Publication detail

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

URBAN, O. RUDOLF, P.

English title

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

Type

Paper in proceedings (conference paper)

Language

en

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 in English

swirling flow; adverse pressure gradient; vortex rope; injection

Released

2022-06-26

Publisher

Institute of Physics

ISSN

1755-1307

Book

IOP Conference Series: Earth and Environmental Science

Journal

IOP Conference Series: Earth and Environmental Science

Volume

1079

Number

1

Pages from–to

1–12

Pages count

12

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"
}