TU Darmstadt / ULB / TUbiblio

Pattern-Identification Study of the Flow in Proximity of a Plasma Actuator

Kriegseis, Jochen and Dehler, Tobias and Pawlik, Markus and Tropea, Cameron (2009):
Pattern-Identification Study of the Flow in Proximity of a Plasma Actuator.
In: AIAA-2009-1001; 47th AIAA Aerospace Science Meeting; Orlando, Florida, USA, [Conference or Workshop Item]

Abstract

In order to better understand transition delay using Dielectric Barrier Discharge (DBD) plasma actuators, investigations into the spatial velocity distribution produced by such an actuator in quiescent air have been performed. The velocity fields in the proximity of the actuator are obtained by means of particle image velocimetry (PIV). The experiments have been conducted for several electrode sizes, modulation frequencies and actuator voltages. In the vicinity of the upper electrode the existence of a recirculation zone and fluctuations that lead to instabilities in laminar boundary layers have been observed. Proper orthogonal decomposition (POD) is used to identify coherent structures in the flow and in the plasma itself. Flow patterns such as translatory and rotatory fluctuation modes superposed to the mean flow are thereby identified. Correlations between fluctuations of plasma intensity and velocity distribution are also identified. Topological analysis is used to convert the patterns into trajectories of singularities.

Item Type: Conference or Workshop Item
Erschienen: 2009
Creators: Kriegseis, Jochen and Dehler, Tobias and Pawlik, Markus and Tropea, Cameron
Title: Pattern-Identification Study of the Flow in Proximity of a Plasma Actuator
Language: English
Abstract:

In order to better understand transition delay using Dielectric Barrier Discharge (DBD) plasma actuators, investigations into the spatial velocity distribution produced by such an actuator in quiescent air have been performed. The velocity fields in the proximity of the actuator are obtained by means of particle image velocimetry (PIV). The experiments have been conducted for several electrode sizes, modulation frequencies and actuator voltages. In the vicinity of the upper electrode the existence of a recirculation zone and fluctuations that lead to instabilities in laminar boundary layers have been observed. Proper orthogonal decomposition (POD) is used to identify coherent structures in the flow and in the plasma itself. Flow patterns such as translatory and rotatory fluctuation modes superposed to the mean flow are thereby identified. Correlations between fluctuations of plasma intensity and velocity distribution are also identified. Topological analysis is used to convert the patterns into trajectories of singularities.

Title of Book: AIAA-2009-1001; 47th AIAA Aerospace Science Meeting; Orlando, Florida, USA
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Fluid Mechanics and Aerodynamics (SLA)
16 Department of Mechanical Engineering > Fluid Mechanics and Aerodynamics (SLA) > Dynamics of drops and sprays
UNSPECIFIED
Zentrale Einrichtungen
Date Deposited: 03 Sep 2010 11:04
Export:
Suche nach Titel in: TUfind oder in Google

Optionen (nur für Redakteure)

View Item View Item