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Title: Unsteady flow dynamics and acoustics of two-outlet centrifugal fan design
Authors: Wong, IYW
Leung, RCK 
Law, AKY
Issue Date: 2011
Source: AIP Conference proceedings, 2011, v. 1376, p. 467-469
Abstract: In this study, a centrifugal fan design with two flow outlets is investigated. This design aims to provide high mass flow rate but low noise performance. Two dimensional unsteady flow simulation with CFD code (FLUENT 6.3) is carried out to analyze the fan flow dynamics and its acoustics. The calculations were done using the unsteady Reynolds averaged Navier Stokes (URANS) approach in which effects of turbulence were accounted for using κ‐ε model. This work aims to provide an insight how the dominant noise source mechanisms vary with a key fan geometrical paramters, namely, the ratio between cutoff distance and the radius of curvature of the fan housing. Four new fan designs were calculated. Simulation results show that the unsteady flow‐induced forces on the fan blades are found to be the main noise sources. The blade force coefficients are then used to build the dipole source terms in Ffowcs Williams and Hawkings (FW‐H) Equation for estimating their noise effects. It is found that one design is able to deliver a mass flow 34% more, but with sound pressure level (SPL) 10 dB lower, than the existing design.
Keywords: Centrifugal fan
Noise reduction
Unsteady flow dynamics
Publisher: American Institute of Physics
ISBN: 978-0-7354-0936-1
ISSN: 0094-243X (print)
1551-7616 (eISSN)
DOI: 10.1063/1.3651949
Rights: © 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in I. Y. W. Wong Ho & et al., AIP Conf. Proc. 1376, 467-469 (2011) and may be found at
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