Abstract
The turbulent flowfield of three-dimensional turbulent free jet issuing from a two-dimensional (2-D) nozzle with multiple rectangular notches, has been investigated experimentally. The aim of this study is to manipulate a turbulent characteristic of the 2-D jet using multiple rectangular notches (Aspect Ratio=12.5) normal to the 2-D jet axis. The Reynolds number based on the nozzle width d and the nozzle exit velocity U_e was kept constant 25000, throughout this experiment. From this experiment, it was revealed that the attachment of the multiple rectangular notches to the 2-D jet restrained the increase of the turbulent energy at the jet center region on both the y and z axes in the upstream region. Furthermore, the present turbulent flowfield shows almost the same characteristics of the 2-D j et in the region x/d≧150.
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