Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
권호 표지
DOI QR코드

DOI QR Code

Study on the Drag Reduction of 2-D Dimpled-Plates

딤플을 적용한 평판에 대한 항력 감소 연구

  • 백부근 (한국해양과학기술원 선박해양플랜트연구소) ;
  • 편영식 (선문대학교) ;
  • 김준형 (선문대학교) ;
  • 김경열 (한국해양과학기술원 선박해양플랜트연구소) ;
  • 김기섭 (한국해양과학기술원 선박해양플랜트연구소) ;
  • 정철민 (국방과학연구소) ;
  • 김찬기 (국방과학연구소)
  • Received : 2012.05.22
  • Accepted : 2012.08.01
  • Published : 2012.08.20
Download PDF
⟨ Previous Next ⟩

Abstract

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 $10^6{\sim}10^7$. The dimples tend to increase the drag reduction rate consistently even at high Reynolds number range.

Keywords

References

  1. Bechert, D.W. Bruse, M. & Hage, W., 2000. Experiments with three-dimensional riblets as an idealized model of shark skin. Experiments in Fluids, 28(5), pp.403-412. https://doi.org/10.1007/s003480050400
  2. Boiko, Andrey V. Kulik, Victor M. Chun, H.-H. & Lee, I., 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), pp.242-253. https://doi.org/10.3744/JNAOE.2011.3.4.242
  3. Choi, H. Moin, P. & Kim, J., 1994. Active turbulence control for drag reduction in wall bounded flows. Journal Fluid Mechanics, 262, pp.75-110. https://doi.org/10.1017/S0022112094000431
  4. Choi, J. Jeon, W.P. & Choi, H., 2006. Mechanism of drag reduction by dimples on a sphere. Physics of Fluids, 18(4), 041702.
  5. Kang, Y.D. & Choi, K.S., 2008. Direct intervention of hairpin structures for turbulent boundary-layer control. Physics of Fluids, 20(10), 101517. https://doi.org/10.1063/1.3006346
  6. Kim, D.S. Kim, H.T. & Kim, W.J., 2003. Experimental Study of Friction Drag Reduction in Turbulent Flow with Microbubble Injection. Journal of the Society of Naval Architects of Korea, 40(3), pp.1-8. https://doi.org/10.3744/SNAK.2003.40.3.001
  7. Lee, S.J. Paik, B.G. Kim, G.B. & Jang, Y.G., 2006. Self-cleaning features of the plasma-treated surface with self-assembled monolayer coating. Japanese Journal of Applied Physics, 45(2A), pp.912-918. https://doi.org/10.1143/JJAP.45.912
  8. Park, J. & Choi, H., 1999. Effects of uniform blowing or suction from a spanwise slot on a turbulent boundary layer flow. Physics of Fluids, 11(10), pp.3095-3105. https://doi.org/10.1063/1.870167
  9. Pyoun, Y.S. et al., 2010. Tribological characteristics of radial journal bearings by ultrasonic nanocrystalline surface modification technology. International Journal of Modern Physics B, 24(15-16), pp.3011-3016. https://doi.org/10.1142/S0217979210066008
  10. Seoudi, B.M. Boiko, A.V. Chun, H.H. & Lee, I.W., 2008. Measurement Method of Broadband Dynamic Characteristics of Viscoelastic Material for Compliant Coating. Journal of the Society of Naval Architects of Korea, 45(1), pp.73-80. https://doi.org/10.3744/SNAK.2008.45.1.73

Cited by

  1. Improvement in Mechanical and Wear Properties of WC-Co by Ultrasonic Nanocrystal Surface Modification Technique vol.31, pp.2, 2015, https://doi.org/10.9725/kstle.2015.31.2.56