Computation of unsteady viscous flow and aeroacoustic noise of cross flow fans

Moon, Young J.; Cho, Yong; Nam, Hyun Sik

doi:10.1016/s0045-7930(02)00068-3

Cited by 59 publications

(43 citation statements)

References 16 publications

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“…The sliding-mesh technique is applied to model the rotating fan. At the sliding-mesh interface, between the rotating and stationary grids, the unstructured finite-volume method requires some modifications to evaluate the fluxes and to solve Poisson's equation [13]. These are numerically realized by using the commercial CFD program, Fluent TM .…”

Section: Methodsmentioning

confidence: 99%

Development of low-noise axial cooling fans in a household refrigerator

2011

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Experimental and numerical investigation on the aerodynamic noise of axial fans is carried out to develop a low-noise fan, which is used to cool a compressor and a condenser in the mechanical room in a household refrigerator. First, the noise performance of the target fan is experimentally investigated and, then, computational aeroacoustic techniques based on the hybrid method are applied to predict the radiated sound pressure levels. The validity of the computational aeroacoustic techniques is confirmed by comparing the predictions with the measurements. To develop a low-noise fan, we came up with two design concepts: one is that the uneven grooves are made on the surface of the suction side of blade along the rotational direction, and the other is that two different blades are combined into one blade. We have set systematic numerical analysis to evaluate the effects of these design factors on the noise generation of axial cooling fans. On the basis of the prediction results showing the possible reduction of noise levels by applying the proposed design factors to the existing fan, experiments using a full refrigerator with two prototype fans are made, which show that the sound power levels from the newly developed fans are less than those of noise from existing fans. Finally, an additional experiment performed by using a grooved/doublebladed fan installed in a household refrigerator shows that the overall noise from the new fan is reduced by approximately 1 dB to 2.2 dB in comparison with that from the existing fan in the refrigerator over the rotating speeds from 1090 rpm to 1210 rpm.

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Section: Methodsmentioning

confidence: 99%

Development of low-noise axial cooling fans in a household refrigerator

2011

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“…Despite the knowledge accumulated over the past few decades on the design of turbomachinery, the accurate prediction of this kind of flow fields by numerical means is still difficult. This is partly due to the limits of the turbulent models and to the complexity of the flow through such a machine where occur separations and possibly non-axisymmetry having an effect on the performance of the components downstream, see Moon et al (2003); Seo et al (2003). There are still significant differences between computations and experimental results, mainly in the prediction of the separation after the bend and its extent.…”

Section: Aerodynamic Studymentioning

confidence: 99%

Aerodynamic and Aeroacoustic Study of a High Rotational Speed Centrifugal Fan

Khelladi¹,

Sarraf²,

Bakir³

et al. 2012

Applied Aerodynamics

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“…However, from the physical standpoint of sound generation and propagation, acoustic waves in internal flows are influenced by interference between the wall and noise sources in addition to interference between the noise sources themselves [3]. Interference between the wall and noise sources leads to modal solutions in internal acoustic fields [4].…”

Section: Introductionmentioning

confidence: 99%

Prediction and Reduction of Aerodynamic Noise of the Multiblade Centrifugal Fan

Zhou

Wang

2014

Advances in Mechanical Engineering

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An aerodynamic and aeroacoustic investigation of the multiblade centrifugal fan is proposed in this paper, and a hybrid technique of combining flow field calculation and acoustic analysis is applied to solve the aeroacoustic problem of multiblade centrifugal fan. The unsteady flow field of the multiblade centrifugal fan is predicted by solving the incompressible Reynolds-averaged NavierStokes (RANS) equations with conventional computing techniques for fluid dynamics. The principal noise source induced is extracted from the calculation of the flow field by using acoustic principles, and the modeled sources on inner and outer surfaces of the volute are calculated with multiregional boundary element method (BEM). Through qualitative analysis, the sound pressure amplitude distribution of the multiblade centrifugal fan in near field is given and the sound pressure level (SPL) spectrum diagram of monitoring points in far field is obtained. Based on the analysis results, the volute tongue structure is adjusted and then a lownoise design for the centrifugal fan is proposed. The comparison of noise tests shows the noise reduction of improved fan model is more obvious, which is in good agreement with the prediction using the hybrid techniques.

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Computation of unsteady viscous flow and aeroacoustic noise of cross flow fans

Cited by 59 publications

References 16 publications

Development of low-noise axial cooling fans in a household refrigerator

Development of low-noise axial cooling fans in a household refrigerator

Aerodynamic and Aeroacoustic Study of a High Rotational Speed Centrifugal Fan

Prediction and Reduction of Aerodynamic Noise of the Multiblade Centrifugal Fan

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