DOI QR코드

DOI QR Code

Drag reduction of a disk with an upstream rod

  • Zhang, Panfeng (Institute of Fluid Mechanics, Beijing University of Aeronautics & Astronautics) ;
  • Gao, Lei (Institute of Fluid Mechanics, Beijing University of Aeronautics & Astronautics) ;
  • Wang, Jinjun (Institute of Fluid Mechanics, Beijing University of Aeronautics & Astronautics)
  • 투고 : 2005.11.03
  • 심사 : 2006.04.21
  • 발행 : 2006.06.25

초록

The pressure and drag measurements were carried out in the wind tunnel to investigate the drag reduction of the disk by using an interference rod placed upstream. The results indicate that there is a pair of standing vortices in the front stagnation region of the disk induced by the rod. The standing vortices can decrease the pressure on the disk upwind side; hence it can reduce the drag of the disk. With an increasing rod diameter, the standing vortices are strengthened and more drag reduction can be achieved for the disk. With rod diameter d/D = 0.05 (d, D are the diameters of rod and disk, respectively), the total drag of the disk can be reduced by about 9% compared with that of the bare disk.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

  1. Cannon, S., Champagne, F., and Glezer, A. (1993), 'Observations of large-scale structures in wakes behind axisymmetric bodies', Experiments in Fluids, 14, 447-450 https://doi.org/10.1007/BF00190199
  2. Hoerner, S. F. (1965), 'Fluid-dynamic drag', published by the author, Midland Park, NJ
  3. Igarashi, T. (1997), 'Drag reduction of a square prism by flow control using a small rod', J. Wind Eng. Ind. Aerodyn., 69-71, 141-153
  4. Johari, H. and Stein, K. (2002), 'Near wake of an impulsively started wake', Physics of Fluids, 14(10) 3459-3474 https://doi.org/10.1063/1.1502267
  5. Kiya, M., Ishikawa, H., and Sakamoto, H. (2001), 'Near-wake instabilities and vortex structures of three-dimensional bluff bodies: A review', J. Wind Eng. Ind. Aerodyn., 89, 1219-1232 https://doi.org/10.1016/S0167-6105(01)00160-X
  6. Lesage, F. and Gartshore, I. S. (1987), 'A method of reducing drag and fluctuating side force on bluff bodies', J. Wind Eng. Ind. Aerodyn., 25, 229-245
  7. Lian, Q. X. and Su, Z. Z. (1993), 'The standing vortex in the front stagnation region of square plate induced by the fine interference wire', Science in China(Series A), 23(17), 1171-1177
  8. Miau, J. J., Leu, T. S., Kiu, T. W., and Chou, J. H. (1997), 'On vortex shedding behind a circular disk', Experiments in Fluids, 23, 225-233 https://doi.org/10.1007/s003480050106
  9. Prasad, A. and Williamson, C. H. K. (1997), 'A method for the reduction of bluff body drag', J. Wind Eng. Ind. Aerodyn., 69-71, 155-167
  10. Slaoutiand, A. and Stansby, P. K. (1992), 'Flow around two circular cylinders by the random-vortex method', J. Fluids Struct., 6, 641-670 https://doi.org/10.1016/0889-9746(92)90001-J
  11. Wang, J. J., Guo, H., Lian, Q. X., and Choi, K. S. (2005), 'The generation of large counter-rotating vortex pair by a very weak shear layer', submitted to Physics of Fluids
  12. Wang, J. J., Zhang, P. F., Lu, S. F., and Wu, K. (2006), 'Drag reduction of a circular cylinder using an upstream rod', Flow, Turbulence and Combustion, 76(1), 83-101 https://doi.org/10.1007/s10494-005-9008-0
  13. Zdravkovich, M. M. (1977), 'Review of flow interference between two circular cylinders in various arrangements', J. Fluids Eng., 199, 618-633
  14. Zhang, P. F., Wang, J. J., Lu, S. F., and Mi, J. (2005), 'Aerodynamic characteristics of a square cylinder with a rod in staggered arrangement', Experiments in Fluids, 38(4), 494-502 https://doi.org/10.1007/s00348-005-0936-1

피인용 문헌

  1. Numerical simulation of flow around cylinder with an upstream rod in tandem at low Reynolds numbers vol.28, pp.3, 2006, https://doi.org/10.1016/j.apor.2006.08.003
  2. Evaluation of base shield plates effectiveness in reducing the drag of a rough circular cylinder in a cross flow vol.11, pp.5, 2008, https://doi.org/10.12989/was.2008.11.5.377