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Reduction of flow-induced noise in a household air purifier

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Abstract

In this study, we propose a design for a household air purifier that reduces the flow-induced noise caused by the impeller of the fan system. The noise of the air purifier was identified in experiments as induced by the air flow generated by the impeller of the purifier. This noise can be classified into tonal noise and wide-band frequency noise: The former is the noise from the impeller blade turning, and the latter is from air flow turbulence. Using a commercial computational fluid dynamics (CFD) analysis code, it was shown that flow separation occurs at the outlet of the scroll by the adverse pressure gradient, which significantly reduces the flow rate of the purifier. To avoid flow separation and maximize flow rate within the adjustable ranges of the design parameters, an improved air purifier was redesigned using an orthogonal array table. By CFD analysis, the improved design showed an increased flow rate without flow separation. Finally, after fabricating a prototype with the improved design, it was experimentally proven that noise was reduced by 4.2 dBA without sacrificing flow rate.

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Abbreviations

f B :

Blade passing frequency

n :

Arbitrary positive integer

N :

Number of blades

X :

Rotational frequency of the impeller

ω1, ω2 :

Rotation speed

Q1, Q2 :

Flow rate

p1, p2 :

Sound pressure

α :

Cut-off angle

R c :

Cut-off radius

c :

Cut-off clearance

β 1 :

Blade inlet angle

β 2 :

Blade outlet angle

l :

Blade length

\({\overline x _i}\) :

Cartesian coordinate

\({\overline u _i}\) :

Mean velocity

\(\overline u _i^\prime \) :

Mean fluctuating velocity

\(\overline p \) :

Mean pressure

ρ :

Fluid density

μ :

Fluid viscosity

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Authors and Affiliations

Authors

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Correspondence to Jintai Chung.

Additional information

Recommended by Editor No-cheol Park

Booyeong Lee received his B.S. degree in 2013 from the Department of Mechanical Engineering at Hanyang University. He is currently a Ph.D. candidate in the Department of Mechanical Engineering at Hanyang University. His research interests are the prediction of vibration and noise of mechanical systems using in-house code based on finite element method.

Woojeong Sim received his B.S. degree in 2013 from the Department of Mechanical Engineering at Hanyang University. He is currently a Ph.D. candidate in the Department of Mechanical Engineering at Hanyang University. His research interests are the vibration of mechanical systems with a contact and noise reductions of vehicles and home appliances.

Jintai Chung received his B.S. and M.S. degrees from the Department of Mechanical Engineering at Seoul National University in 1984 and 1986, respectively. He obtained his Ph.D. degree from the Department of Mechanical Engineering at University of Michigan, Ann Arbor in 1992. He is currently a Professor in the Department of Mechanical Engineering at Hanyang University. His research interests are vibration and noise reductions of rotating machines, vehicles and home appliances.

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Lee, B., Sim, W., Jo, J. et al. Reduction of flow-induced noise in a household air purifier. J Mech Sci Technol 34, 3105–3115 (2020). https://doi.org/10.1007/s12206-020-0701-7

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  • DOI: https://doi.org/10.1007/s12206-020-0701-7

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