Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Poster - Turbulence
DY 32.3: Poster
Dienstag, 8. März 2016, 18:15–21:00, Poster C
Modelling of a coupled mechanical-hydrodynamic system for 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
Reduction of drag and noise as well as lift enhancement for airplane wings can be achieved with actice flow control, using synthetic jet actuators (SJA). These devices consist of a closed cavity with a small orifice and a movable piezoelectric diaphragm. The oscillation of the diaphragm generates the synthetic (i.e. zero net mass flux) jet that transfers momentum to the surrounding medium.
The present work introduces an analytical model to study the interaction between the driving force of the SJA, the pressure inside the cavity and the flow velocity through the orifice. For this purpose, the oscillating diaphragm is treated as a spring pendulum. Fundamental equations from hydrodynamics describe the flow of the fluid.
Besides, simulations based on finite element method (FEM) were carried out to solve the Navier-Stokes equations. While the straightforward analytical approach describes pressure and flow velocitiy in the SJA and its orifice, FEM shows the train of vortices outside the SJA which is the cause of the momentum flux.