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INVESTIGATION OF THE LARGE SCALE STRUCTURES IN THE TURBULENT MIXING LAYER DOWNSTREAM A THICK PLATE

Laurent Perret
Laboratoire de Mecanique des Fluides, Ecole Centrale de Nantes, UMR CNRS 6598 1 rue de la Noe BP 92101, F-44321 Nantes Cedex 3, France

Joel Delville
Department of Fluid Flow, Heat Transfer and Combustion Institute Pprime - UPR 3346 - CNRS - Universite de Poitiers - ENSMA CEAT - F86036 Poitiers cedex, France

Jean-Paul Bonnet
Institut Pprime-Branche fluide Université de Poitiers 43 route de l'aérodrome,86000 Poitiers, France

Abstract

Experiments were performed in an incompressible plane mixing layer past a blunt trailing edge for a Reynolds number based on the splitter plate thickness of 0(104 ). The influence of the trailing edge geometry on the mixing layer development was investigated with two-point hot wire measurements which permit us to perform a Proper Orthogonal Decomposition (POD) of the flow. The blunt trailing edge wake was found to be responsible for a strong modification of the organization of the flow. Compared to a conventionnal mixing layer, the self-similar region was shifted downstream, the scale of the large structure are governed by the trailing edge thickness and all the statistical quantities such as the Reynolds stress profiles or the POD modes exhibit a streamwise evolution dominated by the wake characteristics over the mixing layer behaviour in the near region.