caa a22 4500 606197907 CHVBK 20210128100931.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00348-015-1924-8 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1924-8 Mitigation of wind tunnel wall interactions in subsonic cavity flows [Elektronische Daten] [Justin Wagner, Katya Casper, Steven Beresh, John Henfling, Russell Spillers, Brian Pruett] The flow over an open aircraft bay is often represented in a wind tunnel with a cavity. In flight, this flow is unconfined, though in experiments, the cavity is surrounded by wind tunnel walls. If untreated, wind tunnel wall effects can lead to significant distortions of cavity acoustics in subsonic flows. To understand and mitigate these cavity-tunnel interactions, a parametric approach was taken for flow over an L/D=7 cavity at Mach numbers 0.6-0.8. With solid tunnel walls, a dominant cavity tone was observed, likely due to an interaction with a tunnel duct mode. An acoustic liner opposite the cavity decreased the amplitude of the dominant mode and its harmonics, a result observed by previous researchers. Acoustic dampeners were also placed in the tunnel sidewalls, which further decreased the dominant mode amplitudes and peak amplitudes associated with nonlinear interactions between cavity modes. This indicates that cavity resonance can be altered by tunnel sidewalls and that spanwise coupling should be addressed when conducting subsonic cavity experiments. Though mechanisms for dominant modes and nonlinear interactions likely exist in unconfined cavity flows, these effects can be amplified by the wind tunnel walls. © Springer-Verlag (outside the USA), 2015 Wagner Justin Sandia National Laboratories, 87185, Albuquerque, NM, USA aut Casper Katya Sandia National Laboratories, 87185, Albuquerque, NM, USA aut Beresh Steven Sandia National Laboratories, 87185, Albuquerque, NM, USA aut Henfling John Sandia National Laboratories, 87185, Albuquerque, NM, USA aut Spillers Russell Sandia National Laboratories, 87185, Albuquerque, NM, USA aut Pruett Brian Sandia National Laboratories, 87185, Albuquerque, NM, USA aut Experiments in Fluids Springer Berlin Heidelberg 56/3(2015-03-01), 1-12 0723-4864 56:3<1 2015 56 348 https://doi.org/10.1007/s00348-015-1924-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1924-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wagner Justin Sandia National Laboratories, 87185, Albuquerque, NM, USA aut NATIONALLICENCE 700 1- Casper Katya Sandia National Laboratories, 87185, Albuquerque, NM, USA aut NATIONALLICENCE 700 1- Beresh Steven Sandia National Laboratories, 87185, Albuquerque, NM, USA aut NATIONALLICENCE 700 1- Henfling John Sandia National Laboratories, 87185, Albuquerque, NM, USA aut NATIONALLICENCE 700 1- Spillers Russell Sandia National Laboratories, 87185, Albuquerque, NM, USA aut NATIONALLICENCE 700 1- Pruett Brian Sandia National Laboratories, 87185, Albuquerque, NM, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/3(2015-03-01), 1-12 0723-4864 56:3<1 2015 56 348