Experimental study of swept impinging oblique shock boundary layer interaction

Sathyan Padmanabhan, Jorge C. Maldonado, James A.S. Threadgill, Jesse C. Little

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

3 Scopus citations

Abstract

An experimental investigation has been conducted on swept impinging oblique shock/boundary layer interactions (SBLIs) at Mach 2.3. The incoming boundary layer is turbulent with (Reθ = 5.5 × 103). The swept impinging oblique shock is induced by a shock generator mounted in the freestream with x-y plane deflection angle θ = 12.5◦ and variable x-z plane sweep angles of 15.0◦, 22.5◦, 30.0◦, and 40.0◦. Oil flow visualization, particle image velocimetry (PIV), mean pressure measurements and fast-response pressure transducers are used to provide detailed characterization of the mean and unsteady features of the SBLIs. Large scale separation is observed in all cases with spanwise growth evident at high shock generator sweep angles. At the onset of separation in the quasi-infinite region, mean pressures are independent of span and scale cylindrically. However, mean pressures at reattachment display a mild dependency on the span, suggesting the global structure of the SBLIs is conical in nature. This agrees with supporting tomographic PIV measurements. Unsteady pressure measurements beneath the separation shock foot for the ψ = 30.0◦ SBLI shows clear low frequency unsteadiness across the span at nearly constant frequency. Spanwise travelling ripples are present at the shock foot with considerable coherence in the low frequency range. The spanwise convection speed of these ripples increases with span suggesting that the wavelength also increases. Minimal upstream influence is associated with the low frequency unsteadiness, suggesting a source mechanism within the SBLI.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
DOIs
StatePublished - Jan 1 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: Jan 7 2019Jan 11 2019

Publication series

NameAIAA Scitech 2019 Forum

Conference

ConferenceAIAA Scitech Forum, 2019
CountryUnited States
CitySan Diego
Period1/7/191/11/19

ASJC Scopus subject areas

  • Aerospace Engineering

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