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VORTEX SHEDDING CHARACTERISATION IN A SHEAR LAYER WITH VARIABLE BOUNDARY CONDITIONS

DOI: 10.1615/ICHMT.1996.TransientConvHeatTransf.340

Frederic Plourde
Laboratoire d' Etudes Thermiques ENSMA, Site du FUTUROSCOPE, BP 109 86960 FUTUROSCOPE Cedex, France

Dominique Couton
Laboratoire d' Etudes Thermiques ENSMA, Site du FUTUROSCOPE, BP 109 86960 FUTUROSCOPE Cedex, France

Son Doan Kim
Laboratoire d' Etudes Thermiques ENSMA, Site du FUTUROSCOPE, BP 109 86960 FUTUROSCOPE Cedex, France

Abstract

The aim of this paper is to characterise the hydrodynamic development of a particular shear layer, created in the wake of an obstacle. An highly sheared flow can create periodic shedding vortices. Different boundary conditions have been tested in order to evaluate directly their influences on the shedding phenomenon. A fixed obstacle, creating the shear layer, has been studied and the response pressure data present clearly excitation of the first (250 Hz), the second (510 Hz) and the third (750 Hz) longitudinal modes. Two other different boundary conditions have been experimented : a flexible obstacle, offering a free vibration under flow field, and a variable and additional acoustic field. In the first case, the free vibration obstacle generates smaller energies of the acoustic modes, and in the second case, the additional acoustic field has entirely controlled the flow organisation.

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