Aspects of shear layer unsteadiness in a three-dimensional supersonic wake

Alan L. Kastengren, J Craig Dutton

Research output: Contribution to journalArticlepeer-review


The near wake of a blunt-base cylinder at 10° angle-of-attack to a Mach 2.46 free-stream flow is visualized at several locations to study unsteady aspects of its structure. In both side-view and end-view images, the shear layer flapping grows monotonically as the shear layer develops, similar to the trends seen in a corresponding axisymmetric supersonic base flow. The interface convolution, a measure of the tortuousness of the shear layer, peaks for side-view and end-view images during recompression. The high convolution for a septum of fluid seen in the middle of the wake indicates that the septum actively entrains fluid from the recirculation region, which helps to explain the low base pressure for this wake compared to that for a corresponding axisymmetric wake. copyright

Original languageEnglish (US)
Pages (from-to)1085-1094
Number of pages10
JournalJournal of Fluids Engineering, Transactions of the ASME
Issue number6
StatePublished - Nov 1 2005
Externally publishedYes

ASJC Scopus subject areas

  • Mechanical Engineering


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