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Study on the reduction of flow-induced noise through the suppression of vortex shedding at rotating disk edge

Authors
Oh, Il-RockKim, Man-KiJo, Yong-WooKim, Dae-HyunChoi, Young-DonMoon, Young-JuneChung, Jin-Teak
Issue Date
12월-2012
Publisher
KOREAN SOC MECHANICAL ENGINEERS
Keywords
Rotating disk; Flow-induced noise; Vortex shedding; Kelvin-Helmholtz instability; Coherent flow structure
Citation
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY, v.26, no.12, pp.3833 - 3841
Indexed
SCIE
SCOPUS
KCI
Journal Title
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume
26
Number
12
Start Page
3833
End Page
3841
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/106722
DOI
10.1007/s12206-012-1013-3
ISSN
1738-494X
Abstract
We conducted a computational analysis to better understand the coherent flow structure that arises when the rotation of a disk drive generates flow-induced noise. We set the flow domain to be similar to the actual shape of the flow in Blu-ray disks and examined the phenomena of vortex generation and shedding at the disk edge, focusing on the source of the noise. Our results showed that disk edge vortex shedding was the primary cause of disk-drive-flow-induced noise; therefore, we investigated the technique of lowering the intensity of a disk edge vortex to reduce this noise. We attached concentric projections onto the cover of the disk to suppress the flow returning to the center of the disk through the gap between the disk and cover. Noise induced by disk rotation was reduced by 2.68 dB at the optimal setting: projections 0.002 m wide and 0.006 m width between the projections (and thus a ratio of 1: 3).
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