正弦的脈動流を受ける角柱放出渦のLock-in

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This paper describes the lock-in of the vortex shedding from a rectangular cylinder insinusoidal pulsating flow. The side ratios d/h of the models used for measurements are variedover the range 0.6-2.5. Here, d is the depth and h is the height of the cylinder. Sinusoidalpulsating flow is created using a wind tunnel of multi-fun type, where the forced frequency isvaried from 0 to 4.6Hz. Dimensionless amplitude ratio ε is set to 0.05, where ε=ΔU/(2πfd) andthe pulsating component is expressed by ΔU sin2πft. The vortex shedding frequency tends to theline f=2fs, and eventually coincides with that line, meaning that lock-in commences somewhatprior to f/fso=2, where f is the frequency of pulsating flow, fs the vortex shedding frequency, andfso the natural vortex shedding frequency. For this range, the base pressure decreasessignificantly.
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