發(fā)布時間：2018-02-23 21:35

  本文關(guān)鍵詞： 水輪機 轉(zhuǎn)輪 Pro/E 準(zhǔn)確建模 Fluent　出處：《河北工程大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：水電資源是可再生資源，在我國能源可持續(xù)發(fā)展中占有重要地位。水電資源具有運費低、可再生、無污染等優(yōu)點，有利于電力調(diào)控、提高資源利用率以及社會經(jīng)濟的綜合效益。水輪機是實現(xiàn)能量轉(zhuǎn)化的重要機械。轉(zhuǎn)輪是水輪機的重要組成部分。葉片是轉(zhuǎn)輪的重要組成零件，由復(fù)雜扭曲曲面體構(gòu)成。葉片的結(jié)構(gòu)對水輪機空化、空蝕與效率有重要影響。因此轉(zhuǎn)輪的設(shè)計及準(zhǔn)確建模具有重要的研究意義。 本文以貫流式水輪機為例對轉(zhuǎn)輪進行設(shè)計與準(zhǔn)確建模。通過轉(zhuǎn)輪進出口速度三角形進行分析計算，，得到了葉片葉型型值點；利用Matlab編制葉型程序，以數(shù)據(jù)來文件的方法導(dǎo)入Pro/E；采用等距延伸切割法，解決了Pro/E生成的葉片曲面向上翻翹的問題，實現(xiàn)了水輪機轉(zhuǎn)輪的準(zhǔn)確建模。在此基礎(chǔ)上，使用Fluent對轉(zhuǎn)輪模型進行了流場分析。通過后處理結(jié)果分析，發(fā)現(xiàn)葉片最值負壓出現(xiàn)在葉片背面出口邊靠近輪緣處，即極易出現(xiàn)空化、空蝕的位置，發(fā)現(xiàn)轉(zhuǎn)輪葉片的制動區(qū)域出現(xiàn)在58°至71°之間。并對轉(zhuǎn)輪的效率進行了計算。經(jīng)過數(shù)值模擬，驗證了轉(zhuǎn)輪在較高的效率下運行，證明前期建模方法的可行性以及建模結(jié)果的準(zhǔn)確性。 本文通過對轉(zhuǎn)輪建模方法的研究發(fā)現(xiàn)，對于復(fù)雜類零件的準(zhǔn)確建模宜采用分割造型，即先將幾何體用若干個曲面進行拼接，然后進行合并、實體化，再按照延伸規(guī)律切割修型并進行光滑性檢查。實踐證明，該方法在完成轉(zhuǎn)輪這類復(fù)雜零件的準(zhǔn)確建模時是行之有效的。
[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 擄and 71 擄. 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.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TK730.3

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