直列配列2角柱の変動流体力特性に及ぼす主流乱れの影響

概要

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Fluctuating fluid forces acting on two square prisms in tandem arrangement under free-stream turbulence were studied experimentally. In particular, paying attention to the region of jump phenomenon, the region of the jump occurrence, the switching frequency of the jump and the fraction of the time of the occurrence of one flow pattern were studied in detail. Obtained results are summarized as follows : (i) The location of the region of jump phenomenon shifts toward the upstream prism as the free-stream turbulence increases. (ii) As the free-stream turbulence increases, the flow pattern around the two prisms becomes unstable, and the switching frequency of the jump largely increase. (iii) Fluid forces acting on the upstream prism were found to be strongly subject to the free-stream turbulence. (iv) Free-stream turbulence was found to significantly change the vortex shedding frequency. In particular, at the region of synchronization, the Strouhal numbers of the two prisms were found to increase considerably as the free-stream turbulence increased.
1988-02-25