J1002-1-5 テーパ円柱から発生する空力音と後流渦との関係(流体関連の騒音と振動1)

概要

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The flow characteristics of the tapered cylinder were investigated in relating to the aeolian tone. The tapered cylinder was inclined toward to the flow direction. The experimental and numerical methods were examined to clear the mechanism of the aeolian tone generation. The aeolian tone from the tapered cylinder is large not at the zero inclined angle, but at negative or positive angles. The wake vortex shedding is occurred even at the large inclined conditions. The aeolian tone is governed with not only the strength of the wake vortex shedding, but also the location of the rolling up of the wake vortex. At the small inclined angles, the large dead air region forms after the body and the wake vortex rolls up with large structure in span, but the fluctuation of surface pressure is not influenced with the vortex shedding so much. At large inclined angles, the wake vortex rolls up at each span location with the large span-wise flow in the dead air region.
2009-09-12