Visualizations and measurements of axisymmetric base flows altered by surface disturbances

C. J. Bourdon, J. C. Dutton

Research output: Contribution to conferencePaperpeer-review

Abstract

The effects that sub-boundary layer disturbances have on the near-wake turbulence structure in a reattaching, compressible, axisymmetric flow are examined. Both delta-shaped and axisymmetric-strip disturbances are examined. The effect that the number and thickness of delta-shaped tabs and the placement of axisymmetric strip tabs have on the base pressure is quantified. These pressure data show that delta-shaped disturbances can generate a base pressure decrease of up to 10%, while strip disturbances can generate a base pressure increase of up to 3%. Planar visualizations in both the side and end views were obtained for key tab arrangements using Rayleigh/Mie scattering of condensed ethanol droplets. These visualizations show that each delta-tab generates a streamwise counter-rotating vortex pair, which is easily identifiable in average images, through the mean reattachment point. The strip-tab configuration generates increased symmetric shear layer motion and large, circumferentially eccentric mean end-view structures near the base. Both of these effects are quickly damped because of the high convective Mach number in the initial portion of the shear layer.

Original languageEnglish (US)
DOIs
StatePublished - 2001
Event39th Aerospace Sciences Meeting and Exhibit 2001 - Reno, NV, United States
Duration: Jan 8 2001Jan 11 2001

Other

Other39th Aerospace Sciences Meeting and Exhibit 2001
CountryUnited States
CityReno, NV
Period1/8/011/11/01

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

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