Vortex pairing and organized structures in axisymmetric jets under controlled excitationA description is given of experiments which have been carried out in a circular air jet facility consisting of two settling chambers in sequence. Sinusoidal perturbations in the exit profile are introduced at controlled frequencies and amplitudes with the aid of a loudspeaker attached to the wall of the first chamber. It was found that vortex pairing in circular jets can occur in two distinct modes, including the shear layer mode and the jet mode. Amplitude variations, the conditions for strong vortex pairing, and the spectral evolution downstream are illustrated with the aid of graphs.
Document ID
19770051005
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Zaman, K. B. M. Q. (Houston Univ. TX, United States)
Hussain, A. K. M. F. (Houston, University Houston, Tex., United States)