A New Type of Ship Energy-Saving Device...FPHFS : Fore-Propeller Hydrodynamical Fin Sector
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概要
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The fore-propeller hydrodynamical fin sector (FPHFS) is a new type of energy-saving device developed by MARIC recently. It is composed of 2 or 3 radially placed hydrodynamical fins of aerofoil section and installed at an appropriate position before propeller. The inflow state of propeller and the propulsive efficiency of ship may be improved through the installation of FPHFS. In this paper, model tests and trial results of two versions of 1942kW twin screw river pusher, Version I with reduction gear and Version II without are presented. Within the service speed range, the trial results are quite close to the predicted energy-saving rate (ESR) obtained from model tests. With the installation of FPHFS, the ESRs form Version I pushing a total of 13,000 dwt bargeload plus 4,000t lightship weigh varies from 3.4% at 14km/h to 6,4% at 12km/h ; and those for Version II, pushing 12,000 dwt bargeload plus 4,000t lightship weight from 3.8% at 13km/h to 7.0% at 11km/h, both with derated engine power by reducing an average of 2.3% in rpm. In case when the main engine rpm were kept unchanged, speed increase from 0.15 to 0.35km/h were recorded, which means more trips per year are possible provided the operational schedule be modified accordingly. FPHFS may be easily installed on both new-built and existing inland ships, tugs and pushers. The energy-saving rates are found to be satisfactory. It is estimated that the total cost of model research and FPHFS installation will be covered within a few months for a fleet of 10 sister ships.
- 1992-09-25