Eur. Phys. J. B 16, 563-567 (2000)
https://doi.org/10.1007/s100510070217

Large scale correlations for energy injection mechanisms in swirling turbulent flows

¹ Laboratoire de Physique Statistique (CNRS, UMR 8550) , École Normale Supérieure, 24 rue Lhomond 75231 Paris Cedex 05, France
² Laboratoire de Physique (CNRS, UMR 5672) , École Normale Supérieure de Lyon, 46 allée d'Italie, 69364 Lyon Cedex 07, France

Corresponding author: ^a fauve@physique.ens.fr

Received: 2 September 1999
Published online: 15 August 2000

Abstract

We report an experimental study of large scale correlations in the power injected in turbulent swirling flows generated in the gap between two coaxial rotating disks. We measure the pressure fluctuations on the blades of one disk, as well as the pressure drop between the leading and the trailing edges of the rotating blades, i.e. the local drag force. Measurements at different positions on one blade and on two successive blades display a correlation length much larger than the ones usually expected in turbulent flows. The time lag for which the correlation between two points is maximum, strongly depends on the global flow configuration. These results help us to understand the statistical properties of the injected power fluctuations in turbulent swirling flows.