プラズマアクチュエータを用いた乱流境界層内における人工大規模構造の生成

抄録

A plasma actuator is applied to generate an artificial Super Structure in the turbulent boundary layer. The large scale streamwise vortical motion is produced by the two planar jets collision which is driven by actuators. The multi-point streamwise velocities in the logarithmic region are measured by using a Rake with a span-wise array of 9 channel I-type hot wire. It is found that the mean velocity with plasma actuator is slower than without plasma actuator. The mean velocity decreases as the applied voltage of actuator becomes larger. It may be an effect by the vertical flow induced by the actuators, i.e., the low-speed fluid is brought up from the near-wall region. This result shows that there is a possibility that an artificial Super Structure is successfully generated in the turbulent boundary layer.