AHFID Propulsor Performance Prediction
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
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The thrust and torque of the propulsor tor the Advanced Hull Form Inshore Demonstrator were predicted using a vortex lattice propeller code coupled with an Euler solver. The propulsor is a post-swirl ducted unit with the rotor band recessed into the duct inner surface. To predict the additional torque due to the recessed band, empirical methods were used. The demonstration-scale propulsor is predicted to absorb 2360 hp 1760 kW and produce a net thrust of 19,200 lbs 85.4 kN at the design condition of 26 knots, 325 rpm. At the motor torque limit of 33,350 ft-lbs 45.2 kN-m and the design advance ratio, the unit is predicted to achieve 24.3 knots at 303 rpm. The effect of the band was found to be significant. The band contributes 4 to the total rotor torque. The thrust on the band increases the rotor thrust but does not affect the net thrust of the unit.
- Marine Engineering