Investigation of Navigation Performance and Jet Flow Characteristics of Water-jet Propulsion Vessel in Shallow Water
The effect of shallow water on the navigation performance and jet flow characteristics of water-jet propulsion vessel is investigated,The navigation state of water-jet propulsion vessel and the patterns and mechanisms of jet flow under the conditions of different water depths are analyzed through numerical simulation.A numerical simulation method for the self-propulsion characteristics of water-jet propelled vessel is established using the Reynolds-averaged Navier-Stokes(RANS)equations to study the effect of water depth on the flow field around the vessel,jet flow morphology,and turbulence energy distribution.A regression prediction model for predicting the vessel behavior and jet flow characteristics is developed based on numerical calculations of vessel behavior and nozzle flow rates in different water depths.Results indicate that the shallow water blocking effects intensify as water depth decreases,increasing the differential pressure beneath the vessel and the stern inclination angle,while also increasing the recirculation velocity and draft around the hull.Additionally,the bow wave system grows and interacts with the stern wave system,leading to increased energy dissipation.The intersection point of jet flow and stern waves shifts forward with the decrease jn water depth,thus increasing the radial diffusion and vorticity,and decreasing the propulsive power,while increasing turbulence energy and water disturbance.These findings provide a scientific basis for the practical application of water-jet propulsion technology in shallow water conditions to improve the efficiency and safety of water-jet propelsion vessels in complex aquatic environments.
Propulsion vesselwater-jet propulsionshallow water conditionnavigation performancejet flownumerical simulation
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