IEMN/LEMAC magneto-mechanical microjets and micro-hotwires and aerodynamic active flow control

摘要

An overview of the microjet and micro-hot wire solutions developed by IEMN/LEMAC during these last ten years for active flow control is presented. The IEMN/LEMAC microjet solutions are based on micro-magneto-mechanical systems (MMMS) and concern integrated devices delivering pulsed microjets, continuous microjets with bistable 'On-Off actuation, and synthetic microjets. These devices were combined in arrays of eight to 32 elements distributed near the leading edge of a physical model of air wing, within an engine blade, inside an S-duct, around an engine exhaust and at the rear end of an Ahmed car model. Several wind tunnel experiments were made for separation control, and aero-acoustic control. It was demonstrated that the microjets satisfied the functional specifications defined by the industrial partners, as well as good robustness in severe wind tunnel environments. In addition, MEMS micro-hot wires for very local flow characterisations were also developed.