Dresden 2017 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 33: Fluid Dynamics and Turbulence
DY 33.1: Talk
Wednesday, March 22, 2017, 10:00–10:15, ZEU 160
Characterization and optimization of devices for active flow control — •Max Huber1,3, Andreas Zienert2, Hans-Reinhard Berger1, and Jörg Schuster3 — 1Institute of Physics, Technische Universität Chemnitz, Chemnitz, Germany — 2Center for Microtechnologies, Technische Universität Chemnitz, Chemnitz, Germany — 3Fraunhofer Institute for Electronic Nano Systems, Chemnitz, Germany
Synthetic jet actuators (SJAs) are used for active flow control to achieve reduction of drag and noise as well as lift enhancement for airplane wings. The devices consist of a movable piezoelectric diaphragm and a closed cavity with a small orifice. The synthetic (i.e. zero net mass flux) jet is generated by the oscillation of the diaphragm and transfers momentum to the surrounding medium.
The present work studies a one dimensional analytical model for SJAs. The single parts of the actuator are described by a coupled set of mechanical and hydrodynamical equations. The model is used to analyse quantitatively the measured relation between diaphragm vibration and fluid flow through the orifice for different SJAs. In addition, an optimization of the cavity volume with respect to the resonance frequency of the diaphragm was carried out to maximize the performance of the device.