The use of triangular shaped piezoceramic actuators in the near-wall region of turbulent shear flows is described. These actuators are very thin so that they can be flush mounted on the wall which greatly simplifies their application. The piezoceramic material was driven by an oscillating voltage that produced a mechanical deformation of the actuator. The magnitude of the deformation, and thus the amplitude of the disturbance, depended upon the voltage and geometry of the actuator. The forcing frequency was sufficiently high that the temporal aspect of the disturbance was rapidly dissipated. Measurements of the streamwise velocity component document the spatial extent of the perturbation.
Experiments in Fluids – Springer Journals
Published: Jun 6, 2000
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