Author(s)

L. de Luca, G. Cardone & G.M. Carlomagno

Abstract

Computational Methods and Experimental Measurements 413 Experimental investigation on Goertler vortices in hypersonic flow L. de Luca, G. Cardone, G.M. Carlomagno ABSTRACT The Goertler instability of hypersonic boundary layer flow and its influence on the wall heat transfer are experimentally analysed. Measurements, made in a wind tunnel by means of a computerized infrared (IR) imaging system, refer to the flow over 2D concave walls as well as 2D and 3D wedge models in viscous interaction regime. Wall temperature maps (that are to be interpreted as surface flow visualizations) and heat transfer spanwise fluctuations are presented. Measured vortices wavelengths are correlated to non-dimensional parameters and compared with numerical predictions of literature. INTRODUCTION Instability of a fluid flow can occur in a homogeneous medium owing to the streamlines curvature, e.g. in the boundary layer developing over a

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