How plasma actuators affect flow in bursts and steady mode

What is it about?

Plasma actuators are devices that use electrically charged gas, called plasma, to gently push or steer airflow without moving parts. In this study, we explored a special type of plasma actuator that uses both alternating current (AC) and direct current (DC) to generate a more powerful, controllable “electric wind.” We compared two ways of powering it: continuously (always on) and in bursts (rapidly switching on and off). Our experiments showed that the airflow generated by the actuator passes through distinct stages: first, a swirling vortex forms; then, complex interactions develop between opposing flows; finally, a steady, angled jet emerges. When powered in bursts, especially at specific frequencies, the actuator reaches its effective flow-control state faster than when left on continuously. It could make burst-mode operation more efficient for real-world applications, such as reducing drag on aircraft or managing shock waves in high-speed flight. In simple terms: think of the plasma actuator as an invisible “fan” made of electricity. By pulsing it smartly rather than running it nonstop, we can better control air movement—quickly and with less energy.

Featured Image

Photo by John Doyle on Unsplash

Photo by John Doyle on Unsplash