Experiments on Management of Free-Stream Turbulence
ILLINOIS INST OF TECH CHICAGO
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The effects of various passive devices screens, perforated plates, porous foam, and honeycomb-like matrices formed with closely packed plastic drinking straws on free-stream turbulence and mean velocity profiles are studied in air with hot-wire anemonetry 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 andor modify the incoming turbulence flow to yield the one appropriate to the application.
- Test Facilities, Equipment and Methods