Abstract
The three-dimensional vortical structures in a rectangular jet were determined by measuring the phase-average fluctuating static pressure, and the characteristics of the structure were discussed. The experiments were carried out for an air jet issuing from a sharp-edged rectangular orifice. The jet was excited in the interaction mode, in which the stable interaction of vortices occurred. The phase-average pressure was measured over the flow field with a static pressure probe. The three dimensional contours of phase-average pressure provided useful information on complicated vortical structures. The structures were characterized by stretching, splitting and cut-and-connect of vortices. The results suggest that the direct measurements of fluctuating static pressure are very useful for detecting three-dimensional complicated vortical structures.
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