摘要在今日，全世界都面临着日益严重的环境污染和能源紧缺的问题，找寻可持续绿色能源已成为能源开发研究的主题。波浪总是永不停止的拍打岸边，它们所包含的波浪能是一种取之不尽的可再生能源，人类有必要利用海洋资源。波浪发电是潮汐能发展后的海洋能源使用量最多的。现如今已经在研究开发的波浪发电装置基本上有三种类型：一个是振荡水柱型;二是机械式，利用波浪的运动推动装置的活动部分--鸭体、筏体、浮子等;三是水流型，采用收缩波将波浪引入高水位形成水位差，直接驱动涡轮发电机头。95182

本论文是利用基于黏性流体力学的CFD数值模拟方法，不仅可以计算浮子的垂荡运动下的载荷，还可以得到每一时刻的流场信息。在这项研究中，首先介绍CFD的基本理论，在此基础上建立数值波浪水池及浮子运动的CFD模拟方法，最后对三种底部形状的圆柱浮子进行三维时域模拟，分析底部形状对运动性能和俘获宽度比的影响，得到圆台底浮子从波浪中吸收能量并对外输出的能力优于半球底浮子，而半球底浮子又优于平底浮子，且输出功率会在一个合适的PTO阻尼系数下出现的结论；对垂荡运动下的浮子的运动和载荷进行探讨，得到圆台底可以改善浮子的垂荡运动性能且吸能效果明显优于平底浮子的结论；从流场的角度描述影响浮子运动幅值大小的原因，得到圆台底和半球底浮子对流体影响较平底浮子小的结论。

毕业论文关键词：波浪能、波浪能发电装置、数值水池、湍流模型。

Abstract Today, the world is facing increasingly serious environmental pollution and energy shortage problems, to find sustainable green energy has become the theme of energy development research。 Waves always stop the shore, they contain waves of energy is an inexhaustible renewable energy, human beings need to use marine resources。 Wave power generation is the most developed ocean energy use after tidal energy development。 There are basically three types of wave power generators already in research and development: one is the oscillating water column type; the second is mechanical, the use of wave movement to promote the activities of the device - duck body, raft, float, etc 。; Type, the use of shrink waves to the waves into the high water level to form a water level difference, direct drive turbine generator head。

This paper is based on the CFD numerical simulation method based on viscous fluid mechanics, which can not only calculate the load under the heave motion of the float, but also get the flow field information at each moment。 In this study, the basic theory of CFD is introduced firstly。 Based on this, the CFD simulation method of numerical wave pool  and float motion is established。 Finally, the three-dimensional time-domain simulation of three kinds of cylindrical shapes with bottom shape is carried out。 And the effect of the capture width ratio, the bottom of the bottom of the float from the wave to absorb energy and external output capacity is better than the hemisphere bottom float, and hemispherical bottom float is better than the bottom float, and the output power will be in a suitable PTO damping coefficient The results show that the motion and load of the float under the heave motion are discussed, and the dome motion of the float can be improved and the energy absorption effect is obviously better than that of the flat bottom float。 From the point of view of the flow field, The size of the reasons for the size of the bottom of the round and hemispherical bottom float on the impact of the liquid than the bottom of the small float conclusion。

Key words: wave energy, wave power generation device, numerical pool, turbulence model

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