Effect of the angle of attack on the transient lift during the interaction of a vortex with a flat plate. Potential theory and experimental results

Alaminos-Quesada, J.; Fernández‐Feria, R.

doi:10.1016/j.jfluidstructs.2017.07.013

Cited by 6 publications

(13 citation statements)

References 17 publications

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“…The results of [4,22,21] at moderate Reynolds numbers (Re ∼ 10 3 − 10 4 ) show that the times and intensities of these extrema depend on the intensity, size and vertical displacement of the vortex with respect to the airfoil. Similar conclusions are offered by [1], who propose a potential model to predict the lift force produced by a vortical gust. The model shows a moderately good agreement with the experimental results when the vertical distance between the vortex and the airfoil is sufficiently large, failing to predict head-on collisions.…”

Section: Introductionsupporting

confidence: 71%

“…For MAVs, the small size of the vehicle results in a localized gust, where the characteristic length of the velocity perturbation is of the same order of magnitude (or even smaller) than the chord of the airfoil. Most experimental and numerical realization of these types of gusts are based on either airfoils/wings passing over a vertical jet (i.e, localized transverse gusts as in 24,6,15,9), or airfoils/wings encountering a localized vortex in the free-stream (i.e., vortical gusts as in 12,4,30,1,22,21,5,7). The results of the localized transverse gusts are very similar to the plunge maneouvers discussed earlier when the jet width is sufficiently large [15,9].…”

Section: Introductionsupporting

confidence: 62%

See 1 more Smart Citation

Analysis of vortical gust impact on airfoils at low Reynolds number

Martínez-Muriel

Flores

2020

Journal of Fluids and Structures

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Section: Introductionsupporting

confidence: 71%

Section: Introductionsupporting

confidence: 62%

Analysis of vortical gust impact on airfoils at low Reynolds number

Martínez-Muriel

Flores

2020

Journal of Fluids and Structures

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“…The maximum lift is expected to be substantially smaller when the counter-clockwise vortex passes below the blade. 36…”

Section: Resultsmentioning

confidence: 99%

The effect of blade pitch on the flow dynamics inside the rotor of a three-straight-bladed cross-flow turbine

Somoano

Huera-Huarte

2018

Proceedings of the Institution of Mechanical Engineers, Part M:

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This study analyses the variations in flow dynamics inside the rotor of a three-straight-bladed cross-flow turbine for different blade pitches. A water towing tank facility has been used with a turbine model based on symmetric NACA-0015 profiles with a chord-to-diameter ratio of 0.16. The set-up was especially designed to measure the flow field inside and around the rotor, using planar digital particle image velocimetry. The experiments were made at a constant turbine diameter Reynolds number, [Formula: see text], of 6.1 × 104. The forced rotation of the cross-flow turbine using a direct current motor allowed changes in the ratio of the blade tangential speed to the freestream velocity (tip speed ratio), covering the range of 0.7–2.3. Toe-in and excessive toe-out angles have been associated in the past to low performances in this type of turbines. Pitch angle cases with expected low performances have been chosen, namely, [Formula: see text] of 8° toe-in and 16° toe-out, as well as a case with a high expected efficiency of 8° toe-out and another with [Formula: see text] as the reference case. The the goal is to better understand the flow dynamics and the blade–wake interactions inside the rotor of this type of machines, by studying cases with very different expected performances.

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“…(2014) that can perform regardless of amplitude and reduced frequency of motion, and impose no restrictions on the trailing-wake dynamics. Alaminos-Quesada & Fernandez-Feria (2017) use potential-flow theory to analyse the effect of the angle of attack on the interaction of a two-dimensional vortex with a flat plate. Wei & Zheng (2017 a ) present an approach to explain the formation of LEVs based on pressure distributions and adverse-pressure-gradient patterns using a simple theoretical model.…”

Section: Introductionmentioning

confidence: 99%