Feasibility study of flow control by dynamic vane vortex generators based on piezoceramic actuators


Feasibility study of flow control by dynamic vane vortex generators based on piezoceramic actuators

Barth, T.; Scholz, P.; Wierach, P.

This investigation is an fundamental study about the perfomance of dynamic operated solid/mechanical vane vortex generators (VVGs). Fluidic vortex generators or so called vortex generator jets (VGJs) are more efficient in dynamic operation. Thus, the scope is to explore if VVGs are superior in dynamic operation, too. Besides, the influence of higher frequencies will be observed. The motion of the VVGs is generated by piezoceramic actuators or so called Marco Fiber Composites (MFC).The MFC actuators consist of bimoporh carbon fibre bars with applied piezoceramic face actuators on the top and downside. These MFC actuators generate a sinusoidal motion of the VVGs and were designed by analytical and experimental investigations. The MFC actuators are operated in resonance to gain the required displacement. Mass clamps applied on the bar tune the eigenfrequency into the operating point. Both, VVGs and MFC actuators, will bei integrated into a flat plate in a low speed wind tunnel. The VVGs penetrate through small plastic slits into a turbulent boundary layer. A stereo PIV system will record phase locked flow field pictures. The transient formation of the position and circulation of the vortex centers states that dynamic operated VVGs are supiror to static VVGs.

Keywords: vortex generator; Stereo PIV; active flow control; turbulent boundary layer

Permalink: https://www.hzdr.de/publications/Publ-15030
Publ.-Id: 15030