Publication detail

On the existence of adverse pressure gradient in decelerated swirling flow and its suppression by water jet injection

URBAN, O. RUDOLF, P.

Original Title

On the existence of adverse pressure gradient in decelerated swirling flow and its suppression by water jet injection

Type

conference paper

Language

English

Original Abstract

The paper revisits the theory originally published by Hall that explains the presence of adverse pressure gradient at the axis of a diffuser with swirling flow. It presents the fields of the axial pressure derivative obtained by CFD simulations of flow in a swirl generator, which support the theory. The last part brings cautionary results regarding the suppression of the backflow caused by this adverse pressure gradient by water jet injection. On a case with a strong swirl intensity leading to a strong vortex rope, it is shown that the injected jet may be deflected to the outer walls and rotate with the outer swirling flow, eventually leading to stronger pressure pulsations than in the original state. Further investigation shows that high enough diameter of the jet is needed to ensure its stability.

Keywords

swirling flow; adverse pressure gradient; vortex rope; injection

Authors

URBAN, O.; RUDOLF, P.

Released

26. 6. 2022

Publisher

Institute of Physics

ISBN

1755-1307

Periodical

IOP Conference Series: Earth and Environmental Science

Year of study

1079

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

12

Pages count

12

URL

https://iopscience.iop.org/article/10.1088/1755-1315/1079/1/012054/pdf

BibTex

@inproceedings{BUT182652,
  author="Ondřej {Urban} and Pavel {Rudolf}",
  title="On the existence of adverse pressure gradient in decelerated swirling flow and its suppression by water jet injection",
  booktitle="IOP Conference Series: Earth and Environmental Science",
  year="2022",
  series="1079",
  journal="IOP Conference Series: Earth and Environmental Science",
  volume="1079",
  number="1",
  pages="1--12",
  publisher="Institute of Physics",
  doi="10.1088/1755-1315/1079/1/012054",
  issn="1755-1307",
  url="https://iopscience.iop.org/article/10.1088/1755-1315/1079/1/012054/pdf"
}