Effect of sweep on the mean and unsteady structures of impinging shock/boundary layer interactions

Adam C. Doehrmann, Sathyan Padmanabhan, James A.S. Threadgill, Jesse C Little

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


An experimental investigation has been conducted to assess the effect of sweep on impinging oblique Shock/Boundary Layer Interactions (SBLIs), specifically focused on the distribution of mean and fluctuating pressure signatures at the wall. Four shock generators are utilized with x-y plane deflection of θ = 12.5, and x-z plane sweep angles of 15.0, 22.5, 30.0, and 40.0. The induced swept oblique shocks impinge upon the naturally turbulent Mach 2.3 boundary layer along the tunnel floor (Reθ ≈ 5000). The resultant SBLIs all exhibit significant separation, with a structure that grows in the spanwise direction. Flow features are assessed using oil-flow visualization, static pressure tapings, and fast-response pressure transducers. The rise in mean pressure near separation scales locally with cylindrical similarity suggesting the three-dimensional separation along the span obeys Free Interaction Theory. Local reattachment behavior is only mildly dependent upon span, yet the overall shock structure is clearly conical. Low-frequency unsteadiness is observed beneath the separation shock foot in all cases, shifting towards higher frequencies as sweep is increased. Spanwise ripples in the separation shock attributed to the low-frequency wall-pressure signature travel along the shock span with velocities an order of magnitude below that of the freestream flow. Results offer a vital insight into characterizing swept SBLI behavior in a fundamental configuration that has been largely overlooked in literature.

Original languageEnglish (US)
Title of host publicationAIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105241
StatePublished - Jan 1 2018
EventAIAA Aerospace Sciences Meeting, 2018 - Kissimmee, United States
Duration: Jan 8 2018Jan 12 2018


OtherAIAA Aerospace Sciences Meeting, 2018
CountryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering

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    Doehrmann, A. C., Padmanabhan, S., Threadgill, J. A. S., & Little, J. C. (2018). Effect of sweep on the mean and unsteady structures of impinging shock/boundary layer interactions. In AIAA Aerospace Sciences Meeting (210059 ed.). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2018-2074