Abstract
A new variant of a fluidic diode for hybrid synthetic jet actuators (HSJAs) is introduced in this paper, namely the diode in the form of a conical duct. The periodic jet flow from the diode impinges on the wall and the resulting flow differences during blowing and suction increase the volumetric efficiency of the actuator. Two alternative definitions of the volumetric efficiency are used. The HSJs velocities and volumetric efficiencies were experimentally evaluated. The experiments were performed using a phase-locked smoke visualization and hot-wire anemometry with air as the working fluid. The diode-to-wall distance and the driving frequency were varied, and the combination of parameters that provided the highest HSJ velocity and highest volumetric efficiency was obtained.
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