Abstract
Flapping characteristics of jets from fluidic nozzles are investigated. These fluidic devices which produce oscillating flows consist of a slit and a rectangular duct. By means of flow visualization and velocity measurement, the optimal configuration for causing flapping jet is clarified. It is found that the flapping jet has a large spreading angle, and shows remarkable decay rate of mean velocity. It is also noticed that the frequency of the flapping jet depends on the configuration of the duct and the mean velocity at the slit. In addition, the deflection of flapping jet is revealed to be caused by the vortex in the rectangular duct.
