Abstract
A flow-induced vibration (FIV) investigation to realize oscillation control and drag reduction for an elastically mounted cylinder with double splitter plates (DSPs) attached was undertaken in a water tunnel at Reynolds number of 1100-7700. The length of the splitter plate is in a range of L∗ = 0-2.0 (L∗ = L/D, L is the plate length, D is the cylinder diameter). The intersection angle between two plates, δ, varies from 0°−90°. The dependence of oscillation characteristics, vortex evolution and drag force coefficients on L∗−δ is illustrated in detail. Four oscillation patterns are identified: VIV, combined VIV-galloping, separated VIV-galloping, and suppressed patterns. Under similar structural parameters, the device can perform well both in high and low mass ratio systems, which implies that mass ratio has little effect on the suppression efficiency of DSPs. Besides, the drag force coefficient is proportional to the vertical span of the plate tips, Lp, and the empirical formula is yielded. For Lp<1.3, both oscillation suppression and drag reduction can be attained. Flow visualization shows that the fixed separation points of shear layers resulting in the destructive vortex shedding in the downstream, which is responsible for the wake-stabilization in the downstream and FIV suppression.
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