On the Study of Aerodynamic Noise Measurement of Turbulent Flow Field with a Low-noise Turbulence Generator(Fluids Engineering)
On the Study of Aerodynamic Noise Measurement of Turbulent Flow Field with a Low-noise Turbulence Generator(Fluids Engineering)
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低噪声湍流发生器测量湍流流场气动噪声的研究（流体工程）
DOI：
10.1299/kikaib.73.1629
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
H. Makita
中科院分区：
文献类型：
--
作者：
A. Iida;K. Morita;H. Tanida;Toshitaka Minbu;A. Mizuno;H. Makita
本研究的目的是阐明湍流对气动噪声产生的影响。为了估算湍流场中汽车和高速列车的气动噪声，研制了一种适用于小型风洞的低噪声湍流发生器。所研制的发生器产生了一个大的湍流场，在湍流能谱中具有惯性子区。发电机的噪声水平足够小，可以从汽车和高速列车的模型中估计空气动力学噪声。实验结果表明，非定常声是由来流湍流引起的。噪音水平取决于湍流的规模。这些结果表明，主动式湍流发生器对湍流流场中汽车气动噪声的估算是有用的。
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.