S053024 Flow Characteristics of a Plane Jet with Deflectors inside the Nozzle : Effects of serrated tabs

Abstract

The flow characteristics of a plane air jet have been investigated experimentally. Two deflectors were installed inside of plane nozzle and their slant angles were 6°. Serried isosceles triangle tabs were placed on the upper and lower side of the nozzle exit. The effects of serrated tabs and deflectors on the mean and fluctuating velocities were examined by means of hot-wire measurements. The operating velocity of the jet was fixed at 7.4 m/s. The half width of the plane jet with serrated tabs was smaller than that without serrated tabs due to the contracted flow. The half widths of the jet with divergent or convergent deflectors and serrated tabs were also smaller than that without serrated tabs near the nozzle exit. The plane jet with serrated tabs was observed the predominant frequency as well as that without serrated tabs. The jet with divergent or convergent deflectors and serrated tabs was not observed apparent predominant frequency.