2715 直交流れによる円柱群の流れ方向振動に関する実験検討(J20-4 流体関連の騒音と振動(4) 流体連成振動の実験解析,ジョイントセッション,21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

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The importance of the in-flow oscillation of a single cylinder in cross-flow has been highlighted since an accident in a FBR-type reactor. In-flow oscillations have also been observed in tube arrays. In our previous report an experimental study on this phenomenon has been reported, where a total of nine cylinders in a water tunnel, one single cylinder, two & three cylinders in parallel & in tandem, and a four-cylinders bundle, have been examined. The results indicate that some coupled in-flow motions as in cylinder arrays have been excited both with symmetric shedding vortex and alternate vortex shedding. However, it is required to confirm whether these coupled motions of the cylinder array are caused only by vortex shedding or with another mechanism such as the fluid-elastic instability, or to distinguish the above mentioned two types of vortex mechanisms. Then, the test cylinders and the flow section are modified to examine this mechanism in the present work.
2008-08-02