海上风电Spar浮式基础运动特性研究

发布时间：2018-03-23 18:07

本文选题：海上风电浮式基础　切入点：Cell　出处：《华南理工大学》2014年硕士论文

【摘要】：随着大型海上风机技术的快速发展，海上风力发电已成为未来风能利用的新趋势。然而当前正蓬勃发展的固定式海上风电场与近海旅游、港口建设、既定航线、湿地保护等诸多既有海洋开发规划存在冲突，且受到水深的限制，面临着严重的发展瓶颈。因而未来海上风力发电必走向深蓝，发展浮式基础支撑式深水大型风电场具有现实意义。然而，海上风电浮式基础所处海洋环境复杂，，大型海上风力发电机组结构重量大和重心偏高，且运转时会传递的巨大的风倾力矩，这导致了研发能够为大型海上风机正常工作提供稳定支撑，运动性能优越且经济可靠的海上风电浮式基础极具挑战性。本文将海上采油平台Cell Spar的结构设计理念引入到海上风力发电浮式基础的研发中，提出了海上风电Cell Spar浮式基础的概念设计，并展开了浮式基础运动特性的深入研究，为海上风电Cell Spar浮式基础的优化设计和运动特性研究提供了理论保证和技术支持。首先基于三维频域势流理论，针对垂荡板数量、水深、重心高度的变化对CellSpar浮式基础的水动力性能的影响进行深入探究；通过与原型Spar模型比较，验证CellSpar的水动力性能，并为采用原型Spar进行基于粘性流理论的运动特性研究提供依据。接着，研究了浮筒式悬链线系泊系统与传统悬链线系泊系统的时域运动耦合响应，得出浮筒式悬链线系泊系统的更适合海上风电Cell Spar浮式基础的结论。基于此考虑不同风速、浪高和浪向对该系泊系统的影响，并对极端海况下系泊缆断裂后对系泊系统的影响进行分析研究。然后，基于三维波浪数值水池模型技术，建构了基于粘性流理论的波浪与海上风电Cell Spar浮式基础相互作用的数值模拟计算体系，对规则波作用下Cell Spar浮式基础的流场、受力以及运动响应进行分析。最后，发展了基于粘性流理论的全尺寸海洋平台及海洋浮式结构物的强迫振荡运动试验数值水池技术，分别研究了垂荡板和海上风电Cell Spar浮式基础在强迫振荡运动过程中的流场和受力等运动特性，研究结果表明海上风电Cell Spar浮式基础粘性阻尼并不随着垂荡板的数量增加而线性增加，且受到Spar浮式基础的硬舱和软舱遮蔽作用而衰减。这为后续的垂荡板优化提供理论支持，为海上风电浮式基础的垂荡性能预估提供了一种新的思路和方法。
[Abstract]:With the rapid development of large-scale offshore wind turbine technology, offshore wind power generation has become a new trend of wind power utilization in the future. However, the current vigorous development of fixed offshore wind farms and offshore tourism, port construction, established routes, Many existing marine development plans, such as wetland protection, are in conflict with each other, and are restricted by water depth and face serious development bottlenecks. Therefore, in the future, offshore wind power generation will go deep blue. It is of practical significance to develop the floating foundation supported deep water large-scale wind farm. However, the offshore wind power floating foundation is located in a complex marine environment, the structure of large offshore wind turbine is heavy and the center of gravity is on the high side. And the huge wind tilting torque will be transmitted when running, which leads to the development of offshore wind power floating foundation which can provide stable support for the normal operation of large offshore wind turbines. In this paper, the concept of structure design of offshore Cell Spar is introduced into the research and development of floating foundation of offshore wind power generation, and the concept design of floating foundation of offshore wind power Cell Spar is put forward, and the motion characteristics of floating foundation are studied deeply. This paper provides the theoretical guarantee and technical support for the optimization design and the research of motion characteristics of the floating foundation of Cell Spar in offshore wind power. Firstly, based on the theory of potential flow in three dimensional frequency domain, aiming at the number of sagging plates and the depth of water, The influence of the height of center of gravity on the hydrodynamic performance of CellSpar floating foundation is deeply explored, and the hydrodynamic performance of CellSpar is verified by comparing with the prototype Spar model. It also provides the basis for the study of kinematic characteristics based on viscous flow theory by using the prototype Spar. Secondly, the time-domain kinematic coupling response between the buoy catenary mooring system and the traditional catenary mooring system is studied. The conclusion that the mooring system of buoy catenary is more suitable for the floating foundation of Cell Spar in offshore wind power is obtained. Based on this, the influence of different wind speed, wave height and wave direction on the mooring system is considered. The effect of mooring cable breaking on mooring system under extreme sea conditions is analyzed. A numerical simulation system of wave interaction with Cell Spar floating foundation of offshore wind power is constructed based on viscous flow theory. The flow field, force and motion response of Cell Spar floating foundation under regular wave action are analyzed. Based on the viscous flow theory, a numerical tank technique for the forced oscillatory motion test of a full-scale offshore platform and a floating offshore structure is developed. The characteristics of flow field and force during forced oscillation of floating foundation of offshore wind power Cell Spar and sagging plate are studied, respectively. The results show that the viscous damping of floating foundation of offshore wind power Cell Spar does not increase linearly with the increase of the number of swinging plates, and it is attenuated by the sheltering action of hard and soft tanks of Spar floating foundation, which provides theoretical support for the subsequent optimization of swinging plates. It provides a new idea and method for predicting the hoop performance of floating foundation of offshore wind power.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P751;TM315

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