Journal of Theoretical
and Applied Mechanics

35, 2, pp. 347-368, Warsaw 1997

The internal structure of the column-mode coherent vortex in free axisymmetric jet

Stanisław Drobniak, Janusz W. Elsner, El-Sayed Abou-El-Kassem
The description of the internal structure of coherent vortices existing in the initial region of a round free jet has been experimentally obtained by means of computer – aided signal processing techniques. It has been found that the coherent structures in the flow considered appear initially to be the classical potential vortices. At the next stages of structure development they are subject to complex deformations which influence the intensity of transport processes.
Keywords: turbulence; coherent structures; phase averaging