Publication

Nanosecond Pulsed Plasma Actuators

Christoph Hollenstein
2013
Journal Articles

Abstract

This paper summarizes the results of Plasmaero (EU project) partners on the characterization of plasma actuators based on nanosecond pulsed discharges. Results cover electrical aspects, optical discharge visualizations and measurements of the plasma-induced pressure wave, this for quiescent and transonic flow regimes. Among the results, this study demonstrates that the induced pressure wave is composed of over and under pressure of1600 and -600 Pa, respectively. In transonic regime, the capability of the discharge to produce a pressure wave remains but this one is convected by the freestream flow.

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https://infoscience.epfl.ch/entities/publication/7b81523b-872b-4159-b0d8-109255568d6a

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Christoph Hollenstein
2013
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/7b81523b-872b-4159-b0d8-109255568d6a

About this result

Related concepts (32)

Hypersonic speed

In aerodynamics, a hypersonic speed is one that exceeds five times the speed of sound, often stated as starting at speeds of Mach 5 and above. The precise Mach number at which a craft can be said to be flying at hypersonic speed varies, since individual physical changes in the airflow (like molecular dissociation and ionization) occur at different speeds; these effects collectively become important around Mach 5-10.

Transonic

Transonic (or transsonic) flow is air flowing around an object at a speed that generates regions of both subsonic and supersonic airflow around that object. The exact range of speeds depends on the object's critical Mach number, but transonic flow is seen at flight speeds close to the speed of sound (343 m/s at sea level), typically between Mach 0.8 and 1.2. The issue of transonic speed (or transonic region) first appeared during World War II. Pilots found as they approached the sound barrier the airflow caused aircraft to become unsteady.

Shock wave

In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance that moves faster than the local speed of sound in the medium. Like an ordinary wave, a shock wave carries energy and can propagate through a medium but is characterized by an abrupt, nearly discontinuous, change in pressure, temperature, and density of the medium. For the purpose of comparison, in supersonic flows, additional increased expansion may be achieved through an expansion fan, also known as a Prandtl–Meyer expansion fan.

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Nanosecond Pulsed Plasma Actuators

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