| 摘要 |
A drag reducing arrangement comprises a vortex generating rotor cone 80 having twisted ducts formed in its outer surface and a channel ducted stator means 81. The channel ducted stator means is provided with vanes 82 that define longitudinal channels that receive the vortex produced by the rotor cone and forms a series of drag reducing counter rotating vortex ring pairs (15, Fig 1). The arrangement can be used in a marine propulsion system (Figure 1) to reduce the turbulent drag of known propeller drive systems. It can also be used as a propulsor pod system (Figure 5) for use on a large vessel, for locating within a modified bow bulb to reduce drag and increase fuel efficiency. The arrangement can also be used for locating both fore and aft in a fully submersible vessel (Figure 6) as an inboard system to increase stealth and reduce drag respectively.
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