Accession Number : AD0782090

Title :   Measurements near Bluff Bodies in Turbulent Boundary Layers Intended to Simulate Atmospheric Surface Layers.

Descriptive Note : Interim rept.,

Corporate Author : ILLINOIS INST OF TECH CHICAGO DEPT OF MECHANICS MECHANICAL AND AEROSPACE ENGINEERING

Personal Author(s) : Tan-Atichat,Jimmy ; Nagib,Hassan M.

Report Date : MAY 1974

Pagination or Media Count : 186

Abstract : A relatively new counter-jet technique is shown to be suitable for producing thick turbulent boundary layers which may be used to simulate neutral atmospheric surface layers in wind tunnels of moderate length. The increased thickness is achieved by providing large momentum defects at the wall through upstream-oriented, spanwise-discrete wall jets, with changeable jet velocities and controllable jet angles. This technique permits rapid alteration of reproducible boundary layers from outside the tunnel while the experiments are in progress. (Modified author abstract)

Descriptors :   *Atmospheres, *Turbulent boundary layer, *Wind tunnel tests, Simulation, Flow fields, Velocity, Jet mixing Flow, Shear properties, Blunt bodies, Layers, Surface roughness, Test methods

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE