Supersonic cavity response to open-loop forcing

David R. Williams, Daniel Cornelius, Clarence W. Rowley

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

13 Scopus citations


The response of a supersonic cavity to open-loop forcing with a pulsed-blowing actuator is explored experimentally. It is shown that excitation at frequencies near the Rossiter modes are amplified, while frequencies between the first two Rossiter modes are attenuated. The results clearly demonstrate that the Rossiter modes in the supersonic cavity are weakly damped (not self-excited) modes. The supersonic modes are not saturated, and do not show the kind of nonlinear interactions with the forcing modes observed in subsonic flow. These differences between supersonic and subsonic flows are consistent with previously developed models of cavity oscillations, and the results suggest that linear techniques for the design of closed-loop controllers may be particulary effective for supersonic flows. For the flow regime studied, the oscillatory component of open-loop forcing does not play a significant role in the suppression mechanism in supersonic cavity flows.

Original languageEnglish (US)
Title of host publicationActive Flow Control
Subtitle of host publicationPapers Contributed to the Conference Active Flow Control 2006
EditorsRudibert King
Number of pages14
StatePublished - 2007

Publication series

NameNotes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN (Print)1612-2909

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes


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