Aerodynamic Noise Reduction by Use of a Cooling Fan with Winglets

Nashimoto, Atsushi; Akuto, Tsuneo; Nagase, Yuichi; Fujisawa, Nobuyuki

doi:10.4271/2003-01-0531

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…Nashimoto et al [20,21] and Ota et al [22] studied the influence of the tip winglets on the blade of the open fan and the annular fan evolved from it on the vortex intensity at the blade tip, which could increase the static efficient and reduce the aerodynamic noise.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation on the Influence of the Circular Ring on the Aerodynamic Noise Generated by a Cooling Fan

Feng¹,

Bian²,

Han³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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The influence of the width of the circular ring of a car cooling fan on the aerodynamic noise is investigated numerically through the determination of the overall sound pressure level (OASPL). The results demonstrate that when the circular rings cover near 2/3 of the width of the blade tips of the rotor in the axis direction, the rotor has the lowest OASPL and the related total pressure efficiency and flow mass rate are better than the corresponding values obtained for a reference rotor without a circular ring. With increasing the width of the circular ring in the axis direction, the tip vortex around the trailing edge of the blade tip becomes smaller and finally disappears. Meanwhile, a separated flow field arises gradually and then grows in size around the middle of the junction of the blade tips with the ring. When the circular rings cover nearly 2/3 s of the width of the blade tips of the fan in the axis direction, the extension of the separated flow around the blade 's tip attains a minimum. KEYWORDSCooling fan; width of the circular ring; aerodynamic noise; CFD simulation Nomenclature U Flow velocity rpm Round per minute ρ Density of fluid μ Dynamic viscosity Re Reynolds number u Means velocity of the flow e u Fluctuating velocity of the flow p Pressure Q Mass rate of the flow DP total Difference between the total pressure of the downstream and upstream of the rotor This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

A Numerical Investigation on the Influence of the Circular Ring on the Aerodynamic Noise Generated by a Cooling Fan

Feng¹,

Bian²,

Han³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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“…The outer ring structure was evolved from winglet [19]. In the earliest studies, a winglet was added at the intermediate position of compressor blades to reduce the noise level [20][21][22]. By adding the winglet on the blades, the natural frequency was changed too [20][21].…”

Section: Introductionmentioning

confidence: 99%

“…In the earliest studies, a winglet was added at the intermediate position of compressor blades to reduce the noise level [20][21][22]. By adding the winglet on the blades, the natural frequency was changed too [20][21]. Furthermore, the simulation results [5,23] indicate that the aerodynamic performance was improved obviously.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Effect of the Outer Ring of Annular Cooling Fan on the Aerodynamic Performance

Shu¹,

Yin²,

Shangguan³

et al. 2019

Preprint

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We studied the effect of the structure parameters of engine annular cooling fan with outer ring on the aerodynamic performance by means of experiments and model simulation in fluent®. Firstly, based on the experiment, a computational model is developed to calculate and analyze the aerodynamic performance of the tested annular fan. The model is validated by comparing the test results with the calculated data. Besides, the aerodynamic performance differences between two types of fans (common fan without outer ring and annular fan with outer ring) are discussed. Based on the computational model, the relation between aerodynamic performance and the outer ring structure parameters are investigated. The results show that the relative parameter on the axial direction has great influence on the aerodynamic performance; while the effect of radial relative parameter is minor. In addition, the outer ring with arc chamfer structure in the downstream side can improve its static pressure efficiency effectively.

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“…[2][3][4] tended to performed the structure optimization of fan by traditional method of Computer Dynamic Fluid (CFD), the calculation model of fan-flow-field was built and then the distribution of pressure and vortex were further analyzed, and finally the optimization design of structure was performed by their engineering experience. The optimization procedure mentioned above is blind for uncertain of the really source of decreasing of flow-field quality.…”

Section: Introductionmentioning

confidence: 99%

Optimization design of annular axial cooling fan based on circumferential vorticity analysis

Shu¹,

Yuan²

2018

Vib. proced.

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Abstract. As complex axial flow machinery, lots of vortex distributes around engine cooling fan. Negative circumferential vorticity (CV) leads to low efficiency and power loss. In order to investigate the adverse effects of CV on aerodynamic performances of the fan, a mathematical physical relationship between CV and aerodynamic performances is established, and the location of the negative CV is found by the method of vorticity analysis. An outer ring is designed for annular cooling fan, and the parameter of aperture rate is defined in this paper. Both static pressure and power loss is overall considerate during the optimization process of the outer ring, and putting forward that optimum range of the aperture rate is different for various annular fans.

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Aerodynamic Noise Reduction by Use of a Cooling Fan with Winglets

Cited by 7 publications

References 1 publication

A Numerical Investigation on the Influence of the Circular Ring on the Aerodynamic Noise Generated by a Cooling Fan

A Numerical Investigation on the Influence of the Circular Ring on the Aerodynamic Noise Generated by a Cooling Fan

A Study on the Effect of the Outer Ring of Annular Cooling Fan on the Aerodynamic Performance

Optimization design of annular axial cooling fan based on circumferential vorticity analysis

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