Open Access

ARTICLE

Spectral and wavelet analysis in the wake of an airfoil with Gurney flap

by

1 Computational Fluid Dynamics Group – National University of La Plata, La Plata, Argentina
2 National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina

Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería 2023, 39(1), 1-7. https://doi.org/10.23967/j.rimni.2023.03.001

Accepted 10 March 2023; Issue published 15 March 2023

Abstract

In this work we identify the coherent vortices in the leeward wake of an HQ 17 airfoil with a Gurney flap. This high-lift device consists of a small plate perpendicular to the airfoil, at or near the trailing edge, with a height H of the order from 1% to 4% of the chord. The overall effect is to produce a significant increase in lift, together with a relatively minor increase in airfoil drag. Its geometry generates vortex shedding of spatial scale H, which modulates the wake and thus influence the global configuration of the flow. A numerical study was performed with the commercial software ANSYS Fluent. Simultaneously, experiments were carried out in the wind tunnel of the Aeronautical Departmental Area from the Engineering School of the National University of La Plata. With a Dantec StreamLine hot-wire anemometer, records of the instantaneous horizontal and vertical velocity components in the airfoil wake were obtained. Both the experimental data and those obtained by numerical simulation were analyzed with the continuous wavelet transform technique, in order to identify and characterize the coherent vortices in the wake. Results show the shed vortices structure and the organization degree of this periodic shedding.

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Keywords

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