Effects of pulse energy on shear layer control using surface plasma discharges

David Akins, Ashish Singh, Jesse Little

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

The influence of pulse energy on nanosecond pulse driven dielectric barrier discharge (ns-DBD) plasma actuation applied to a turbulent shear layer downstream of a backward facing step (BFS) is examined experimentally. The ns-DBD control mechanism, which is believed to be primarily thermal in contrast to most other flow control actuators, has been demonstrated in various high speed shear flows yet questions on fundamental physics and scaling remain unanswered. In this work, ns-DBD pulse amplitude is varied between 0.13mJ/cm - 0.88mJ/cm per pulse in order to understand its effects on the excitation of a turbulent shear layer. This work is carried out at a fixed actuation frequency of 1000Hz which corresponds to Stθ=0.005. Both mean and phase-averaged data indicate a preference for the 0.33mJ/cm and 0.56mJ/cm pulse amplitudes. However, further analysis concludes that 0.33mJ/cm is most favorable as seen from momentum thickness growth and TKE distribution. It is unclear whether depreciating control authority for the highest pulse amplitude of 0.88mJ/cm is the result of increased plasma 3-dimensionality or some other thermal saturation mechanism.

Original languageEnglish (US)
Title of host publication45th AIAA Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103629
DOIs
StatePublished - 2015
Event45th AIAA Fluid Dynamics Conference, 2015 - Dallas, United States
Duration: Jun 22 2015Jun 26 2015

Publication series

Name45th AIAA Fluid Dynamics Conference

Other

Other45th AIAA Fluid Dynamics Conference, 2015
CountryUnited States
CityDallas
Period6/22/156/26/15

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Aerospace Engineering

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    Akins, D., Singh, A., & Little, J. (2015). Effects of pulse energy on shear layer control using surface plasma discharges. In 45th AIAA Fluid Dynamics Conference (45th AIAA Fluid Dynamics Conference). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2015-3344