RÉSUMÉ

A correlation analysis of simultaneous measurements of velocity fluctuations taken by laser-doppler-anemometry (LDA), and of fluctuations of smoke tracer concentration measured with the aid of computer-aided visualization in selected segments of a turbulent flow field over a back-facing step was performed. In this article, results indicate that the two different techniques used, LDA for the velocity fluctuations and computer-aided visualization for the concentration measurements, provide accurate values when they are synchronized and analyzed separately. Simultaneous association of these two techniques allows us to determine the velocity-concentration correlations. The presented relationship between velocity and concentration fluctuations expresses fairly good agreement of both measured quantities.