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Control effects of the flow and the aerodynamic force around the downstream cylinder by a spinning upstream cylinder in uniform flow

균일류의 회전원주 제어에 의한 유동 및 공력 제어효과에 관한 연구

  • 부정숙 (부산대학교 기계공학부, 기계기술연구소) ;
  • 양종필 (부산대학교 기계기술연구소) ;
  • 김창수 (부산대학교 대학원) ;
  • 신영곤 (현대자동차)
  • Published : 1998.03.01

Abstract

The aerodynamic forces and wake structure of the non-rotating downstream circular cylinder, of which the uniform freestream flow is interfered with another spinning upstream cylinder having the same diameter that is located upstream in a line have been investigated experimentally. When the spin rate of the downstream cylinder defined as the ratio of tangential surface velocity of the spinning cylinder to the freestream velocity increases gradually from zero to 1.4, the change of surface pressure distribution, aerodynamic forces of the non-rotating downstream cylinder were measured in case of several distance ratios of 1.5, 3.0, and 4.5 defined as the ratio of distance between the centers of two cylinders to the diameter. The wake flow patterns behind the cylinder were also investigated in each case. From the present experiments, it has been found that the spin rate significantly influences the aerodynamic forces and near-wake flow phenomena of the downstream cylinder in such a way that the drag increases as the spin rate and distance ratio increase and the wake width increases as the distance ratio increases.

Keywords

References

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