日本機械学会論文集 B編
Online ISSN : 1884-8346
Print ISSN : 0387-5016
低騒音乱流発生装置を用いた乱流騒音計測に関する研究
飯田 明由森田 謙次谷田 寛行民部 俊貴水野 明哲蒔田 秀治
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2007 年 73 巻 732 号 p. 1629-1636

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The purpose of this investigation is to clarify the effects of turbulence on aerodynamic noise generation. In order to estimate aerodynamic noise radiated from automobiles and high speed trains in turbulent flow fields, a low-noise turbulence generator for small wind tunnel was developed. The developed generator makes a large turbulent field which has inertial subrange in energy spectrum of turbulence. The noise level of the generator was sufficiently small to estimate the aerodynamic noise from the model of autombiles and high-speed trains. The experimental result showed that unsteady sound was generated by the incoming flow turbulence. And noise levels depend on the scale of turbulence. These results indicated that the active turbulence generator is useful for estimating the aerodynamic noise from automobiles in turbulent flow fields.

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