Numerical and experimental investigation of electromagnetic separation control using different wave forms


Numerical and experimental investigation of electromagnetic separation control using different wave forms

Albrecht, T.; Weier, T.; Gerbeth, G.; Metzkes, H.; Stiller, J.

The separated flow around inclined airfoils can be controlled by unsteady actuation near the leading edge (LE), increasing the maximum lift coefficient without the need for heavy and complex high lift devices such as flaps. Zero net mass flow devices (ZNMF) are often used for this purpose. While certainly favorable for industrial application, actuation via ZNMF faces some problems. In particular, to independently control both amplitude and frequency of the excitation is considered a ``great challenge'' This is even more severe when the wave form of the actuation is non-sinusoidal, i.e., contains more than one frequency component. Lorentz forces do not suffer from such limitations; driven by an electric current, arbitrary wave forms can be generated easily. The main purpose here is to identify possibly different mechanisms triggered by different wave forms. In particular, we investigate electromagnetic excitation using a) a sinusoidal wave and b) rectangular waves at duty cycles of DC=1/4 and DC=1/8.

Keywords: flow control; Lorentz force

  • Lecture (Conference)
    5th AIAA Flow Control Conference, 28.06.-01.07.2010, Chicago, IL, USA

Permalink: https://www.hzdr.de/publications/Publ-13351
Publ.-Id: 13351