期刊
JOURNAL OF FLUID MECHANICS
卷 679, 期 -, 页码 247-262出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2011.135
关键词
boundary layer separation; high-speed flow; shock waves
资金
- AFRL [FA8655-08-1-3091]
An investigation into parameters affecting separation in normal shock wave/boundary layer interactions (SBLIs) has been conducted. It has been shown that the effective aspect ratio of an experimental facility (defined as delta*/tunnel width) is a critical factor in determining when shock-induced separation will occur. Experiments examining M(infinity) = 1.4 and 1.5 normal shock waves in a wind tunnel with a small rectangular cross-section have been performed and show that a link exists between the extent of shock-induced separation on the tunnel centre-line and the size of corner-flow separations. In tests where the corner-flows were modified ahead of the shock (through suction and vortex generators), the extent of separation around the tunnel centre-line was seen to vary significantly. These observations are attributed to the way corner flows modify the three-dimensional shock-structure and the impact this has on the magnitude of the adverse pressure gradient experienced by the tunnel wall boundary layers.
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