In order to meet the requirements of the energy efficiency existing ship index(EEXI)and achieve the purpose of energy conservation and emission reduction,based on the basic theory of hydrodynamics,an energy-saving device of the pre-swirl fairings in front of propellers is designed.The device consists of accelerated ducts and guide vanes.The accelerated ducts keep the water flow to close to the hull,improve the flow separation,and make the water flow into the propeller more uniform,thereby increasing the propeller propulsion efficiency.The guide vanes can provide the pre-swirl flow for the propellers to reduce energy loss.The computational fluid dynamics(CFD)software is used to compare and analyze the stern flow field and wake distribution before and after optimization.Through combination and optimization of the design parameters of the energy-saving device,the energy-saving effect can reach 7.96％.It is proved that the energy-saving device design of the pre-swirl fairings in front of propellers by CFD software is feasible.
pre-swirl fairing in front of propellercomputational fluid dynamics(CFD)energy-saving devicenumerical simulation
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