Abstract
A new concept of electrode shape and arrangement is proposed to develop a multi-stage plasma synthetic jet actuator for the low-voltage operation. Exposed and covered electrodes, which have complicated shapes due to electrical wiring to the inner side of annular electrodes, are fabricated by an inkjet printing process using a silver nanoparticle-based ink. The plasma synthetic jet actuator developed in this study can be operated at 1000 V or lower. The discharge spreads uniformly from only the inner side of each annular electrode, inducing a unidirectional ionic wind toward the center of the coaxial electrode circle. Particle image velocimetry measurements reveal that the wall-normal jet induced by the multi-stage plasma synthetic jet actuator can be characterized as an axisymmetric free shear flow. The electrical and mechanical characteristics are similar to the linear-type dielectric-barrier-discharge plasma actuators. We also demonstrate that the printed electronics technique is suitable for the generation of arbitrary electrode shapes and arrangements and hence is a powerful tool for the realization of industrial applications of active airflow control devices using atmospheric pressure discharge.
Highlights
Dielectric barrier discharges (DBDs) at atmospheric pressure are commonly used in a wide range of practical applications such as agriculture,1 sterilization,2 and surface modification3 since nonequilibrium plasmas are obtained without a vacuum chamber
We have designed the shape and arrangement of the electrode for the multi-stage plasma synthetic jet actuator and demonstrated that the developed actuator induces the axisymmetric free shear flows as the single-stage plasma synthetic jet actuator
The applied direct current (DC) voltage of the plasma synthetic jet actuator was reduced to 1000 V or lower owing to the multi-staging of the actuator modules
Summary
Dielectric barrier discharges (DBDs) at atmospheric pressure are commonly used in a wide range of practical applications such as agriculture, sterilization, and surface modification since nonequilibrium plasmas are obtained without a vacuum chamber. A large number of studies are devoted to the development of a next-generation active airflow-control device referred to as DBD plasma actuators.. A typical DBD plasma actuator consists of two electrodes and a dielectric, forming a surface discharge along the dielectric surface by applying a high alternating current (AC) voltage. The charged particles generated by the surface discharge transport their momenta through collision, inducing ionic wind parallel to the dielectric surface (electrohydrodynamic: EHD effect). The DBD plasma actuators can actively control the airflow without any moving parts and are advantageous owing to their fast response. Numerous studies have demonstrated that the DBD plasma actuator mitigates separating flow around an airfoil.. Many studies address the performance improvement of the DBD plasma actuator and focus on clarifying the mechanism of the EHD force generation process using numerical simulations.
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