Lift improvement usign piezoelectric actuator

Abstract

This paper deals with the determination of the lift improvement of plane winy using pulsed jets generated by piezoelectric actuators. This actuator is constituted by a large bimorph constituted by piezoelectric patches cemented on a brass plate. The bimorph is inserted into a rigid case and one of the long edge plate is clamped the other is free. An alternating voltage is applied to the piezoelectric patches inducing the bending of the brass plate which opens and closes a 100 x 1 mm2 slit. Due to the internal static pressure pulsated jets arc formed and escape the slit. This actuator is inserted into a particular wing profile in order to measure the pressure modifications induced by the jets and the corresponding lift improvements are deduced. The best functioning conditions of the actuator and the lift improvement are determined and discusse