TY - GEN
T1 - Amplification and structure of streamwise-velocity fluctuations in four shock-wave/turbulent boundary-layer interactions
AU - Mustafa, Muhammad A.
AU - Parziale, Nick J.
AU - Smith, Michael S.
AU - Marineau, Eric C.
N1 - Publisher Copyright:
© 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
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U2 - 10.2514/6.2018-3704
DO - 10.2514/6.2018-3704
M3 - Conference contribution
AN - SCOPUS:85051296801
SN - 9781624105531
T3 - 2018 Fluid Dynamics Conference
BT - 2018 Fluid Dynamics Conference
T2 - 48th AIAA Fluid Dynamics Conference, 2018
Y2 - 25 June 2018 through 29 June 2018
ER -