Characteristics of a dielectric barrier discharge plasma actuator driven by pulsed-DC high voltage

Abstract

Dielectric barrier discharge using pulsed-DC high voltage (pulsed-DC DBD) have been proven to be capable of effectively reducing skin friction drag in turbulent boundary layers with limited power consumption, thus producing significant net power savings. In this work, the characteristics of pulsed-DC DBD, including power consumption, induced flow structure, thermal effect, and body force, are investigated sequentially. Both the power consumption and pressure waves produced by pulsed-DC DBD are similar to that of DBD using nanosecond pulses (ns-DBD), whereas the wall-bounded jet structure resembles that of DBD using sinusoidal high voltage (ac-DBD). A curved wall jet is induced at a small pulse width, which turns into a straight one due to the combined effect of momentum and thermal addition when the pulse width increases. With increasing pulse width, the induced body force goes up while the thermal effect weakens. Although pulse frequency has no impact on the wall-bounded jet topology, the body force increases with pulse frequency because of the enhanced energy entrainment. With these results, four parameters that affect the performance of pulsed-DC DBD are extracted, including the pulse leading edge, pulse width, frequency, and amplitude, which lays the foundation for the optimization of pulsed-DC DBD.

Evaluating Discharge Performance and Catalytic Properties of Nanoscale Catalyst Dielectric Barrier Discharge System

“…The DBD system can be described using a simpli ed equivalent circuit, which represents the switching of different load phases within a single discharge cycle and reveals the basic relationships between capacitance parameters. The equivalent circuit has a wide range of applications [23] . Figure 4 shows the schematic diagram of the equivalent circuit for DBD.…”

“…Most studies on the coupling of DBD with catalyst have focused on the in uence of catalyst on ozone generation performance in the generator. However, in nanocatalyst-coupled DBD systems, the electrical properties of the catalyst, such as dielectric constant and capacitance, also impact the electric eld, discharge mode, and electron energy distribution in the discharge region [23][24][25] . Dielectric barrier discharge directly affects the characteristics of nanocatalysts, including changes in their surface morphology, structure, and elemental states, thereby in uencing the catalytic activity of the catalysts [26,27] .…”

Numerical simulation of streamer, pressure wave, and vortex induced by nanosecond pulsed surface dielectric barrier discharges

“…Although the simulation overestimates the vortex's strength, this outcome is still valuable for understanding the vortex formation and is worth discussing from a qualitative perspective. In related experimental studies, both shock waves and vortices have been observed when using pulsed discharges at frequencies ranging from hundreds to thousands of Hertz [29,30,60,61]. For instance, employing a repetitive frequency could enable a continuous input of EHD force, potentially yielding results comparable to those achieved with a constant force.…”

Electrical and aerodynamic characteristics of sliding discharge based on a microsecond pulsed plasma supply

“…Although the velocity of the induced jet is marginally lower than that of the millisecond plasma supply, the propagation speed of the shockwave is near that of the nanosecond plasma supply. The compound control effect has better flow control efficiency and has been successfully applied to UAV flight control [12,13]. At the same time, the energy consumption of the microsecond pulse plasma supply is lower than that of the millisecond plasma supply, and the electromagnetic interference is weaker, which is more suitable for engineering applications.…”