Detail publikačního výsledku

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

URBAN, O.; RUDOLF, P.

Originální název

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

Anglický název

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

Druh

Stať ve sborníku v databázi WoS či Scopus

Originální abstrakt

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.

Anglický abstrakt

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.

Klíčová slova

swirling flow; adverse pressure gradient; vortex rope; injection

Klíčová slova v angličtině

swirling flow; adverse pressure gradient; vortex rope; injection

Autoři

URBAN, O.; RUDOLF, P.

Rok RIV

2023

Vydáno

26.06.2022

Nakladatel

Institute of Physics

Kniha

IOP Conference Series: Earth and Environmental Science

Edice

1079

ISSN

1755-1307

Periodikum

IOP Conference Series: Earth and Environmental Science

Svazek

1079

Číslo

1

Stát

Spojené království Velké Británie a Severního Irska

Strany od

1

Strany do

12

Strany počet

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"
}