Frequency Characteristics and Fluid Flow Property of Flow-Induced Vibration

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  • 流体自励振動の流動特性と振動数決定機構に関する研究
  • リュウタイジレイシンドウ ノ リュウドウ トクセイ ト シンドウスウ ケッテイ キコウ ニ カンスル ケンキュウ

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Abstract

<p>Flow-induced acoustic resonance in a piping system containing closed coaxial side-branches was investigated experimentally. Resonance characteristics of the piping system were examined by a microphone. The results revealed that the resonance frequencies of the shear layer instability were locked in corresponding to the natural frequencies of the side-branches. Phase-averaged velocity fields were obtained two-dimensionally in the junction of coaxial side-branches by dynamic particle image velocimetry (PIV), while the acoustic resonance was induced at the first and second hydrodynamic modes. The DPIV can acquire time-series velocity fluctuations, then, two-dimensional phase delay maps under resonance and off-resonance conditions in the junction of coaxial side-branches were obtained. Experimental results show that the proposed phase delay map method costs less experiment and computation time and achieves a better accuracy and repetition than the phase-locking technique. In addition, the phase delay map method can obtain phase difference under the different frequency components.</p>

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