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题名	液态金属磁流体波浪能发电机系统的研究; 液态金属磁流体波浪能发电机系统的研究
作者	1林佐伟,电工研究所
学位类别	硕士
答辩日期	2008-06-05
授予单位	中国科学院电工研究所
导师	1彭爱武,电工研究所
关键词	波浪能 液态金属磁流体发电 性能分析 数值模拟 端部效应 Wave energy LMMHD-WEG Performance analysis Numerical simulation End effect
其他题名	液态金属磁流体波浪能发电机系统的研究
中文摘要	随着社会经济的发展，人们对能源的需求越来越大；但日益减少的煤、石油等传统矿产资源一方面改善了人们的生活方式，另一方面也改变了人们的生活环境。面临日益枯竭的自然资源和由其导致的日益严峻的自然生态环境，迫使人们将目光投向可再生能源，对这些新能源的研究、开发和利用已势在必行。海洋波浪能是一种取之不尽用之不竭的绿色可再生能源，且蕴藏量巨大；我国是一个海洋大国，可利用的海洋波浪能也极为丰富。 液态金属磁流体(LMMHD)波浪能直接发电系统是采用高效的液态金属磁流体发电技术，将波浪的起伏运动转换成液态金属的往复运动，利用LMMHD的原理，通过功率转换系统，将波浪能直接转换成用户需要的电能。该系统充分利用了LMMHD发电机的特点，使发电机很好地与波浪运动速度缓慢、作用力巨大的运动特性相匹配，形成了一种转换效率高、功率密度大、结构紧凑、成本低廉、移动性好并易于商业化推广的波浪能发电新技术。在目前全球化石能源日益紧缺，环境污染日趋严重的形势下，该项研究具有重要的现实意义。 本文阐述了液态金属磁流体波浪能发电机(LMMHD-WEG)系统的基本运行过程。建立了发电机的物理结构模型和运动学模型。并对系统整体性能进行了仿真分析，重点分析了发电机系统对外部条件的适应性和系统结构参数对系统性能的影响，得到了进行系统设计的一些原则要求。论文同时对LMMHD发电机的内部特性进行了三维数值模拟，分析了LMMHD发电通道中的磁流体动力学特性，着重研究了发电通道中端部效应的产生机理，并提出了降低端部损失的综合性方案，为以后设计LMMHD发电机提供了依据。 With the development of human society, the increasing energy requirements make the energy crisis getting more and more serious. It is imperative to do researches on developing and harnessing new energy resources. As we known，the ocean wave energy is a kind of clean and renewable energy resource with huge reserves in the world. And in China, which is a maritime country, the ocean wave energy is also extremely rich. The current wave generator systems almost use traditional machine to convert wave energy to power energy which is indirect. So there is a machine impedance problem for the ocean waves provides a slow moving, high magnitude force whereas most electrical generating machinery operates at high speed and low torque. A new way to generate electric power from ocean wave motion is proposed in this paper. The system makes use of liquid metal magnetohydrodynamics (LMMHD), and provides an excellent match to the mechanical impedance of an ocean wave. In the LMMHD wave energy generator (LMMHD-WEG), a high-conductivity liquid metal reciprocating motion adapt to the up-and-down movement of ocean wave without machine impedance problem. The proposal of this new wave generator has been a new approach utilizing wave energy. This paper describes the background of wave generator and the new LMMHD-WEG, also expatiates the basic principle and running process of the generator. A physical structure model and a mathematic kinematics model have been built to be used in the simulation study of system performance with MATLAB software. The influence to the system performance of external circumstance and structure parameters has been researched and has got some guild line for actual system designing. A powerful tool of MHD module in FLUENT has been used to analysis the MHD characteristic in the MHD channel which is the key part of the generator. And end effect is widespread in the MHD power generator．End effect causes much energy loss duo to the external magnetic field in the end region of the effective MHD channel. An analysis in theory has been given first, and then a full solution to reduce the end effect has been proposed. After that, some numerical simulations have been carried out to validate the solution. The results show that the influence of end effect has been weakened greatly with no return-path current and little eddy current when using an isolate plate and trapezoidal magnetic field with a trapezoidal geometry of flow channel. It is effective to lessen the end loss using this holistic solution. The solution provides a basis for the actual design of the MHD channel of wave energy generator.
语种	中文
公开日期	2010-10-18
页码	85
分类号	TM1
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/7103]
专题	电工研究所_其他部门_其他部门_硕士学位论文
推荐引用方式 GB/T 7714	1林佐伟,电工研究所. 液态金属磁流体波浪能发电机系统的研究, 液态金属磁流体波浪能发电机系统的研究[D]. 中国科学院电工研究所. 2008.

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