Abstract
The mean wall static pressure and the pressure fluctuation were measured near the separation shock wave produced by the turbulent boundary layer separation ahead of the forward-facing steps, and the A-D transformed pressure signals were statistically correlated. The oscillation model was presented. The highest peak of the pressure fluctuation occurred at the foot of the separation shock wave. The oscillation of the separation shock wave was mainly due to the low frequency fluctuation at the separated region and also to the high frequency fluctuation of the upstream turbulent boundary layer. The propagation speed of the low frequeocy component was far lower than the speed of sound and was comparable to the recirculation velocity in the separated region.
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