Flow-induced vibrations of low aspect ratio rectangular membrane wings

Pinunta Rojratsirikul, M S Genc, Zhijin Wang, Ismet Gursul

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An experimental study of a low aspect ratio rectangular membrane wing in a wind tunnel was conducted for a Reynolds number range of 2.4104-4.8104. Time-accurate measurements of membrane deformation were combined with the flow field measurements. Analysis of the fluctuating deformation reveals chordwise and spanwise modes, which are due to the shedding of leading-edge vortices as well as tip vortices. At higher angles of attack, the second mode in the chordwise direction becomes dominant as the vortex shedding takes place. The dominant frequencies of the membrane vibrations are similar to those of two-dimensional membrane airfoils. Measured frequency of vortex shedding from the low aspect ratio rigid wing suggests that membrane vibrations occur at the natural frequencies close to the harmonics of the wake instabilities. Vortex shedding frequency from rigid wings shows remarkably small effect of aspect ratio even when it is as low as unity.
Original languageEnglish
Pages (from-to)1296-1309
Number of pages14
JournalJournal of Fluids and Structures
Issue number8
Publication statusPublished - Nov 2011


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