科研之友
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摘要
A new method was proposed to analyse the intensity and location of dominant aerodynamic noise source and the type of the noise in a centrifugal fan. In this method, the numerical solution of aeroacoustic field was avoided because of the difficulties of solving the Green function in an irregular space. To find the noise source, the three-dimensional unsteady viscous flow in the centrifugal fan was calculated by applying finite volume method and high order discrete scheme. Then, the time-domain and frequency-domain analyses on fluctuating component of static pressure in the flow field were carried out. Based on these numerical results, the intensity and location of dominant aerodynamic noise source and the type of the noise were ascertained according to the acoustic principles and the characteristics of the sound propagation. The present method was applied to an industrial centrifugal fan with forward-curved blades. And the numerical results were compared with our experimental data for the same machine. It is concluded that this method could contribute significantly to indicating the sound generation mechanisms inside centrifugal fans and be valuable for noise reduction of the fans.
- 出版日期2005
