지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2002.5
- 수록면
- 1,866 - 1,871 (6page)
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초록· 키워드
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Flow structures around a circular cylinder with different grooved surfaces (U- and V-shaped)
have been investigated experimentally. The results were compared with those for a smooth cylinder
of the same diameter D. The drag force acting the cylinders were measured for Reynolds numbers
based on the cylinder diameter (D=60mm) in the range ReD=8×103~1.4×105. At ReD=1.4×105, the
U-type grooved surface reduced the drag coefficient by 18.6%, compared with the smooth cylinder.
However, the drag reduction of V-type grooves was only 2.5% at the same Reynolds number. In
order to see the time-evolution of velocity field behind the grooved cylinders, the cinematic PIV
technique was employed. Particle images were acquired at the time interval of 5ms(=200fps),
corresponding to about 1% of the formation period of large-scale vortices. The sequential velocity
fields show three-dimensional space-time relationship between the instantaneous streamwise
vorticity and the phase of the large-scale vortex formation. Unlike the periodic vortex structure in
the near-wake region at low Reynolds number of 100s, the vortex structure at Re = 12,000 is not so
clearly periodic in the vortex formation region.
have been investigated experimentally. The results were compared with those for a smooth cylinder
of the same diameter D. The drag force acting the cylinders were measured for Reynolds numbers
based on the cylinder diameter (D=60mm) in the range ReD=8×103~1.4×105. At ReD=1.4×105, the
U-type grooved surface reduced the drag coefficient by 18.6%, compared with the smooth cylinder.
However, the drag reduction of V-type grooves was only 2.5% at the same Reynolds number. In
order to see the time-evolution of velocity field behind the grooved cylinders, the cinematic PIV
technique was employed. Particle images were acquired at the time interval of 5ms(=200fps),
corresponding to about 1% of the formation period of large-scale vortices. The sequential velocity
fields show three-dimensional space-time relationship between the instantaneous streamwise
vorticity and the phase of the large-scale vortex formation. Unlike the periodic vortex structure in
the near-wake region at low Reynolds number of 100s, the vortex structure at Re = 12,000 is not so
clearly periodic in the vortex formation region.
목차
Abstract
1. 서론
2. 실험장치 및 방법
3. 결과 및 토의
4. 결론
후기
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UCI(KEPA) : I410-ECN-0101-2009-550-014201612