Abstract
In this paper, the oscillating jet flow in a slit-edge system is experimentally investigated during an edge tone operation. The experiment throws a light upon the relation between the pressure gradient and the deflection of the oscillating jet in the vicinity of the edge, upon streak lines and path lines of the jet center and upon the direction of the jet flow near the edge.
Experimental results are summerized as follows:
(1) In the vicinity of the edge, the phase angle of the pressure gradient across the oscillating jet advances about 80 degrees to that of the jet deflection independent of the slit-edge distance and the mean velocity of the jet.
(2) The pressure force acting on the jet depends on not only the jet deflection but also the flow direction of the jet in the vicinity of the edge.
(3) The oscillating pressures in the same side of the jet center line are in phase, but those of the opposite side are out of phase.
