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Wind and Structures
  Volume 9, Number 3, May 2006, pages 245-254

Drag reduction of a disk with an upstream rod
Panfeng Zhang, Lei Gao and Jinjun Wang

    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.
Key Words
    drag reduction; disk; interference rod; pressure measurement.
Institute of Fluid Mechanics, Beijing University of Aeronautics & Astronautics, Beijing,10083, P. R. China

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