1105 流れ中に置かれたフィン付き複数円柱から発生する空力音の特性(OS11-2 流体関連振動・騒音,OS11 流体関連振動・騒音)

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  • 1105 Characteristics of Aerodynamic Sound Radiated from Finned Tubes

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In the present paper the attention is focused on the characteristics of aerodynamic sound radiated from two or three finned cylinders exposed to cross-flow. We measured the spectrum of SPL for the cylinder spacing ratios ranged from 0 to 1.05 in the transverse direction or the ratios from 0 to 6.8 in the flow direction at Reynolds number of 1.7 X 105. As a result, the peak SPL for two finned cylinders at the cylinder spacing ratios less than about 2.0 in the flow direction was smallest in the tandem finned cylinders. And the peak SPL was largest at the cylinder spacing ratio of 0.72 in the transverse direction. The peak SPL at the cylinder spacing ratios of 0.72 in the transverse direction and 1.24 in the flow direction for three finned cylinders was smaller than those of the two finned cylinders.

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