D231 壁の軟らかい曲り管の空力音

概要

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150 WORDS The aerodynamic sound generated by flow in curved tubes was observed outside the soft wall of the duct, to be compared with straight duct results. This experiment models breath sound of a human patient whose neck is bent by, for instance, use of a pillow : In such situation, the breath sound is clinically known to be enlarged. One of the side walls of a square test duct was made with a paper sheet to let sound be observed outside the wall, just like with a human airway. The sound thus observed is normally increased by duct curvature, suggesting effects of unsteady flow separation on inner wall. There is observed, however, some irregulary. Taking into consideration of change in average distance between the microphone and the sources seems to expalin it.
日本流体力学会の論文
2001-07-31