the pressure distribution inside a machine and, thus, generates axial thrust. The presence of secondary flow also significantly changes the rotordynamics and can bring about undesirable vibrations and acoustics issues. This article aims to review and summarize the studies that were conducted on the mentioned phenomena. Experimental and numerical studies are both taken into consideration. It proposes some requirements for prospective research in order to fill current gaps in the literature and reveals the upcoming challenges in the design of hydraulic machines

Keywords

hydraulic machines; pumps; turbines; sidewall gap flow; disk friction; axial thrust

Authors

ZEMANOVÁ, L.; RUDOLF, P.

Released

15. 12. 2020

Publisher

MDPI

ISBN

1996-1073

Periodical

ENERGIES

Year of study

13

Number

24

State

Swiss Confederation

Pages from

1

Pages to

37

Pages count

37

URL

https://www.mdpi.com/1996-1073/13/24/6617

Full text in the Digital Library

http://hdl.handle.net/11012/195841

BibTex

@article{BUT167277,
  author="Lucie {Zemanová} and Pavel {Rudolf}",
  title="Flow Inside the Sidewall Gaps of Hydraulic Machines: A Review",
  journal="ENERGIES",
  year="2020",
  volume="13",
  number="24",
  pages="1--37",
  doi="10.3390/en13246617",
  issn="1996-1073",
  url="https://www.mdpi.com/1996-1073/13/24/6617"
}