NEAR-WAKE OF A CIRCULAR CYLINDER: CONTROL BY STEADY AND UNSTEADY SURFACE INJECTION

Control of the vortex formation from a cylinder is achieved by steady blowing and unsteady blowing-suction through very small holes arranged in a helical pattern on the surface of the cylinder. Use of high-image-density particle image velocimetry allows characterization of the instantaneous, global structure of the near- wake. The instantaneous and averaged states of the wake are related to the dimensionless magnitudes of blowing and blowing- suction; substantial alterations of the wake structure are attainable. When this type of control is applied simultaneously with oscillatory motion of the cylinder, however, the effects of the cylinder motion become dominant, even at relatively low amplitudes of oscillation, and the near-wake structure regresses to a form similar to that occurring in the absence of surface injection.

  • Supplemental Notes:
    • J Fluids and Structures, v 9 n 6, Aug 1995, p 659 [20 p, 18 ref, 10 fig]
  • Authors:
    • Lin, J C
    • Towfighi, J
    • Rockwell, D
  • Publication Date: 1995

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00717673
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Mar 4 1996 12:00AM