In the field of fluid dynamics, the flow around bluff bodies has been studied extensively due to its relevance to engineering applications. Flow separation, wake formation, drag and lift forces are some of the crucial properties in a flow involving bluff bodies. Quite a number of studies have been conducted to analyze these parameters. The dynamics of vortex shedding along with a fluctuating velocity field also deserves equal importance. Vortex shedding dynamics lead to a number of different features such as flow induced vibrations, fluid mixing, heat transfer and noise generation. With respect to aerodynamic application, the intensity of vortex shedding and the size of vortices play an essential role in the generation of lift and drag forces from an airfoil. The flat plates are known to have a better lift-to-drag ratio than conventional airfoils at low Reynolds numbers (Re). A better understanding of the shedding behavior will help aerodynamicists implement flat plates at low Re specific applications such as fixed-wing Micro Air Vehicle. &nbsp;In the present study, the shedding of vortices behind a long flat plate inclined to an incoming flow stream has been studied experimentally in a low-speed subsonic wind tunnel at a Re of 5×104. The velocity field in the wake of the plate is measured using a hot wire anemometer. These measurements are taken at specific points which are varied in the vertical direction above the suction side of the flat plate. The velocity field is found to oscillate with one dominant frequency of fluctuation. The Strouhal number, calculated from this frequency, is computed for different angles of attack. The shedding frequency of vortices from the trailing edge of the flat plate has a general tendency to increase of incidence angle. The wake behind a flat plate is characterized by a symmetrical time averaged mean pattern, whereas the vortex shedding phenomena causes the instantaneous flow to be dominated by periodic coherent patterns. In this paper, the generation and subsequent shedding of leading edge and trailing edge vortices are discussed.

Vortex Shedding Analysis in the Wake of a Flat Plate  at Low Incidence and Low Reynolds Number

Paper Proceedings: https://asmedigitalcollection.asme.org/GTINDIA/GTINDIA2021/volume/85536

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