WED – Wake Equalizing Duct
Loewe Marine’s high energy efficiency wake equalizing duct (LHE-WED)
Wake Equalizing Duct = WED is a system for the improvement of ship propulsion and performance economy
WED-fiiting can be done from New Building or as retrofit.
- Reduction of fuel oil consumption 3-8%
- Reduction of vibrations by about 50%
- Can be done afloat – No docking needed
The main advantage lies in power saving, which results from various effects.
These may be differentiated as follows:
- Improvement of propeller efficiency from more axial flow and more equal velocity distribution over the disc area.
- Reduction of flow separation at the after body. This effect is most prevalent and finds expression in reduction of thrust deduction fraction.
- Generation of lift with a forward force component on the aerofoil section in a similar way though not as exaggerated as in the Kort-duct.
- Uniform flow reduces propeller excited vibrations.
- Reduction of propeller excited vibrations from decreased propeller tip loading in upper quadrants.
- Improvement of steering qualities from more straightened flow to the rudder. In spade rudders the longer upper sections become more effective from higher flow velocity.
- Improvement in course keeping ability from increased lateral plane area aft.
- No constructional changes and no modifications in propeller design are involved when the duct is fitted subsequently to an existing ship
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