Abstract
The paper focuses on the performance of floating buoys of a wave power generating jack-up platform called Haiyuan 1, in order to work out the optimum designed draft and hydraulic pressure. The performance of the buoy, especially its delivered power, is an important issue in designing oscillating buoy wave energy converter. In this case, major factors affect the performance including incident wave, designed draft, and hydraulic pressure on the buoy. To find out the relationship among design draft, hydraulic pressure, and delivered power, the key point is to precisely estimate wave induced motion of the buoy. Three-dimensional theory and time domain method based on potential theory were adopted in the paper. Unlike ship and other floating structures, motion of wave energy converter (WEC) buoy in wave will be weakened because of energy take-off, which will cause significant draft changing with time. Thus, draft changing should be taken into consideration as well. In addition, green water problem occurs more frequently than that in ship and other floating structures and also might the reduce delivered power. Therefore, green water problem will also be taken into account when choosing the optimum designed draft and hydraulic pressure. The calculation indicates that the optimum designed draft is 0.935 m, while the optimum designed hydraulic pressure is 30 kN.
Highlights
The ocean reserves extremely huge wave energy, which is as high as 103 to 104 GW [1]
Great progress has been reached in the field of wave energy utilization; even some wave power generating stations had become commercialized
The motion of the wave energy converter (WEC) buoy might greatly be attenuated, which will induce the draft of the buoy changing greatly, so the result is that hydrodynamic coefficients changing with time and unbalance of buoyance and gravity
Summary
The ocean reserves extremely huge wave energy, which is as high as 103 to 104 GW [1]. Falcao et al simulated the hydrodynamics of an oscillating buoy absorbing energy from sea waves by using time domain method and three-dimension theory [12]. It seems that most of the authors calculated the related hydrodynamic coefficients at the mean draft and assumed that buoyance is always equal to gravity, instead of taking the effect of draft changing into consideration. The motion of the WEC buoy might greatly be attenuated, which will induce the draft of the buoy changing greatly, so the result is that hydrodynamic coefficients changing with time and unbalance of buoyance and gravity. The results of computation and some conclusions are going to be revealed in Sections 4 and 5
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