结合防波堤的振荡摇摆式波浪能装置试验研究

讨论一种结合防波堤的振荡摇摆式波浪能装置的结构和工作原理,并在河海大学河口航道综合试验厅进行物理模型试验。试验以重块和不锈钢板间的摩擦力作为波浪能转换装置的负载阻尼,通过测量不锈钢板两端的拉力及其位移计算波浪能转换输出功率。结果表明,当入射波的周期和浮体的固有周期接近时,浮体的运动接近共振状态,此时波浪能转换平均输出功率和转换效率最高,分别可达0.05 W和17.9%。入射波周期较大时,装置的波浪能转换输出功率较高,但此时其波浪能转换效率低于入射波周期较小时。水深对于浮体的姿态和运动特性起到关键作用,结果表明水深为60 cm时波浪能转换输出功率和转换效率最高。

EXPERIMENTAL STUDY ON OSCILLATING FLAP-TYPEWAVE ENERGY DEVICE INTEGRATED WITH BREAKWATER

This paper presents the structure and working principle of an oscillating flap-type wave energy device integrated with a breakwater.The physical model tests were carried out in the comprehensive laboratory of estuary and waterway at Hohai University.The friction force between a heavy block and a stainless steel plate was employed as the damping load for the developed device.Then,the output power can be estimated conveniently using the tension forces and the displacement of steel plate measured during model tests.The experimental results show that the float installed in front of the breakwater is in the resonance state when the incident wave period is close to the natural period of the float,during this time the average output power and conversion efficiency of the wave energy device are the highest,up to 0.05 W and 17.9%,respectively.When the incident wave period is larger,the energy conversion efficiency is lower than those under incident waves of smaller periods,though the average output power is high for longer waves.Additionally,water depth plays a key role in determining the posture and motion characteristics of the float.This study finds that,the average output power and energy conversion efficiency are more satisfactory when the water depth is 60 cm.