L.M. Garcillan, S. Liddle, S. Zhong, N.J. Wood

For many years, synthetic jet actuators have been considered a viable method for active flow control. A lot of research has been carried out to study the characteristics of the structure of synthetic jets [1-5]. The interaction of synthetic jets with a boundary layer has also been investigated, producing the time-averaged characteristics of the boundary layer [4,6,7]. In this work, phase-locked measurements of the boundary layer with reference to the oscillatory motion of the actuator diaphragm were undertaken using a single hot wire probe, allowing the retention of the time information. Some revealing results about this interaction are presented and a model for the fluidic structures produced within the boundary layer is also proposed. One of the most interesting phenomena is the isolated structures appearing in the boundary layer and travelling at a convective speed very similar to that of the outer flow. Increasing the velocity ratio increases the distance of the structures to the wall, affecting less the lower part of the boundary layer hence decreasing their efficiency for flow control.

CEAS/KATnet Conference on Key Aerodynamic Technologies, Bremen, 2005

Conference Paper

englisch

21,0 x 29,7 cm, 8 Seiten

DGLR-Bericht, 2005, 2005-07, CEAS/KATnet Conference on Key Aerodynamic Technologies - Proceedings; S.1-8; 2005; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

in getr. Zählung;

aerodynamics

Bibliothek

2005