中文摘要：

为了更加切合实际地研究鸭式波浪能转换装置的水动力特性及效率,考虑了鸭式装置可绕定轴转动以及装置的附加质量和附加阻尼,以ANSYS14.0软件为平台建立二维数值波浪水槽,对装置在不同波浪条件作用下的受力情况与运动情况进行了数值模拟与分析。结果表明：（1）在相同波高条件下,随着波浪周期的增大,装置受到的水动力力矩增大,转换效率下降,转换效率最高可达到70%;（2）在相同周期条件下,随着波高的增大,鸭式装置受到的水动力力矩也随之增加,波浪在经过装置后波高会发生衰减;（3）装置转换效率总体可维持在70%左右,但由于波峰到达装置时会有部分波浪从其顶部越过,随着波浪波高增大转换效率缓慢下降。为该装置的实际应用提供理论支持。

英文摘要：

In order to study the hydrodynamic characteristics and efficiency of the Nodding Duck wave power device in more practical way, a two-dimensional numerical wave tank is established based on the platform of ANSYS14.0 software. What is new is that device rotation, added mass and added damping are taken into account.The force and movement of the Duck are simulated and analyzed under different wave conditions. The simulation results show that（1） with increasing wave period under the condition of the same wave height, the maximum hydrodynamic torque of the device increases, while energy harvesting efficiency decreases, but the efficiency can reach 70%;（2） with increasing wave height under the condition of the same wave period, the hydrodynamic torque of the device also increases, with wave height obviously reduced when waves pass through the device;（3）the efficiency is generally maintained at about 70%, but some waves will climb over the top when waves reach the device, and hence, the efficiency decreases slowly with the increase of wave height. Therefore, the study presented in this paper will provide theoretical support for the practical application of the device.