Vortex coupling in trailing vortex-wing interactions

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The interaction of trailing vortices of an upstream wing with rigid and flexible downstream wings has been investigated experimentally in a wind tunnel, using particle image velocimetry, hot-wire, force and deformation measurements. Counter-rotating upstream vortices exhibit increased meandering when they are close to the tip of the downstream wing. The upstream vortex forms a pair with the vortex shed from the downstream wing, and then exhibits large displacements around the wing-tip. This coupled motion of the pair has been found to cause large lift fluctuations on the downstream wing. The meandering of the vortex pair occurs at the natural meandering frequency of the isolated vortex, with a low Strouhal number, and is not affected by the frequency of the large-amplitude wing oscillations if the downstream wing is flexible. The displacement of the leading vortex is larger than that of the trailing vortex, however it causes highly correlated variations of the core radius, core vorticity and circulation of the trailing vortex with the coupled meandering motion. In contrast, co-rotating vortices do not exhibit any increased meandering.
LanguageEnglish
Article number034704
JournalPhysical Review Fluids
Volume3
Issue number3
Early online date28 Mar 2018
DOIs
StatusPublished - Mar 2018

Fingerprint

Vortex
Vortex flow
Interaction
Flexible wings
Rotating
Strouhal number
Large Displacements
Motion
Wind Tunnel
Vorticity
Natural Frequency
Velocity measurement
Wind tunnels
Natural frequencies
Radius
Wire
Oscillation
Fluctuations

ASJC Scopus subject areas

  • Computational Mechanics
  • Modelling and Simulation
  • Fluid Flow and Transfer Processes

Cite this

Vortex coupling in trailing vortex-wing interactions. / Chen, Chen; Wang, Zhijin; Gursul, Ismet.

In: Physical Review Fluids, Vol. 3, No. 3, 034704, 03.2018.

Research output: Contribution to journalArticle

@article{306884989779400a85ef7e0347813d64,
title = "Vortex coupling in trailing vortex-wing interactions",
abstract = "The interaction of trailing vortices of an upstream wing with rigid and flexible downstream wings has been investigated experimentally in a wind tunnel, using particle image velocimetry, hot-wire, force and deformation measurements. Counter-rotating upstream vortices exhibit increased meandering when they are close to the tip of the downstream wing. The upstream vortex forms a pair with the vortex shed from the downstream wing, and then exhibits large displacements around the wing-tip. This coupled motion of the pair has been found to cause large lift fluctuations on the downstream wing. The meandering of the vortex pair occurs at the natural meandering frequency of the isolated vortex, with a low Strouhal number, and is not affected by the frequency of the large-amplitude wing oscillations if the downstream wing is flexible. The displacement of the leading vortex is larger than that of the trailing vortex, however it causes highly correlated variations of the core radius, core vorticity and circulation of the trailing vortex with the coupled meandering motion. In contrast, co-rotating vortices do not exhibit any increased meandering.",
author = "Chen Chen and Zhijin Wang and Ismet Gursul",
year = "2018",
month = "3",
doi = "10.1103/PhysRevFluids.3.034704",
language = "English",
volume = "3",
journal = "Physical Review Fluids",
issn = "2469-990X",
publisher = "American Physical Society",
number = "3",

}

TY - JOUR

T1 - Vortex coupling in trailing vortex-wing interactions

AU - Chen, Chen

AU - Wang, Zhijin

AU - Gursul, Ismet

PY - 2018/3

Y1 - 2018/3

N2 - The interaction of trailing vortices of an upstream wing with rigid and flexible downstream wings has been investigated experimentally in a wind tunnel, using particle image velocimetry, hot-wire, force and deformation measurements. Counter-rotating upstream vortices exhibit increased meandering when they are close to the tip of the downstream wing. The upstream vortex forms a pair with the vortex shed from the downstream wing, and then exhibits large displacements around the wing-tip. This coupled motion of the pair has been found to cause large lift fluctuations on the downstream wing. The meandering of the vortex pair occurs at the natural meandering frequency of the isolated vortex, with a low Strouhal number, and is not affected by the frequency of the large-amplitude wing oscillations if the downstream wing is flexible. The displacement of the leading vortex is larger than that of the trailing vortex, however it causes highly correlated variations of the core radius, core vorticity and circulation of the trailing vortex with the coupled meandering motion. In contrast, co-rotating vortices do not exhibit any increased meandering.

AB - The interaction of trailing vortices of an upstream wing with rigid and flexible downstream wings has been investigated experimentally in a wind tunnel, using particle image velocimetry, hot-wire, force and deformation measurements. Counter-rotating upstream vortices exhibit increased meandering when they are close to the tip of the downstream wing. The upstream vortex forms a pair with the vortex shed from the downstream wing, and then exhibits large displacements around the wing-tip. This coupled motion of the pair has been found to cause large lift fluctuations on the downstream wing. The meandering of the vortex pair occurs at the natural meandering frequency of the isolated vortex, with a low Strouhal number, and is not affected by the frequency of the large-amplitude wing oscillations if the downstream wing is flexible. The displacement of the leading vortex is larger than that of the trailing vortex, however it causes highly correlated variations of the core radius, core vorticity and circulation of the trailing vortex with the coupled meandering motion. In contrast, co-rotating vortices do not exhibit any increased meandering.

UR - http://www.scopus.com/inward/record.url?scp=85044938758&partnerID=8YFLogxK

U2 - 10.1103/PhysRevFluids.3.034704

DO - 10.1103/PhysRevFluids.3.034704

M3 - Article

VL - 3

JO - Physical Review Fluids

T2 - Physical Review Fluids

JF - Physical Review Fluids

SN - 2469-990X

IS - 3

M1 - 034704

ER -