| Summary: | 碩士 === 國立臺灣海洋大學 === 系統工程暨造船學系 === 99 === A 3 kW ocean current generator will be designed and tested in large cavitation tunnel at NTOU(National Taiwan Ocean University). The propeller lifting line theory will be applied to design the turbine blade at 3.2 m/s current speed. The power generated by different diameters of turbine blade and its corresponding optimal revolutions will be calculated. The efficiency of three blades turbine is higher than that of two blades turbine. A three blades turbine with 0.8 m diameter can reach 3 kW. Due to the 6.2 rps low shaft rotational speed at design inflow speed, a planet gear is used to increase the speed 7 times. Thus, the torque and the size of the generator is reduced correspondingly.
The generator is submersible type, and cooling with the sea water. Because the planet gear is not watertight, the seals are important in order to keep watertight. Besides, a flexible coupling between gear and generator is installed to reduce the vibration. A power electronic system which can convert the generated power to 110 V and 60 Hz, will also be installed.
Besides, a mechanism which can make the generator always to direct to the inflow, is designed, in order to keep the best efficiency when the current direction is changed.
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