Function :
The pre-shrouded ducts are a type of hydrodynamic
energy-saving device installed in front of the ship's propeller,
which improves propulsion efficiency by optimizing the
propeller's inflow field. The core principle of the device lies in
the design of guide vanes with counter-rotating direction,
which induce pre-swirl in the water flow entering the propeller.
This pre-swirl flow is opposite to the direction of the propeller's
rotation, significantly reducing the rotational energy loss in the
propeller's wake. At the same time, the duct rectifies the inflow
across the upper half plane of the propeller, improving water
flow uniformity and reducing turbulence and vortex.
Features :
Outstanding economy: rapid return on investment and low annual maintenance costs.
Simple structure and convenient installation: Can be integrated into new ships during the design phase; for old ship retrofits, it can be quickly installed through positioning marks during docking.
Energy saving and consumption reduction: Achieves an average energy saving of 3-5% per unit
