Turbulence structure of a compressible base flow with a central bleed jet

C. J. Bourdon, J. C. Dutton

Research output: Contribution to journalArticlepeer-review

Abstract

The turbulent structures present in the outer shear layer of an axisymmetric, compressible base flow with a central bleed jet are examined with a planar Mie-scattering imaging technique. The effects of bleed rate on the mean size, shape, and orientation of large-scale structures and the steadiness of the shear layer itself are quantified through the use of spatial correlation, shape factor, and steadiness analyses. This study demonstrates that the bleed fluid significantly influences the evolution of the turbulent structures in the outer shear layer. The presence of the bleed jet enforces symmetry on the flowfield and reduces turbulent-structure interaction across the centerline, significantly decreasing end-view centroidal fluctuations throughout the flowfield. Increased mass injection into the separated region and increased base pressure lead to spanwise-dominated mean turbulent structure statistics near the base. As the bleed flow rate is increased, the recompression shock system weakens, and the dramatic increase in structure size seen in the no-bleed case between the recompression and reattachment imaging positions becomes less prominent. The differences in turbulent structure size, shape, and orientation as a result of mass injection into the base region appear to vanish as the structures pass downstream into the developing wake region. In the absence of strong pressure gradients and streamline convergence effects, the surviving turbulent structures seem to have a preferred size and orientation that is dependent only on their proximity to the symmetry line of the wake.

Original languageEnglish (US)
Pages (from-to)451-460
Number of pages10
JournalJournal of Spacecraft and Rockets
Volume41
Issue number3
DOIs
StatePublished - 2004

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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