Abstract
Ocean energy has a potential of providing a large amount of renewable energy around the world. One of the forms of ocean energy, tidal stream power is widely recognized as the continuous, predictable and eco-friendly ocean energy source. Unique tandem propellers that can counter-rotate have been designed to generate electric power effectively from a tidal stream. This type of power unit has several advantages compare to the conventional unit with a single propeller. At the design of the tidal stream power unit, it is important to investigate the structure of the tip vortex tubes shedding to predict the load of the propeller. In this research, we investigated the tip vortex shedding using the CFD method for the conventional single propeller and counter-rotating type tandem propellers and estimated the performance efficiency using RANS (Reynolds Averaged Navier-Stokes) model and we confirmed the limitation of RANS model on the calculation of the tip vortex stretching.
Highlights
Global warming is a big problem around the world
We investigated the tip vortex shedding using the CFD method for the conventional single propeller and counter-rotating type tandem propellers and estimated the performance efficiency using RANS (Reynolds Averaged Navier-Stokes) model and we confirmed the limitation of RANS model on the calculation of the tip vortex stretching
The counter-rotating type propeller has a higher efficiency than the single propeller and it is applicable for a wide range of tip speed ratio
Summary
Global warming is a big problem around the world. Due to an increasing demand in clean energy and rising fuel prices, more research is focused on renewable energy resources. Tidal stream energy is one type of renewable energy. Among many renewable energy sources, tidal stream energy is continuous, predictable and eco-friendly ocean energy. Tidal stream is caused by the flood and ebb of a tide due to the gravitational pull of the moon. The tidal stream power unit is placed in the path of tidal stream to generate electricity, which generates electricity by converting the horizontal tidal current flow into the rotational motion using propeller and generator
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