EFFECTS OF THREE-DIMENSIONALITY FOR AN OSCILLATING-WING POWER-GENERATORFerhat Karakas and Idil Fenercioglu Flow structures around and in the near wake of an oscillating-wing power-generator undergoing nonsinusoidal pitch and plunge motions were investigated for various motion parameters. Flow visualizations are performed to reveal the spanwise flow structure evolution of a non-profiled flat plate. The study is performed in a water channel at chord length based Re = 10 000 using the DPIV (Digital Particle Image Velocimetry) technique in line with direct force measurements. Quantitative flow visualizations are performed for three different planes along the span of the test model to comment on the three dimensionality effects. The flat plate oscillates with non-sinusoidal pitch leading plunge motions with phase angle of phi = 90degree about its 0.44c pitch pivot point from the leading edge with stroke reversal times of 0.1 (rapid reversal) to 0.5 (sinusoidal reversal). The kinematic motion is conducted at fixed reduced frequency of k = 0.8 with plunge amplitude of 1.05 chord and pitch amplitude of 73 degree. |