Assessment of Digital Image Correlation as a method of obtaining deformations of a structure under fluid load

摘要: Abstract Digital Image Correlation (DIC) is employed for the measurement of full-field deformation during fluid–structure interaction experiments in a wind tunnel. The methodology developed tunnel environment quantitatively assessed. static error system shown to be less than 0.8% when applied curved aerofoil specimen moved through known displacements using micrometre. Enclosed camera fairings were required minimise due induced vibration under aerodynamic loading. was demonstrated high performance foil, from NACRA F20 sailing catamaran, tested within University Southampton RJ Mitchell, 3.5 mx2.4 m, forces are relatively small, compared with typical hydrodynamic loading, resulting small deformations. coupled deflection and blade twist evaluated over tip region (80–100% Span, measured root) range speeds angles attack. Steady deformations at low attack well captured however unsteady higher observed as an increase variability hardware limitations current DIC system. It concluded that sample rates assess future. full field data reveals limited attack, below stall angle. For larger angles, however, there tendency reduce effective angle structure, combined structural response. This capability highlights benefits presented fixed-point measurements three dimensional foil deflections can assessed large region. In addition, demonstrates very resolved.