The effects of various passive devices (screens, perforated plates, porous foam, and honeycomblike matrices formed with closely packed plastic drinking straws) on free-stream turbulence and mean velocity profiles are studied in air with hotwire anemometry and in water using hydrogen-bubbles visualization. These 'turbulence manipulators' are viewed as operators which suppress the level of the incoming turbulence and generate, primarily through documented instabilities, new turbulences with scales characteristic of the device and its shear layers. In this sense these manipulators can be used to control, manage and/or modify the incoming turbulence flow to yield the one appropriate to the application.

  • Corporate Authors:

    Illinois Institute of Technology

    3300 South Federal Street
    Chicago, IL  United States  60616-3793
  • Authors:
    • Loehrke, R I
    • Nagib, H M
  • Publication Date: 1972-9

Media Info

  • Pagination: 113 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00041732
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: AFOSR-TR-72-0077
  • Contract Numbers: F44620-C-0022
  • Files: TRIS
  • Created Date: Mar 19 1973 12:00AM