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Mixing Characteristics of 45° Inclined Duckbill Dense Jets in Co-Flowing Currents

Author(s): Mingtao Jiang; Wei Chen; Adrian Wing-Keung Law

Linked Author(s): Wing Keung, Adrian Law

Keywords: Inclined dense jet; Planar Laser Induced Fluorescence (PLIF); Duckbill valve; Co-flows

Abstract: An experimental investigation was conducted using the technique of Planar Laser Induced Fluorescence (PLIF) to examine the mixing characteristics of 45° inclined dense jets from a duckbill shape nozzle in co - flowing currents. The characteristics of duckbill jet, including concentration decay, centreline peak dilution and cross-sectional concentration distribution were investigated. The influence of two mounting orientations of the duckbill nozzle, namely vertical and horizontal, were also analyzed. The experimental results showed that two regimes, namely dense-jet- and co-flow-dominated, can be observed. Comparing to the available results in the literature for inclined circular dense jets, the centreline peak dilution for inclined duckbill dense jets is generally higher. With respect to the mounting orientation, the horizontal induces a relatively higher dilution but also a larger centreline peak height. Thus, the horizontal orientation would be preferable when the cover water depth is sufficient.


Year: 2020

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