23rd Congress of International Council of the Aeronautical Sciences, 8-13 September, 2002, Toronto, Canada
Paper ICAS 2002-3.6.4

SPIRAL VORTICES DETECTION ON A ROTATING DISK

T. Astarita, G. Cardone, G. M. Carlamagno
University of Naples, Italy

Keywords: spiral vortices, rotating disk, ir thermography

The spiral vortices that arise in the transitional regime of the three-dimensional boundary layer on a rotating disk are experimentally investigated by means of Infrared (IR) Thermography. In order to detect the spiral vortices, which rotate attached to the disk surface, this latter one is uniformly heated with a printed circuit board and the line scan facility of the infrared system is used. A reconstruction of the thermal image, joined with an application software, allows for counting the number of vortices and their inclination as a function of the local Reynolds number.

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