Abstract
Experiments were conducted to investigate the seabed scour holes due to the interaction between the twin-propeller jet and quay wall. Vertical quay wall was modelled by using a polyvinyl chloride (PVC) plastic plate in a water tank. The relationship between the positions of the propeller and the vertical quay wall was designed according to the actual working conditions of a ship entering and leaving a port. Propeller-to-wall distance and rotational speed were changed to observe the various scour conditions. The scour depth was measured by using an Acoustic Doppler Velocimeter (ADV). Primary scour hole was found within the jet downstream and secondary scour hole occurred beneath of the propeller. Third scour hole was found close to the quay wall due to horseshoe vortices. The maximum scour position of this third scour hole was found at the jet centre near the quay wall. Temporal formation of scour holes can be divided into three stages: axial scour formation, obstructed scour expansion and equilibrium stages. The quantitative relationships for six characteristic parameters of the scour pit were established including the maximum scour depth (εmax,q), maximum scour depth position (Xm,q), maximum scour width (Wm,q), length of main scour pit (XS,q), maximum deposition height (ZD,q), and location of maximum deposition height (XD,q).
Highlights
The carrying capacity and high-speed performance of ships are increasing with the development of the marine economy and trade
In this study, based on a previous experimental study of a single propeller combined with three-dimensional printing technology, the scouring of a vertical quay wall induced by a twin-propeller jet was investigated using an acoustic Doppler velocimeter (ADV)
The structure could be divided into small scour pits, main scour pits, and local scour zones near the quay wall
Summary
The carrying capacity and high-speed performance of ships are increasing with the development of the marine economy and trade. Jiang et al [10] developed a twin-propeller model and simulated the jet flow field of the twin-propeller using a standard k–ε model to predict the distribution of twin-propeller-jet flow field Propeller scour is another crucial research topic for engineering safety. Hong et al [20], Wei and Chiew [21], and Wei et al [22] examined local scour pits near the toe of a slope They found that the maximum scour depth initially increases and decreases with the toe clearance (longitudinal distance between the propeller and wall) until the wharf effect is no longer significant. In this study, based on a previous experimental study of a single propeller combined with three-dimensional printing technology, the scouring of a vertical quay wall induced by a twin-propeller jet was investigated using an acoustic Doppler velocimeter (ADV). The scour simulation of ships used in practical engineering, especially the most common vertical port structure, was conducted
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