플랩이 있는 공동 부근에서의 유동특성 해석Numerical Analysis on Flow Characteristics Around a Cavity with Flaps
- Other Titles
- Numerical Analysis on Flow Characteristics Around a Cavity with Flaps
- Authors
- 송시몬; 송호성; 박준홍
- Issue Date
- Sep-2008
- Publisher
- 대한기계학회
- Keywords
- 차간공간; 고속열차; 공동; 플랩; 유동소음; Inter-coach Spacing; High Speed Train; Cavity; Flap; Aero-acoustic Noise
- Citation
- 대한기계학회논문집 B, v.32, no.9, pp.645 - 651
- Indexed
- SCOPUS
KCI
- Journal Title
- 대한기계학회논문집 B
- Volume
- 32
- Number
- 9
- Start Page
- 645
- End Page
- 651
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/177876
- DOI
- 10.3795/KSME-B.2008.32.9.645
- ISSN
- 1226-4881
- Abstract
- For a high speed train driving at 300 km/h, aero-acoustic noise is a dominant component among various noise sources. The aeroacoustic noise is mainly due to inter-coach spacings because discontinuities in the train surface significantly disturb turbulent flows. This often leads to the uncomfortableness of passengers. Interestingly, the aero-acoustic noise reduces with decreasing the mud-flap spacing of the inter-couch spacing. We perform numerical simulations to investigate flow characteristics around the inter-coach spacing. We model the inter-coach spacing as a simple 2-D cavity with flaps, and calculate the velocity and pressure field using two equation turbulence models, varying the flap spacing. The results show that a wider flap spacing develops a higher inflection point in mean velocity profiles over the cavity. It is likely that large eddies generated near the inflection point persist longer in the downstream since they are less affected by the wall. This probably induces the more aero-acoustic noises. The wider spacing also results in the larger pressure difference between the inside and outside of the cavity. This is also responsible for the increased noise since the large difference would cause a strong flow oscillations in and out of the cavity.
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