The manipulation of an unstarting supersonic flow by plasma actuator

Seong Kyun Im, H. Do, M. A. Cappelli

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The manipulation of an unstarting supersonic flow is demonstrated using a dielectric barrier discharge (DBD). Experiments are carried out in a Mach 4.7 model inlet flow. Flow features, such as boundary layers and shockwaves at low freestream static pressure (1kPa) and temperature (60K) are visualized with Rayleigh scattering from condensed CO 2 particles. Flow unstart, initiated by mass injection, is studied for three model inlet flow configurations, distinguished by the initial conditions (untripped or tripped, plasma actuated or not) of the boundary layers. Unstart in the presence of thick, tripped boundary layers is characterized by the formation of an oblique unstart shock just upstream of a separating and propagating boundary layer. The presence of plasma actuation of this tripped boundary layer seems to arrest the boundary layer separation and leads to the formation of a quasi-stationary pseudo-shock, delaying unstart. The flow generated with DBD actuation is more characteristic of what is seen when unstart is generated in a model flow in which thin boundary layers grow naturally. Planar laser Rayleigh scattering visualizations suggest that the DBD actuation thins the tripped boundary layer over the exposed electrode region.

Original languageEnglish
Article number485202
JournalJournal of Physics D: Applied Physics
Volume45
Issue number48
DOIs
Publication statusPublished - 2012 Dec 5
Externally publishedYes

Fingerprint

supersonic flow
Supersonic flow
manipulators
boundary layers
Boundary layers
Actuators
actuators
Plasmas
actuation
inlet flow
Rayleigh scattering
Inlet flow
shock
boundary layer separation
static pressure
upstream
Carbon Monoxide
Mach number
low pressure
injection

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

The manipulation of an unstarting supersonic flow by plasma actuator. / Im, Seong Kyun; Do, H.; Cappelli, M. A.

In: Journal of Physics D: Applied Physics, Vol. 45, No. 48, 485202, 05.12.2012.

Research output: Contribution to journalArticle

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