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Other Devices - Coggle Diagram
Other Devices
Vane wheel
combined with propeller
FREELY rotating
Behind the propeller
Larger diameter
9% more efficient
Compared to Low-RPM high diameter
turning 20% lower RPM
Vane wheel gives 8% power saving
cavitation and hull pressure fluctuations
no big issue
diameter is small
linear veloc is small
Integrated Duct Propeller
Disadvantage
Erosion of
inner side of duct
Heavy implosion pressures of cavitation
Placed forward of propeller
Advantages
Decrease hull resistance
Flow stabilized towards propeller
Increase thrust
Asymmetrical duct with larger chord performs better than symmetrical
Cavitation
reduction in sheet
elimination of cloud
5% power saving
Reaction Fin
Introduce swirling flow
Forward of propeller
Counteract vortex
Best suited
to High Block Coefficient ships
4% to 6% power saving
sea trials
Objective
Energy Saving
