On the global flow-field dynamics around an airfoil

Uruba, Václav; Procházka, Pavel; Skala, Václav

doi:10.1051/epjconf/201921302089

Cited by 2 publications

(4 citation statements)

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“…The situation is schematically depicted in Figure 1. In paper [13] there is description of the global flow around the plate in the plane of symmetry (yz). In Figure 2 there is a detail of the plate trailing edge and mean velocity distribution in the wake.…”

Section: Methodsmentioning

confidence: 99%

Structure of the Wake Behind an Airfoil

Uruba¹,

Procházka²,

Skala³

2019

Topical Problems of Fluid Mechanics 2019

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The wake behind an inclined plate simulating airfoil is to be studied experimentally. The vortical structures are identified eventually. Theirs topology and dynamical behaviour is to be studied in details using the Proper Orthogonal Decomposition method. The stereo timeresolved Particle Image Velocimetry technique is used for the experimental research. The vortex trains with oblique orientation and chequered topology have been detected.

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Section: Methodsmentioning

confidence: 99%

Structure of the Wake Behind an Airfoil

Uruba¹,

Procházka²,

Skala³

2019

Topical Problems of Fluid Mechanics 2019

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“…All these non-dimension positions of planes were set inside the wake. One plane of measurement was established to cross all previously mentioned which should provide the existence of spanwise vortical structures [8]. This plane (blue color in Fig.…”

Section: Model Geometrymentioning

confidence: 99%

“…The FoV is full of various vortices, the flow is irregular and perturbed. The wake is extended with downstream coordinate and due to downwash effect is deflected below (see also [8]). While the velocity outside the wake is close to inlet velocity 5 m s 1 (red color), the wake center is full of streamwise-oriented vortices accompanied by speed deceleration (left column of Fig.…”

Section: Instantaneous Velocitiesmentioning

confidence: 99%

“…During foregoing studies, a detail study of the flow field in the vicinity of such profile was examined. For example, the separation zone behind leading edge and vortex shedding frequency from longitudinal plane [8] or the information about the shear stresses at suction side [9] was presented recently. Unlike the previously mentioned studies, current investigation of vorticity is based on measurement taken by stereo (3C2D) Particle Image Velocimetry (PIV) measurements.…”

Section: Introductionmentioning

confidence: 99%

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Streamwise and spanwise vortical structure merging inside the wake of an inclined flat plate

Procházka

Uruba

2019

Mechanics & Industry

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The aim of this paper is to study the physics related to lift generation on an airfoil. A new hypothesis [1] of physical mechanism of flight relies on existence of streamwise vortical structures above the wing and inside the wake. The vortices origin as a consequence of flow instability inside the boundary layer developed under adverse pressure gradient. These structures are highly dynamical in nature, they change position and size very rapidly. A simple airfoil in the form of a flat plate with moderate angle of attack is considered in the presented research that generates suitable flow at rather low Reynolds number. Stereo PIV time resolved measurement technique is used to capture high-dynamic data in several planes which are located in the wake and are perpendicular to freestream or parallel to the airfoil. The overall image of the flow field dynamics will be created using POD decomposition. Distinct flow patterns with associated kinetic energy are to be described as well as their role in the studied case. Existence of streamwise vorticity is proved, topology and other parameters are estimated in the paper; however related pressures and forces are not evaluated.

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On the global flow-field dynamics around an airfoil

Abstract: The global flow-field around an airfoil will be studied using time-resolved PIV technique. Interactions between pressure and suction sides flows will be studied in detail. Spanwise structures dynamics is to be analysed.

Cited by 2 publications

References 10 publications

Structure of the Wake Behind an Airfoil

Structure of the Wake Behind an Airfoil

Streamwise and spanwise vortical structure merging inside the wake of an inclined flat plate

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