EXPERIMENTAL INVESTIGATION OF THE WALL PRESSURE FLUCTUATIONS IN SUBSONIC SEPARATED FLOWS
BOEING COMMERCIAL AIRPLANE CO RENTON WA
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Experimental measurements of static pressures, fluctuating wall pressures, and mean velocity profiles are presented for subsonic turbulent separated flows. Separation was induced by three types of geometrical configurations Backward-facing steps 12, 1, and 1-12 inches high forward- facing steps 12 and 1 inch high and fences 12 and 1 inch high. Measurements were made for free stream velocities of 170, 280, and 370 ftsec. It was found that the base pressure was essentially Reynolds number independent. The separation length was independent of speed and proportional to the height of the configuration causing flow separation. The wall pressure fluctuations associated with the separated flows were of higher magnitudes than those caused by attached turbulent boundary layers and reached maximum values near reattachment.
- Fluid Mechanics