Abstract

Results from wind-tunnel tests conducted on a pitching 60-deg delta wing in ramp-up motion are presented and described. The wing was instrumented with 192 miniature pressure transducers, which, in conjunction with a powerful multichannel data-logging system, allowed the distribution of time-varying surface pressures to be measured at high temporal resolution for a range of pitching cases. In addition to allowing the forward progression of vortex breakdown with incidence to be tracked, it has been possible to isolate dominant postbreakdown buffet frequencies in both the static and pitching cases. It is demonstrated that, during pitch up, these frequencies differ significantly from those of the static case, indicating that alterations in flow structure may be taking place

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