Development of New Wave Absorbing System for Wave Power Extraction and Shore Protection

人们提出了一种新的海岸结构，它可以将波浪能转化为电能，同时也可以作为独立的防波堤，保护沙滩免受侵蚀。采用二维和三维波浪槽试验和与旋转叶片泵性能有关的现场试验对其进行了检验。1)确定了系统的截面构型，将入射波功率分别分配为反射波功率的20%、40%和10%，吸收波功率分配为透射波功率。2)采用摆板宽度为1.5的三组结构进行三维试验，结果表明，由于衍射波穿过间隙的影响，反射吸收比小于图1)，透射比高于图1)。3)改进后的旋片泵在现场试验中表现出良好的性能，当波浪大于0.4 m时，从入射波到发电机轴的总效率为0.45。4)该系统在太平洋沿岸的发电成本估计为46 (\/kWh)，总成本估计为34（\/kWh）。总成本将低于风力发电，但仍是燃油发电成本的1.4倍。

A new coastal structure has been proposed which extracts wave power to electricity as well as acts as a detached breakwater to protect sandy shores from erosion. It has been examined employing two and three dimensional wave tank experiments and a field experiment related to a rotary vane pump capability.1) The cross sectional configuration of system were determined so as to allocate the incident wave power to 20, 40 and 10 % of it to the reflected, absorbed and transmitted power, respectively.2) The three dimensional test with a group of three structures each of which locates 1.5 pendulum plate width showed that less reflected and absorbed ratios and higher transmitted ratio than the figures of 1) due to diffracted wave effect through the gaps.3) The rotary vane pump improved has shown a good capability at field test and the overall efficiency from incident wave to generator shaft is 0.45 for waves higher than 0.4 m.4) The cost of electricity with the system is estimated 46 ( \/kWh) for generation cost and 34( \/kWh) for the total cost at the pacific coasts in Kantou area. The total cost will be lower than that of wind power though it still 1.4 times of the cost by oil-fired power.