Abstract
The loss of stability of a flow resulting from the interaction of a transverse jet and a crossflow has been studied experimentally by means of several nonintrusive optical methods (Laser-Induced Fluorescence, Particle Streak Velocimetry). In particular, flow visualizations have allowed measurement of the characteristic velocity of rotation of a counter-rotating vortex pair, which is the prevailing system of this complex flow. It is shown that the elliptical geometry of the cross sections of these vortex structures can cause the loss of stability of the jet according to the theory of Landman and Saffman (1987). The unstable jet state is characterized by the generation of transverse unsteady rotating structures on the jet boundaries. These transverse eddies are clearly identifiable and their regularity of occurrence is satisfactorily explained by the theory of Landman and Saffman. Therefore, this study shows for the first time that the longitudinal structures must be taken into account in the mechanism of stability arising from the meeting of a jet and a cross stream.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 7 May 1997/Accepted: 20 March 1998
Rights and permissions
About this article
Cite this article
Blanchard, J., Brunet, Y. & Merlen, A. Influence of a counter rotating vortex pair on the stability of a jet in a cross flow: an experimental study by flow visualizations. Experiments in Fluids 26, 63–74 (1999). https://doi.org/10.1007/s003480050265
Issue Date:
DOI: https://doi.org/10.1007/s003480050265