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Abstract
Dielectric-barrier-discharge (DBD) plasma actuators are all-electric devices with no moving parts. They are made of a simple construction, consisting only of a pair of electrodes sandwiching a dielectric sheet. When AC voltage is applied, air surrounding the upper electrode is ionized, which is attracted towards the charged dielectric surface to form a wall jet. Control of flow over land and air vehicles as well as rotational machinery can be carried out using this jet flow on demand. Here we review recent developments in plasma virtual actuators for flow control that can replace conventional actuators for better aerodynamic performance.
Highlights
Dielectric-barrier-discharge (DBD) plasma actuators are unique devices that are useful for flow control applications
We introduce a number of examples where plasma actuators can be used for flow control purposes in place of conventional actuators
When string-type DBD plasma actuators are attached to a metallic surface, the exposed electrode is unnecessary because the metallic surface can be used as an exposed electrode for plasma discharge
Summary
Dielectric-barrier-discharge (DBD) plasma actuators are unique devices that are useful for flow control applications. Wall is clearly seen around the actuator, while the wall-jet velocity profile becomes similar to that created from a two-dimensional nozzle. Unlike conventional actuators, such as pneumatic, hydraulic and electromagnetic actuators, DBD plasma actuators do not require any moving parts, such as valves, diaphragms, cylinders or gears, in order to activate them. DBD plasma actuators can be used to actively control the flow around vehicles, adapting to their operating conditions. They are much faster acting than any actuators currently available, which can be integrated well with hybrid and electric motor vehicles as well as future all-electric aircraft. Our examples include plasma vortex generators, plasma Gurney flaps, plasma travelling wave makers and plasma tip-clearance seals, there are many more potential plasma virtual actuators
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