Recompression shock unsteadiness in supersonic blunt-base cylinder wakes

Alan L. Kastengren, J. C. Dutton, Gregory S. Elliott

Research output: Contribution to conferencePaperpeer-review

Abstract

A study of the unsteadiness in the position and angle of the recompression shock in supersonic blunt-body cylinder wakes at 0° and 10° angle-of-attack has been undertaken. The shock is visualized by planar Mie scattering, allowing the position of the shock to be determined instantaneously over a wide region of the flow. The recompression shock at 0° angle-of-attack is highly branched, with generally low values indicated for the density gradient across the shock. The shock is much more easily visualized at α=10°, with far less branching. The behavior of the angle-of-attack shock system shows significant variation with circumferential location. In the windward and lateral parts of the wake, the shock has many curved sections, which are often associated with large-scale turbulent structures. The leeward shock system is more stable and linear. The standard deviation in the shock position measured normal to the shock ranges from 10-13% of the base radius for the axisymmetric wake to 1-4% of the base radius for the angle-of-attack wake, with significant differences between the different planes of the angle-of-attack wake. Correlation analysis for the α=10° case indicates that fluctuations in the shock position tend to be correlated over relatively long streamwise distances. Analysis of the shock angle for the angle-of-attack wake shows a significant variation in the local angle of the shock, with the trends for the unsteadiness in the local shock angle paralleling those seen for the unsteadiness in the shock position.

Original languageEnglish (US)
Pages12147-12159
Number of pages13
StatePublished - Dec 1 2005
Event43rd AIAA Aerospace Sciences Meeting and Exhibit - Reno, NV, United States
Duration: Jan 10 2005Jan 13 2005

Other

Other43rd AIAA Aerospace Sciences Meeting and Exhibit
CountryUnited States
CityReno, NV
Period1/10/051/13/05

ASJC Scopus subject areas

  • Engineering(all)

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