Reduction of flow-induced noise in a household air purifier
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DOI 10.1007/s12206-020-0701-7
Journal of Mechanical Science and Technology 34 (8) 2020 Original Article DOI 10.1007/s12206-020-0701-7 Keywords: · Household air purifier · Flow-induced noise · Tonal noise · Wide-band noise · CFD analysis · Flow separation · Orthogonal array table · Fan laws
Correspondence to: Jintai Chung [email protected]
Citation: Lee, B., Sim, W., Jo, J., Chung, J. (2020). Reduction of flow-induced noise in a household air purifier. Journal of Mechanical Science and Technology 34 (8) (2020) ?~?. http://doi.org/10.1007/s12206-020-0701-7
Reduction of flow-induced noise in a household air purifier Booyeong Lee1, Woojeong Sim1, Junhyeon Jo2 and Jintai Chung1 1
Department of Mechanical Engineering, Hanyang University, 55, Hanyangdaehak-ro, Sangrok-gu, 2 Ansan-si, Gyeonggi-do 15588, Korea, Rental Marketing Product Planning Team, SK Magic Co., 250, Hyohaeng-ro, Bongdam-eup, Hwaseong-si, Gyeonggi-do 18298, Korea
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.
Received September 24th, 2019 Revised
May 3rd, 2020
Accepted May 18th, 2020 † Recommended by Editor No-cheol Park
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
1. Introduction In recent years, the demand for household air purifiers has increased as the concentration of fine dust harmful to the human body has risen in the East Asian atmosphere. The household air purifier is a device that purifies contaminants contained in the air of a residential space and converts the contaminated air to fresh air. Because consumers are always exposed to the noise of air purifiers that operate 24 hours a day in a residential space, noise is a very important factor in the purchasing decision. In particular, the importance of noise becomes more remarkable at night when ambient noise is low. Therefore, manufacturers are making great efforts to reduce the noise of air purifiers. There have been few studies on noise reduction in household air puri
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