Wind tunnel experiments were conducted to understand the turbulence-induced motions of a rigid at plate able to rotate at its quarter span. Dominant coherent motions that varied along the vertical direction were imposed on the incoming flow using a variety of tapered cylinders. Emphasis is placed on the effect of cylinder tapered ratio Rt= 6.4, 9.5 and 18.6, incoming flow velocity U0= 3, 4.6 and 6 m s1 and cylinder-plate spacing Ld=c 2[2, 8]. Results show that the plate oscillations is dominated by two distinct modes. One of them corresponds to the mean flow-induced oscillation frequency, fp, whereas the other is synchronized with the cylinder vortex shedding frequency, fv. The trends of these two frequencies is different with cylinder tapered ratio. The fv was proportional with Rt; however, fp was inversely proportional to Rt.
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CHENG-THESIS-2019.pdf
