Experimental study and plasma control of an unstarting supersonic flow

Seong kyun Im, Hyungrok Do, M. Godfrey Mungal, Mark A. Cappelli

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

6 Citations (Scopus)


The unstart induced by a transverse jet in a Mach 4.7 model inlet flow is visualized by planar laser scattering from condensed CO2 particles at low freestream static pressure (1kPa) and temperature (60K) for various boundary layer conditions. We find that the formation of an unstart shock is initiated on the relatively thick boundary layer side and its structure depends on the boundary layer conditions. The pseudo-shock or oblique shocks that precede unstart propagate upstream in symmetric and asymmetric boundary layer conditions, respectively. It is found that the pseudo-shock has a quasi-stationary mode resulting in longer overall unstart events. The results suggest that the unstart process can be influenced and possibly delayed by the control of the boundary layer conditions. In this paper, we present preliminary results on boundary layer manipulation of an unstarting supersonic flow using Dielectric Barrier Discharge (DBD) actuation. We find that the asymmetric boundary layer condition that generally leads to the formation and propagation of an oblique unstart shock, when actuated, can be transformed the flow to resemble that of a symmetric condition which leads to the generation of a pseudo-shock, extending the unstart duration by 22 %.

Original languageEnglish
Title of host publication6th AIAA Flow Control Conference 2012
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781624101885
Publication statusPublished - 2012
Externally publishedYes
Event6th AIAA Flow Control Conference 2012 - New Orleans, LA, United States
Duration: 2012 Jun 252012 Jun 28

Publication series

Name6th AIAA Flow Control Conference 2012


Conference6th AIAA Flow Control Conference 2012
Country/TerritoryUnited States
CityNew Orleans, LA

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Aerospace Engineering
  • Control and Systems Engineering


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