科研之友
微信
新浪微博
Facebook
分享链接
摘要
The prediction method for identifying the acoustic source generated from a centrifugal impeller is developed. To predict the acoustic field, the three-dimensional unsteady flow fields and unsteady forces fluctuations are calculated by solving Navier-Stokes equations with SIMPLEC algorithm. The results show that the aeroacoustics is dominated by tones at blade passage frequency and the higher harmonics in a centrifugal impeller with vaned diffuser. To reveal the effects of the moving sound source, three acoustic formulas are applied to calculate the acoustic pressure. It is indicated that the moved acoustic source remarkably disturbs the intensity of acoustic field with obvious Doppler effect, the variation of acceleration can be neglected, the whole rotating impeller is reasonably regarded as a dipole source with simple harmonic motion.
- 出版日期2006
