Abstract
Previously, we have investigated the effect of shock wave/boundary layer interaction (SBLI) on a flexible panel flutter characteristics. The results indicate that a sufficiently strong laminar SBLI causes flow separation near the point of impingement, causing onset of chaotic but self-sustained flutter in the panel. Whereas, for weak turbulent SBLI the flow separation does not occur and the panel exhibits a single frequency limit cycle oscillations. In this work, we investigate panel flutter suppression using micro-ramp installed upstream of the impingement location as a passive flutter suppression device for pressure ratio of 1.4 and 1.8 in laminar and turbulent flow conditions. The results indicate that for turbulent SBLI, where flow separation does not occur, the panel flutter amplitude is suppressed by a factor of 1.37 to 1.72 at the expense of a minute increase in the frequency. On the other hand, for laminar SBLI, a complex interaction occurs due to the micro-ramp, which in the best case produced up to a factor of 5.55 reduction in the flutter frequency and a factor of 4.73 increase in the flutter amplitude.
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