Detail publikace
Mitigation of swirling flow with a vortex rope by passive installations—Theory, simulations, and experiments
URBAN, O. KURKOVÁ, M. POCHYLÝ, F.
Anglický název
Mitigation of swirling flow with a vortex rope by passive installations—Theory, simulations, and experiments
Typ
Článek WoS
Jazyk
en
Originální abstrakt
This work is focused on reduction of swirling in cases from hydraulic machinery and, thus, mitigation of instabilities associated with swirling flow. We study this problem analytically using the torque integral equation, numerically using computational fluid dynamics (CFD) simulations, and experimentally using a swirl generator that generates swirling flow approximating that in a draft tube of a hydro turbine operating at a part load, featuring an unsteady spiral vortex—the vortex rope. The analytical description elucidates the effect of different installations on the circumferential velocity. Unconventional conical perforated installations targeting at increasing the dissipation were proposed and tested. The rather unsatisfactory results led to proposing fins placed unconventionally away from the wall, closer to the diffuser axis, which were subsequently shown to be able to reliably suppress the unsteady vortex rope. Their effect is documented by an analysis of CFD results including the proper orthogonal decomposition as well as experimental observations and measurements.
Klíčová slova anglicky
swirling flow; vortex rope; passive flow control
Vydáno
2022-12-22
Nakladatel
AIP Publishing
ISSN
1070-6631
Časopis
Physics of fluids
Ročník
34
Číslo
12
Strany od–do
1–18
Počet stran
18
BIBTEX
@article{BUT182717,
author="Ondřej {Urban} and Michaela {Kurková} and František {Pochylý}",
title="Mitigation of swirling flow with a vortex rope by passive installations—Theory, simulations, and experiments",
journal="Physics of fluids",
year="2022",
volume="34",
number="12",
pages="1--18",
doi="10.1063/5.0128029",
issn="1070-6631",
url="https://aip.scitation.org/doi/full/10.1063/5.0128029"
}