Amplification and structure of streamwise-velocity fluctuations in four shock-wave/turbulent boundary-layer interactions

Muhammad A. Mustafa, Nick J. Parziale, Michael S. Smith, Eric C. Marineau

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

In this work, we study the effect of compression-corner angle on streamwise turbulent kinetic energy (sTKE) and structure in Mach 2.8 flow. Krypton Tagging Velocimetry (KTV) is used to investigate the incoming turbulent boundary layer and flow over 8°, 16°, 24° and 32° compression corners. The experiments were performed in a 99% N2 and 1% Kr gas mixture in the AEDC Mach 3 Calibration Tunnel (M3CT). A figure of merit is defined as the wall-normal integrated mean of the sTKE (sTKE) which is designed to identify turbulence amplification by accounting for the root-mean-squared (RMS) velocity fluctuations and shear-layer width for the different geometries. We observe that the sTKE increases as an exponential with compression-corner angle near the root when normalized by the boundary-layer value. Additionally, snapshot proper orthogonal decomposition (POD) is applied to the KTV results to investigate the structure of the flow. From the POD results, we extract the dominant flow structures and compare each case by presenting meanvelocity maps that correspond to the largest positive and negative POD mode coefficients. Finally, the POD spectrum reveals an inertial range common to the boundary-layer and each compression-corner flow that is present after the first ≈ 10 dominant POD modes.

Original languageEnglish
Title of host publication2018 Fluid Dynamics Conference
DOIs
StatePublished - 2018
Event48th AIAA Fluid Dynamics Conference, 2018 - Atlanta, United States
Duration: 25 Jun 201829 Jun 2018

Publication series

Name2018 Fluid Dynamics Conference

Conference

Conference48th AIAA Fluid Dynamics Conference, 2018
Country/TerritoryUnited States
CityAtlanta
Period25/06/1829/06/18

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