水轮机转轮CAD及其准确建模方法的研究

发布时间：2018-02-23 21:35

本文关键词： 水轮机转轮 Pro/E 准确建模 Fluent　出处：《河北工程大学》2014年硕士论文　论文类型：学位论文

【摘要】：水电资源是可再生资源，在我国能源可持续发展中占有重要地位。水电资源具有运费低、可再生、无污染等优点，有利于电力调控、提高资源利用率以及社会经济的综合效益。水轮机是实现能量转化的重要机械。转轮是水轮机的重要组成部分。叶片是转轮的重要组成零件，由复杂扭曲曲面体构成。叶片的结构对水轮机空化、空蚀与效率有重要影响。因此转轮的设计及准确建模具有重要的研究意义。本文以贯流式水轮机为例对转轮进行设计与准确建模。通过转轮进出口速度三角形进行分析计算，，得到了叶片叶型型值点；利用Matlab编制叶型程序，以数据来文件的方法导入Pro/E；采用等距延伸切割法，解决了Pro/E生成的叶片曲面向上翻翘的问题，实现了水轮机转轮的准确建模。在此基础上，使用Fluent对转轮模型进行了流场分析。通过后处理结果分析，发现叶片最值负压出现在叶片背面出口边靠近轮缘处，即极易出现空化、空蚀的位置，发现转轮叶片的制动区域出现在58°至71°之间。并对转轮的效率进行了计算。经过数值模拟，验证了转轮在较高的效率下运行，证明前期建模方法的可行性以及建模结果的准确性。本文通过对转轮建模方法的研究发现，对于复杂类零件的准确建模宜采用分割造型，即先将几何体用若干个曲面进行拼接，然后进行合并、实体化，再按照延伸规律切割修型并进行光滑性检查。实践证明，该方法在完成转轮这类复杂零件的准确建模时是行之有效的。
[Abstract]:Hydropower resources are renewable resources and play an important role in the sustainable development of energy resources in China. Hydropower resources have the advantages of low freight, renewable and pollution-free, which is conducive to power regulation and control. The turbine is an important machinery for energy conversion. The runner is an important part of the turbine, and the blade is an important component of the runner. The blade structure has an important effect on the cavitation cavitation cavitation and efficiency of the turbine. Therefore the design and accurate modeling of the runner is of great significance. This paper takes the tubular turbine as an example to design and model the runner accurately. Through the analysis and calculation of the speed triangle of the runner inlet and outlet, the value points of the blade shape are obtained, and the blade shape program is compiled by using Matlab. The method of data file is used to import Pror / E, and the isometric extension cutting method is used to solve the problem of turning up the blade surface generated by Pro/E, and to realize the accurate modeling of hydraulic turbine runner. The flow field of the runner model is analyzed by Fluent. Through the analysis of the post-processing results, it is found that the most valuable negative pressure of the blade appears near the flange on the back side of the blade, that is, the position of cavitation and cavitation is easy to occur. It is found that the braking region of the runner blade is between 58 掳and 71 掳. The efficiency of the runner is calculated. The feasibility of the previous modeling method and the accuracy of the modeling results are proved. In this paper, through the research of the modeling method of the runner, it is found that the accurate modeling of the complex parts should be divided into pieces, that is to say, the geometry is first spliced with several curved surfaces, then merged and materialized. The method is proved to be effective in the accurate modeling of complex parts such as runner.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TK730.3

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