2007
DOI: 10.1155/2007/34901
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Influence of Impeller Geometry on the Unsteady Flow in a Centrifugal Fan: Numerical and Experimental Analyses

Abstract: The aim of this study is to evaluate the influence of design parameters on the unsteady flow in a forward-curved centrifugal fan and their impact on the aeroacoustic behavior. To do so, numerical and experimental studies have been carried out on four centrifugal impellers designed with various geometrical parameters. The same volute casing has been used to study these impellers. The effects on the unsteady flow behavior related to irregular blade spacing, blade count and radial distance between the impeller pe… Show more

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Cited by 25 publications
(19 citation statements)
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“…When flow separation appeared, the results of Baldwin-Lomax model were poor and - models were recommended. Younsi et al (2007) studied an air moving fan experimentally and numerically. The impeller outer diameter was 160 mm and the rotation speed was 3 kRPM, which established a blade tip speed of 25 m/s.…”
Section: Introductionmentioning
confidence: 99%
“…When flow separation appeared, the results of Baldwin-Lomax model were poor and - models were recommended. Younsi et al (2007) studied an air moving fan experimentally and numerically. The impeller outer diameter was 160 mm and the rotation speed was 3 kRPM, which established a blade tip speed of 25 m/s.…”
Section: Introductionmentioning
confidence: 99%
“…These confined configurations imply important interactions between the impeller and the volute casing. This is a key concern for noise generation in centrifugal fans, which is often dominated by tones at the blade passing frequency and its higher harmonics [Ballesteros-Tajadura et al, 2006] [Younsi et al, 2008]. Due to the increasingly strict environmental restrictions and human comfort requirements, this aerodynamic noise generated by blowers is receiving more research attention, both experimentally and numerically.…”
Section: Introductionmentioning
confidence: 99%
“…There have been several recent papers that have solved for the unsteady flow field in the fan with computational fluid dynamics (CFD) that uses a turbulence model and then applies the FW-H aeroacoustic analogy to calculate the sound radiated by the a fan. Younsi, Bakir, Kouidri & Rey (2008) achieved some success in predicting the tonal component of the sound generated by a shrouded, radial fan in the free field by solving the Unsteady Reynolds Averaged Navier Stokes (URANS) equations using the k omega Shear Stress Transport (kω-SST) turbulence model summarized by Menter, Kuntz, & Langtry (2003) and applying the FW-H aeroacoustic analogy. Younsi et al (2008) used only the fan blade surfaces as sources and ignored the fan shroud as a possible source.…”
Section: Introductionmentioning
confidence: 99%