Abstract
The hybrid method combining computational fluid dynamics and acoustic analogy is used to investigate numerically the flow field and sound field of centrifugal fan for air conditioner. And the mass flow rate and noise of centrifugal fan are measured experimentally, which verifies the validity of the computational model and numerical method. As for the unconventional volute used in the original fan, the middle section profile of the volute is extracted to restructure the volute shape with straight tongue. And then, three kinds of volutes with inclined volute tongue are designed. Based on the numerical simulation and experimental measurement, an optimal inclined volute tongue is obtained. The experimental results show that the aerodynamic performance of the fan is improved under all working conditions. The maximum flow rate is increased by 6.0% and the noise is reduced by 1.4 dB(A). The numerical analysis of internal flow and sound characteristics for the optimal fan demonstrates that the intensity and vorticity near the volute tongue are obviously weakened. The power spectral density and the sound peak at the blade passage frequency are reduced, which indicates that the aerodynamic noise of the fan is effectively suppressed.
| Original language | English |
|---|---|
| Pages (from-to) | 147-153 |
| Number of pages | 7 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 41 |
| Issue number | 1 |
| State | Published - 1 Jan 2020 |
Keywords
- Aerodynamic noise
- Centrifugal fan
- Experimental test
- Numerical simula tion
- Reconstruction of volute tongue