Electric wind produced by sliding discharges

A DEBIEN; R SOSA; N BENARD; E MOREAU

Congreso; New electrical Technologies for environment 2nd ISNPEDADM; 2011

Surface dielectric barrier discharges (DBD) used for airflow control are investigated by force measurements and time-averaged particle image velocimetry. Three types of plasma actuators are studied: a typical single DBD based on two electrodes flush mounted on both sides of a dielectric plate, an extended DBD that uses a third electrode supplied by a positive dc voltage and a sliding discharge with a negative dc voltage. On one hand, results show that the extended DBD allows us to increase slightly the body force and the produced velocity. On the other hand, in the case of a sliding discharge, and only if the negative dc voltage is well adjusted compared to the ac sine high voltage, there is a significant enhancement of the force. Moreover, the electric wind velocity is increased and its topology is strongly modified, resulting in a more intense suction effect above the discharge.