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Scour Induced by Single and Twin Propeller Jets

1
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China
2
First R&D Services, A-08-16 M Suites, 283 Jalan Ampang, Kuala Lumpur 50450, Malaysia
3
School of Natural and Built Environment, Architecture, Civil & Structural Engineering and Planning, Queen’s University Belfast, David Keir Building, Stranmillis Road, Belfast BT9 5AG, UK
*
Author to whom correspondence should be addressed.
Water 2019, 11(5), 1097; https://doi.org/10.3390/w11051097
Received: 27 April 2019 / Revised: 13 May 2019 / Accepted: 23 May 2019 / Published: 25 May 2019
(This article belongs to the Special Issue Experimental, Numerical and Field Approaches to Scour Research)
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Abstract

Single and twin ship propeller jets produce scour holes with deposition dune. The scour hole has a maximum depth at a particular length downstream within the propeller jet. Existing equations are available to predict maximum scour depth and the corresponding scour length downstream. Experiments conducted with various physical propeller models, rotational speeds, propeller-to-propeller distances and bed clearances are presented. The measurements allowed a better understanding of the mechanism of temporal scour and deposition formation for scour caused by single-propeller and twin-propeller. Results show that the propeller jet scour profiles can be divided into three zones, which are the small scour hole, primary scour hole and deposition dune. An empirical 2D scour model is proposed to predict the scour profile for both a single-propeller and twin-propeller using a Gaussian normal distribution. View Full-Text
Keywords: ship twin-propeller; jet; scour; 3D printing ship twin-propeller; jet; scour; 3D printing
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Cui, Y.; Lam, W.H.; Zhang, T.; Sun, C.; Hamill, G. Scour Induced by Single and Twin Propeller Jets. Water 2019, 11, 1097.

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