Abstract
Synthetic jets are expected as an effective method of active boundary layer control. A synthetic jet device generates jets by vibrating the diaphragm of a speaker or a piezoelectric actuator by using a method of suction and blowing. The actuators are low power, zero-net-mass-flux and compact devices. Mixing enhancement is one of the key technologies in boundary layer control and it is necessary to control the behavior of vortex rings to promote mixing the crossflow and the boundary layer. The purpose of this study is to investigate the effect of vortex ring interaction due to differences in orifice distance (S=1.5D, 1.7D, 2.0D) on the behavior of vortex rings. In this experiment, the smoke flow visualization was used to describe the interaction process by changing the distance between adjacent orifices. It was confirmed that the height where two vortex rings collapse that in the case of S=2.0D was lower that in the case of S=1.5D.
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