Effects of oscillating plates on the plane mixing layer, its developing region and jet were experimentally Investigated. The flow was formed by the jet issued from the two-dimensional nozzle and surrounding quiescent air. Two plates oscillate perpendicularly in relation to the main flow. Mean and fluctuating velocity components and Reynolds shear stress component were measured by hot-wire anemometers. With the disturbance of the plate, self-presevation was promoted and the width of the layer was enhanced. The transition process with the disturbance was enhanced by an interaction of the inherent periodic variation and the disturbance induced by the plate.
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