Pressure dependency on a nanosecond pulsed dielectric barrier discharge plasma actuator

Wojewodka, M. M., White, C. , Ukai, T., Russell, A. and Kontis, K. (2019) Pressure dependency on a nanosecond pulsed dielectric barrier discharge plasma actuator. Physics of Plasmas, 26(6), 063512. (doi:10.1063/1.5092703)

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Abstract

The behavior of a nanosecond pulsed dielectric barrier discharge (ns-DBD) plasma actuator with the ambient pressure from 30 to 100 kPa was characterized with Schlieren images. Shock wave propagation speed and strength were recorded, showing clear trends with decreasing ambient pressure. Higher ambient pressures result in stronger shock waves; this has been observed irrespective of the actuator thickness. This might be explained with fewer air molecules to ionize at lower ambient pressures and hence a lower temperature from the exothermal recombination reactions. The thickness of the dielectric barrier also influences the shock strength. In accordance with previous findings, it was confirmed that a thinner dielectric barrier results in a greater shock strength. NS-DBD shock waves were modeled numerically using OpenFOAM through a source term added to the energy equation, which controls the amount of thermal energy added to the near-wall deposition region. The compressible, unsteady sonicFoam solver was used with second order schemes. A mesh sensitivity study gives confidence that the solution is grid independent. The overall shock wave structure and propagation speed match well with experimental data. The heat addition required to reproduce experimental results varied with ambient pressure. Less heating of the near-wall region was needed with lower ambient pressures.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wojewodka, Mr Michael and White, Dr Craig and Kontis, Professor Konstantinos and Ukai, Dr Takahiro
Authors: Wojewodka, M. M., White, C., Ukai, T., Russell, A., and Kontis, K.
College/School:College of Science and Engineering > School of Engineering > Aerospace Sciences
Journal Name:Physics of Plasmas
Publisher:AIP Publishing
ISSN:1070-664X
ISSN (Online):1089-7674
Published Online:18 June 2019
Copyright Holders:Copyright © 2019 The Authors
First Published:First published in Physics of Plasmas 26(6):063512
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
679091QT-EPSRC: QT DemonstratorGiles HammondEngineering and Physical Sciences Research Council (EPSRC)EP/M506539/1S&E P&A - PHYSICS & ASTRONOMY
678901EPSRC DTG 2014Mary Beth KneafseyEngineering and Physical Sciences Research Council (EPSRC)EP/M506539/1R&I - RESEARCH STRATEGY & INNOVATION
647261National Wind Tunnel FacilityFrank CotonEngineering and Physical Sciences Research Council (EPSRC)EP/L024888/1VPO (ACADEMIC & EDUCATIONAL INNOVATION)

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