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Investigation of Flow Separation Control by Nanosecond Pulsed Dielectric Barrier Discharge Actuators

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Industrial plasmas in academia

Christoph Hollenstein, Ivo Furno, Alan Howling, Philippe Frédérique Bruno Guittienne

The present review, written at the occasion of the 2014 EPS Innovation award, will give a short overview of the research and development of industrial plasmas within the last 30 years and will also provide a first glimpse into future developments of this i ...

Iop Publishing Ltd2015

Understanding SDBD Actuators: An Experimental Study on Plasma Characteristics

Pénélope Leyland, Gennady Plyushchev

The working mechanisms of surface dielectric barrier discharge (SDBD) plasma actuators foreseen as aerodynamic control devices is investigated experimentally on a common platform, referred to as the NATO-AVT-RTO-190 test case. A better understanding of the ...

2014

Investigation of Flow Separation Control by Nanosecond Pulsed Dielectric Barrier Discharge Actuators

Peter Ott, Pénélope Leyland, Philip Peschke, Nadia Grech

The ability of nanosecond pulsed DBD actuators to control flow separation was investigated on a NACA 0015 profile for velocities reaching Re = 230,000 (24 m/s). The optimal location for the actuator was determined from oil flow experiments. Moderate voltag ...

2013

Frequency-stepped acquisition in nuclear magnetic resonance spectroscopy under magic angle spinning

David Lyndon Emsley

The nuclear magnetic resonance of paramagnetic solids is usually characterized by the presence of large chemical shifts and shift anisotropies due to hyperfine interactions. Frequently the resulting spectra cover a frequency range of several megahertz, whi ...

AMER INST PHYSICS2013

Hybridization of wave functions in one-dimensional localization

Dmitri Ivanov

A quantum particle can be localized in a disordered potential, the effect known as Anderson localization. In such a system, correlations of wave functions at very close energies may be described, due to Mott, in terms of a hybridization of localized states ...

2012

Amplitude and frequency are the two primary features of one-dimensional signals, and thus both are widely utilized to analysis data in numerous fields. While amplitude can be examined directly, frequency requires more elaborate approaches, except in the si ...

EPFL2012

In this communication we propose the concept of a circularly polarized reflectarray (RA) antenna capable of independent beam-switching in both K and Ka bands. The RA unit cell comprises one microstrip ring per each operation frequency. Each ring is integra ...

Institute of Electrical and Electronics Engineers2012

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A planar antenna operating at 13.56MHz is presented for potential applications in plasma processing. It consists of interconnected elementary resonant meshes composed of inductive and capacitive elements. Due to its structure, the antenna exhibits a set of ...

2012

Turbulence and bias-induced flows in simple magnetized toroidal plasmas are explored with global three-dimensional fluid simulations, focusing on the parameters of the Helimak experiment. The simulations show that plasma turbulence and transport in the reg ...

2011

Aero Engine Flow Control by Surface Discharge Plasma

Christoph Hollenstein, Peter Ott, Pénélope Leyland, Philip Peschke, Sami Goekce

Experimental investigations and numerical modeling with the objective to study the effects that surface discharge plasmas can provoke on aerodynamic flow situations, including high speed flows present in aero-engines, are undertaken at EPFL. The actuator’s ...

2010