本文選題：仿真數(shù)值計算　切入點：混流式水輪機　出處：《昆明理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：水力發(fā)電中,水輪機占據(jù)著水電站的樞紐位置,隨著國家積極發(fā)展大型水電建設(shè),混流式水輪機成為了應(yīng)用最廣泛的一種水輪機。以某水電站混流式水輪機為本文的仿真研究對象,通過對水輪機流場進行三維建模的方法,以計算機為實驗平臺,采用全流道仿真模擬計算方法對水輪機內(nèi)部流動狀況進行研究。首先介紹本文的研究背景與意義,水輪機內(nèi)部流動的研究方法,且簡要概述國內(nèi)外混流式水輪機全流道仿真研究的研究現(xiàn)狀;其次展開對CFD軟件的介紹和計算中所用到的基本理論知識,著重討論幾種湍流的分析計算方法的優(yōu)劣性;然后結(jié)合專業(yè)建模軟件運用專業(yè)CAD軟件Pro/Engineer對水輪機全流道的各個過流部件進行三維實體建模,運用專業(yè)網(wǎng)格劃分軟件ICEM對全流道網(wǎng)格進行劃分,實現(xiàn)CAD/CFD技術(shù)的融合,蝸殼、導葉、轉(zhuǎn)輪等均采用非結(jié)構(gòu)體網(wǎng)格劃分,尾水管流場部分采用結(jié)構(gòu)體網(wǎng)格劃分。最后采用選擇Realizablek-ε模型作為本次仿真計算模型,針對水輪機的8個不同工況進行仿真數(shù)值計算,分析各個過流部件的計算結(jié)果,包括蝸殼、活動導葉、轉(zhuǎn)輪、尾水管的速度場與壓力場分布,并在此基礎(chǔ)上進行非穩(wěn)態(tài)模擬計算,最后得到了尾水管的壓力脈動時域分布,分析其壓力脈動特性,并推斷產(chǎn)生壓力脈動原因,找出機組穩(wěn)定運行區(qū)間,為實際工程中的機組穩(wěn)定性運行提供理論基礎(chǔ),并且為找出不同工況下運行與尾水管壓力脈動強度的關(guān)系做了初步的探索。
[Abstract]:In hydroelectric power generation, hydraulic turbines occupy the pivotal position of hydropower stations. With the active development of large-scale hydropower construction in the country, Francis turbine has become the most widely used hydraulic turbine. Taking the Francis turbine of a hydropower station as the object of this paper, through the method of three-dimensional modeling of the turbine flow field, the computer is used as the experimental platform. This paper introduces the research background and significance of this paper, and introduces the research method of the internal flow of the turbine. The research status of Francis turbine full-channel simulation at home and abroad is briefly summarized. Secondly, the basic theoretical knowledge used in the introduction and calculation of CFD software is introduced, and the advantages and disadvantages of several turbulence analysis and calculation methods are emphatically discussed. Then combining with the professional modeling software, using the professional CAD software Pro/Engineer to carry on the three-dimensional entity modeling to each flow passage parts of the hydraulic turbine, and using the professional grid division software ICEM to divide the whole flow channel grid, realize the integration of CAD/CFD technology, volute. The guide vane, runner and so on are divided by non-structural mesh, and the flow field of draft tube is divided by structural grid. Finally, the realizablek- 蔚 model is selected as the simulation model, and the simulation numerical calculation is carried out for 8 different working conditions of the turbine. The distribution of velocity field and pressure field of volute, active guide vane, runner and draft tube are analyzed. Based on this, unsteady state simulation calculation is carried out, and the time domain distribution of pressure pulsation of draft tube is obtained. The characteristics of pressure pulsation are analyzed, and the causes of pressure pulsation are inferred, and the stable operation interval of the unit is found out, which provides a theoretical basis for the stable operation of the unit in practical engineering. In order to find out the relationship between operation and pressure pulsation intensity of draft tube under different working conditions, a preliminary exploration has been made.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV734.1

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