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Unstable vortices in the near region of an internal flow cavity (1989)

Isaacson, L. K. ; Denison, M. K. ; Crepeau, J. C.

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Publication Date: 2011-08-19

Description: This paper presents experimental data taken in the forward region of a separated internal free-shear layer produced in an internal cavity flowfield. It has been found that in the region very near the forward restrictor, experimental velocity profiles agree closely with the exact Stuart instability velocity profile with various values of a steepness parameter. Reynolds shear-stress profiles suggest the presence of counter-rotating longitudinal vortices. Spectral analysis by the maximum entropy method of the time samples within the vortices indicates subharmonic and harmonic components of the fundamental frequency, with a weak indication of the fundamental frequency itself.

Keywords: FLUID MECHANICS AND HEAT TRANSFER

Type: AIAA Journal (ISSN 0001-1452); 27; 1667-167

Format: text

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