Flow-induced vibrations of low aspect ratio rectangular membrane wings

Rojratsirikul P., Genc M. S., Wang Z., Gursul I.

Journal of Fluids and Structures, cilt.27, sa.8, ss.1296-1309, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 27 Sayı: 8
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.jfluidstructs.2011.06.007
  • Dergi Adı: Journal of Fluids and Structures
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1296-1309
  • Anahtar Kelimeler: Membrane, Vortices, Vortex shedding, MICRO AIR VEHICLES, LOW-REYNOLDS-NUMBERS, AERODYNAMIC COEFFICIENTS, FLAT-PLATE, AIRFOIL, MODEL
  • Erciyes Üniversitesi Adresli: Evet

Özet

An experimental study of a low aspect ratio rectangular membrane wing in a wind tunnel was conducted for a Reynolds number range of 2.4×104-4.8×104. 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. © 2011 Elsevier Ltd.