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Low-frequency unsteadiness of swept shock-wave/turbulent-boundary-layer interaction

Published online by Cambridge University Press:  11 October 2018

Xin Huang  and
David Estruch-Samper Open the ORCID record for David Estruch-Samper [Opens in a new window]
Xin Huang
Affiliation:
Department of Mechanical Engineering, National University of Singapore, 117575, Singapore
David Estruch-Samper*
Affiliation:
Department of Mechanical Engineering, National University of Singapore, 117575, Singapore
*
†Email address for correspondence: [email protected]
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Abstract

High-speed turbulent boundary-layer separation can lead to severe wall-pressure fluctuations, often extending over a swept shock region. Having noted the shear layer’s influence within axisymmetric step flows, tests go on to experimentally assess the unsteadiness of a canonical swept separation, caused by a slanted $90^{\circ }$-step discontinuity (with varying azimuthal height) over an axisymmetric turbulent boundary layer. Results document an increase in shock pulsation frequency along the swept separation region ($\unicode[STIX]{x1D6EC}\leqslant 30^{\circ }$ sweep angles) – whereby the recirculation enables downstream feedback via the reverse flow – as the local streamwise separation length is reduced. A link between the spanwise variation in the separation shock’s low-frequency instability and the downstream mass ejection rate, as large shear-layer eddies leave the bubble, is sustained. The local entrainment-recharge dynamics of swept separation are thereby duly evaluated.

JFM classification

Aerodynamics: Aerodynamics Boundary Layers: Boundary layer separation Aerodynamics: High-speed flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 856 , 10 December 2018 , pp. 797 - 821
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Copyright
© 2018 Cambridge University Press 

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References

Agostini, L., Larchevêque, L. & Dupont, P. 2015 Mechanism of shock unsteadiness in separated shock/boundary-layer interactions. Phys. Fluids 27, 126103.Google Scholar
Babinsky, H. & Harvey, J. K. 2011 Shock Wave–Boundary-Layer Interactions, Cambridge Aerospace Series. Cambridge University Press.Google Scholar
Brown, G. L. & Roshko, A. 1974 On density effects and large structures in turbulent mixing layers. J. Fluid Mech. 64, 775–781.Google Scholar
Brusniak, L. & Dolling, D. S. 1994 Physics of unsteady blunt-fin-induced shock wave/turbulent boundary layer interactions. J. Fluid Mech. 273, 375–409.Google Scholar
Chandola, G., Huang, X. & Estruch-Samper, D. 2017 Highly separated axisymmetric step shock-wave/turbulent-boundary-layer interaction. J. Fluid Mech. 828, 236–270.Google Scholar
Clemens, N. T. & Narayanaswamy, V. 2014 Low-frequency unsteadiness of shock wave/turbulent boundary layer interactions. Annu. Rev. Fluid Mech. 46, 469–492.Google Scholar
Délery, J. & Marvin, J. G. 1986 Shock wave/boundary layer interactions. AGARDograph 280, 1–216.Google Scholar
Dolling, D. S. 2001 Fifty years of shock-wave/boundary-layer interaction research: what next? AIAA J. 39 (8), 1517–1531.Google Scholar
Dupont, P., Haddad, C. & Debiève, J. F. 2006 Space and time organization in a shock-induced separated boundary layer. J. Fluid Mech. 559, 255–277.Google Scholar
Dussauge, J. P. & Piponniau, S. 2008 Shock/boundary-layer interactions possible sources of unsteadiness. J. Fluids Struct. 24, 1166–1175.Google Scholar
Erengil, M. E. & Dolling, D. S. 1993 Effects of sweepback on unsteady separation in Mach 5 compression ramp interactions. AIAA J. 31 (2), 302–311.Google Scholar
Estruch-Samper, D. & Chandola, G. 2018 Separated shear layer effect on shock-wave/turbulent-boundary-layer interaction unsteadiness. J. Fluid Mech. 848, 154–192.Google Scholar
Gaitonde, D. V. 2015 Progress in shock wave/boundary layer interactions. Prog. Aeronaut. Sci. 72, 80–99.Google Scholar
Guiho, F., Alizard, F. & Robinet, J. C. 2016 Instabilities in oblique shock wave/laminar boundary-layer interactions. J. Fluid Mech. 789, 1–35.Google Scholar
Humble, R. A., Scarano, F. & van Oudheusden, B. W. 2009 Unsteady aspects of an incident shock wave/turbulent boundary layer interaction. J. Fluid Mech. 635, 47–74.Google Scholar
Kubota, H. & Stollery, J. 1982 An experimental study of the interaction between a glancing shock wave and a turbulent boundary layer. J. Fluid Mech. 116, 431–458.Google Scholar
Laderman, A. J. 1980 Adverse pressure gradient effects on supersonic boundary-layer turbulence. AIAA J. 18, 1186–1195.Google Scholar
Morajkar, R. R., Klomparens, R. L., Eagle, W. E., Driscoll, J. F. & Gamba, M. 2016 Relationship between intermittent separation and vortex structures in a three-dimensional shock/boundary-layer interaction. AIAA J. 54 (6), 1862–1880.Google Scholar
Panaras, A. G. 1996 Review of the physics of swept-shock/boundary layer interactions. Prog. Aerosp. Sci. 32, 173–244.Google Scholar
Panaras, A. G. 1997 The effect of the structure of swept-shock-wave/turbulent-boundary-layer interactions on turbulence modelling. J. Fluid Mech. 338, 203–230.Google Scholar
Papamoschou, D. 1995 Evidence of shocklets in a counterflow supersonic shear layer. Phys. Fluids 7, 233–235.Google Scholar
Pasquariello, V., Hickel, S. & Adams, N. A. 2017 Unsteady effects of strong shock-wave/boundary-layer interaction at high Reynolds number. J. Fluid Mech. 823, 617–657.Google Scholar
Piponniau, S., Dussauge, J. P., Debiève, J. F. & Dupont, P. 2009 A simple model for low-frequency unsteadiness in shock-induced separation. J. Fluid Mech. 629, 87–108.Google Scholar
Poggie, J. & Leger, T. 2015 Large-scale unsteadiness in a compressible, turbulent reattaching shear layer. Exp. Fluids 56 (205), 1–12.Google Scholar
Priebe, S., Tu, J. H., Rowley, C. W. & Martin, M. P. 2016 Low-frequency dynamics in a shock-induced separated flow. J. Fluid Mech. 807, 441–477.Google Scholar
Sansica, A., Sandham, N. D. & Hu, Z. 2016 Instability and low-frequency unsteadiness in a shock-induced laminar separation bubble. J. Fluid Mech. 798, 5–26.Google Scholar
Souverein, L. J., Dupont, P., Debiève, J. F., Dussauge, J. P., van Oudheusden, B. W. & Scarano, F. 2010 Effect of interaction strength on unsteadiness in turbulent shock-wave-induced separations. AIAA J. 48 (7), 1480–1493.Google Scholar
Touber, E. & Sandham, N. D. 2011 Low-order stochastic modelling of low-frequency motions in reflected shock-wave/boundary-layer interactions. J. Fluid Mech. 671, 417–465.Google Scholar
Vanstone, L., Musta, M. N., Seckin, S. & Clemens, N. T. 2018 Experimental study of the mean structure and quasi-conical scaling of a swept-compression-ramp interaction at Mach 2. J. Fluid Mech. 841, 1–27.Google Scholar