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We show that the spatio-temporal ElectroHydroDynamic (EHD) force productionin surface AC-Dielectric Barrier Discharge (AC-DBD) actuators is stronglyinfluenced by both the streamer regime during the positive phase and themicro-discharge regime during the negative phase. Focusing on the spatial EHDforce profiles, we demonstrate that the ionic wind spatial distribution canonly be explained by the positive contribution of the streamer regime. Thelocation of maximum ionic wind is found to be directly linked with the maximumelongation of the streamers at several millimeters from the exposed electrode.In both positive and negative phases of the AC-DBD operation, residualvolumetric and surface charges once again linked to the streamer formation andafterburn, result to a variety of positive EHD force zones which, whentime-averaged in one AC period, contribute to the generation of theexperimentally observed induced thin wall jet. Through a thorough elaborationof our numerical results, we provide an illustrative explanation of the EHDforce spatio-temporal evolution, showcase the importance of streamers andretrieve a correct representation of the ionic wind spatial profiles whencompared to experiments.

The ElectroHydroDynamic force distribution in surface AC Dielectric Barrier Discharge actuators: do streamers dictate the ionic wind profiles?