Streamwise Oscillation of Airfoils into Reverse Flow

Granlund, Kenneth; Ol, Michael V.; Jones, Anya R.

doi:10.2514/1.j054674

Cited by 21 publications

(7 citation statements)

References 13 publications

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“…In a cycle of the rotating rotor with variable-pitch motions, the oscillating airfoils often experience the advancing and retreating sides, characterized by the different placements of the airfoil geometry (Granlund et al, 2016). As the airfoil blunt leading edge confronts with the incoming flows, it is in forward mode, which has been investigated widely before.…”

Section: Tablementioning

confidence: 99%

Parametrical study on separation-induced transition and vortex dynamics of a reversed pitching airfoil

et al. 2022

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Section: Tablementioning

confidence: 99%

Parametrical study on separation-induced transition and vortex dynamics of a reversed pitching airfoil

et al. 2022

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“…More recent efforts have sought to expand the understanding of separated aerofoil flows to cases where the free-stream velocity is time varying (Choi, Colonius & Williams 2015;Granlund, Ol & Jones 2016;Kocher et al 2017;Kirk & Jones 2018). Of particular note, Dunne & McKeon (2015) considered the case of a NACA 0018 wing undergoing a simultaneous surging and pitching manoeuvre.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vortex formation on a pitching aerofoil at high surging amplitudes

Smith

Jones

2020

J. Fluid Mech.

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“…Harbig, Sheridan & Thompson (2014) provided a detailed map of vortex stability over various advance ratios and aspect ratios for kinematics that included reverse flow, but the authors did not directly address changes in the two-dimensional (2-D) and three-dimensional (3-D) vortex dynamics. Granlund, Ol & Jones (2016) performed experiments that mirror the unsteady free stream experienced by a rotating wing in forward flight, but the authors did not investigate how their results would change in the presence of rotation.…”

Section: Introductionmentioning

confidence: 99%

The role of rotary motion on vortices in reverse flow

et al. 2019

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The physics of a rotary wing in forward flight are highly complex, particularly when flow separation is involved. The purpose of this work is to assess the role of three-dimensional (3-D) vortex dynamics, with a focus on Coriolis forces, in the evolution of vortices in the reverse flow region of a rotating wing. High-fidelity numerical simulations were performed to recreate the flow about a representative rotating wing in forward flight. A vorticity transport analysis was performed to quantify and compare the magnitudes of 2-D flow physics, vortex tilting and Coriolis effects in the resulting flow fields. Three-dimensional vortex dynamics was found to have a very small impact on the growth and behaviour of vortices in the reverse flow region; in fact, the rate of vortex growth was successfully modelled using a simple 2-D vortex method. The small role of 3-D physics was attributed to the Coriolis and vortex tilting terms being approximately equal and opposite to one another. This ultimately lead to vortex behaviour that more closely resembled a surging wing as opposed to a conventional rotating wing, a feature unique to the reverse flow region.

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Streamwise Oscillation of Airfoils into Reverse Flow

Cited by 21 publications

References 13 publications

Parametrical study on separation-induced transition and vortex dynamics of a reversed pitching airfoil

Parametrical study on separation-induced transition and vortex dynamics of a reversed pitching airfoil

Vortex formation on a pitching aerofoil at high surging amplitudes

The role of rotary motion on vortices in reverse flow

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