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dc.contributor.authorHong, Jian-Haoen_US
dc.contributor.authorYeh, Po-Hungen_US
dc.contributor.authorChiew, Yee-Mengen_US
dc.identifier.citationHong, J., Yeh, P. & Chiew, Y. (2020). Prediction of mean axial velocity of a free turbulent propeller jet. Journal of Hydraulic Engineering, 146(3), 04019070-.
dc.description.abstractSwirling jets induced by propellers have a significant impact on riverine and marine environments. Erosion around quay structures and contaminant dispersion in harbors or along navigation channels are examples of these effects. Simulating propeller-induced jet velocities that extend from near to far fields is the first step in elucidating this phenomenon and seeking solutions. Most previous investigations have proposed semiempirical equations for estimating velocity. Different formulas have been derived for velocity in both the zone of flow establishment and in the zone of established flow. In this study, the mean and turbulent flow fields downstream from a rotating propeller were investigated using an acoustic Doppler velocity profiler (ADVP). The results showed that the propeller-induced swirling effect was directly proportional to the propeller rotational speed, but decreased as the distance from the efflux plane increased. However, this effect has little effect on the radial distribution of the axial mean velocity and the decay of the maximum velocity. A point-source method was employed, along with the adjustment of the jet axial momentum spreading coefficient, to provide an analytical solution for the axial mean velocity within the propeller jet. Comparisons with measured data from the published literature and from the present study for both flat and equilibrium scour beds showed good agreement. Based on results of this study, the axial velocity profile calculated using the point-source method may be applied to investigate the scour and sediment resuspension induced by a propeller jet.en_US
dc.description.sponsorshipMaritime and Port Authority of Singapore (MPA)en_US
dc.relation.ispartofJournal of Hydraulic Engineeringen_US
dc.rights© 2020 American Society of Civil Engineers. All rights reserved.en_US
dc.subjectEngineering::Civil engineeringen_US
dc.titlePrediction of mean axial velocity of a free turbulent propeller jeten_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.subject.keywordsSwirl Numberen_US
dc.subject.keywordsPropeller Jeten_US
dc.description.acknowledgementFinancial support provided by the Water and Environment Research Centre and Education Hub (DHI-NTU Centre), Hamburg Port Authority (HPA), and the Maritime and Port Authority of Singapore (MPA) to set up the experiment is gratefully acknowledged.en_US
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