지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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International Towing Tank Conference (ITTC) recommended verifying a ship’s ability to move transversely at zero forward speed without altering heading by a crabbing test. In sea trial, all available propellers/rudders/thrusters should be used to find the maximum possible transverse speed.
The main objective of the present study is to investigate the roles of the micro-dimpled surface on the drag reduction. To investigate the effectiveness of the micro-dimpled surface, the flat plates are prepared. The micro-size dimples are directly carved on the metal surface by ultrasonic nano-crystal surface modification (UNSM) method. Momentum of the main flow is increased by the dimple patterns within the turbulent boundary layer (TBL), however, there is no significant change in the turbulence intensity in the TBL. The influence of dimple patterns is examined through the flow field survey near the flat plate trailing edge in terms of the profile drag. The wake flow velocities in the flat plate are measured by PIV technique. The maximum drag reduction rate is 4.6% at the Reynolds number of 10?~10?. The dimples tend to increase the dragr eduction rate consistently even at high Reynolds number range.
The main objective of the present study is to investigate the roles of the micro-dimpled surface on the drag reduction. To investigate the effectiveness of the micro-dimpled surface, the flat plates are prepared. The micro-size dimples are directly carved on the metal surface by ultrasonic nano-crystal surface modification (UNSM) method. Momentum of the main flow is increased by the dimple patterns within the turbulent boundary layer (TBL), however, there is no significant change in the turbulence intensity in the TBL. The influence of dimple patterns is examined through the flow field survey near the flat plate trailing edge in terms of the profile drag. The wake flow velocities in the flat plate are measured by PIV technique. The maximum drag reduction rate is 4.6% at the Reynolds number of 10?~10?. The dimples tend to increase the dragr eduction rate consistently even at high Reynolds number range.
목차
Abstract
1. 서론
2. 실험 장치 및 실험 방법
3. 결과 및 고찰
4. 결론
후기
참고문헌
참고문헌 (10)
참고문헌 신청
1. [학술지(정기간행물)] - Bechert, D.W. / 2000 / Experiments with three-dimensional riblets as an idealized model of shark skin / Experiments in Fluids 28 (5) : 403 ~ 412
2. [학술지(정기간행물)] - Andrey V. Boiko / 2011 / Verification of drag-reduction capabilities of stiff compliant coatings in air flow at moderate speeds / International Journal of Naval Architecture and Ocean Engineering 3 (4) : 242 ~ 253
3. [학술지(정기간행물)] - Choi, H. / 1994 / Active turbulence control for drag reduction in wall bounded flows / Journal Fluid Mechanics 262 : 75 ~ 110
4. [학술지(정기간행물)] - Choi, J. / 2006 / Mechanism of drag reduction by dimples on a sphere / Physics of Fluids 18 (4) : 041702 ~
5. [학술지(정기간행물)] - Kang, Y.D. / 2008 / Direct intervention of hairpin structures for turbulent boundary-layer control / Physics of Fluids 20 (10) : 101517 ~
2. [학술지(정기간행물)] - Andrey V. Boiko / 2011 / Verification of drag-reduction capabilities of stiff compliant coatings in air flow at moderate speeds / International Journal of Naval Architecture and Ocean Engineering 3 (4) : 242 ~ 253
3. [학술지(정기간행물)] - Choi, H. / 1994 / Active turbulence control for drag reduction in wall bounded flows / Journal Fluid Mechanics 262 : 75 ~ 110
4. [학술지(정기간행물)] - Choi, J. / 2006 / Mechanism of drag reduction by dimples on a sphere / Physics of Fluids 18 (4) : 041702 ~
5. [학술지(정기간행물)] - Kang, Y.D. / 2008 / Direct intervention of hairpin structures for turbulent boundary-layer control / Physics of Fluids 20 (10) : 101517 ~
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UCI(KEPA) : I410-ECN-0101-2013-559-003484181