本文關(guān)鍵詞：垂直軸風(fēng)力機(jī)的結(jié)構(gòu)分析及設(shè)計(jì)優(yōu)化　出處：《華北電力大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 葉片 穩(wěn)定性分析 結(jié)構(gòu)設(shè)計(jì) 模念分析 氣動(dòng)特性

【摘要】：全球化石能源燃料的過度消耗以及人類生存環(huán)境的逐日惡化,使得新型無污染能源成為世界各國高度關(guān)注的焦點(diǎn)。風(fēng)能,作為新型無污染能源的典型代表,在開發(fā)和利用方面顯得尤為迅猛。我國作為典型的發(fā)展中大國,風(fēng)力發(fā)電在我國的狀況更是如此,最近幾年,我國在政策法規(guī)及經(jīng)濟(jì)技術(shù)上大力推動(dòng)新型能源的開發(fā)利用,但是,作為一個(gè)后續(xù)利用新型能源的發(fā)展中大國,我國的風(fēng)力發(fā)電技術(shù)還是遠(yuǎn)遠(yuǎn)地落后于其它發(fā)達(dá)國家的,其中,主要的表現(xiàn)就是風(fēng)機(jī)葉片的研究。本文通過理論分析與有限元數(shù)值模擬相結(jié)合的方法,對一個(gè)應(yīng)用于項(xiàng)目實(shí)驗(yàn)中的垂直軸風(fēng)力機(jī)進(jìn)行相關(guān)研究,使仿真計(jì)算結(jié)果更加逼近實(shí)際工況,達(dá)到更加準(zhǔn)確的計(jì)算結(jié)果,主要的工作和成果有：1)介紹了世界各國在垂直軸風(fēng)力機(jī)方面的研究背景及研究成果,通過對其設(shè)計(jì)理論、流管模型以及空氣動(dòng)力學(xué)在其中的運(yùn)用的詳細(xì)講述,明確了其運(yùn)行狀態(tài)及動(dòng)力來源,并運(yùn)用轉(zhuǎn)矩公式推導(dǎo)了其轉(zhuǎn)動(dòng)力矩的計(jì)算公式。2)通過運(yùn)用流場分析軟件FLUENT,對所研究葉片的建模分析,計(jì)算得到了此種葉片翼型的氣動(dòng)性能參數(shù)以及葉片表面的風(fēng)壓、風(fēng)速云圖等。研究表明：此種風(fēng)力機(jī)葉片的升阻比較高,空氣動(dòng)力學(xué)性能較好。3)通過對此種翼型的五葉片MRF模型的建立,計(jì)算得到了風(fēng)機(jī)周圍區(qū)域的流場情況,在以后的實(shí)際風(fēng)場的壓力場變化研究上,奠定了更加扎實(shí)的基礎(chǔ)。4)詳細(xì)闡述了在流場計(jì)算軟件FLUENT中模擬計(jì)算風(fēng)機(jī)葉片表面對應(yīng)節(jié)點(diǎn)處的風(fēng)壓,以及以EXCEL表格的形式進(jìn)行輸出,然后再運(yùn)用MATLB軟件進(jìn)行數(shù)據(jù)擬合,最后倒入有限元軟件ANSYS中的具體操作過程及處理方式。在風(fēng)載作用的計(jì)算上此種方式的計(jì)算更為精確。通過最佳攻角狀態(tài)下葉片結(jié)構(gòu)表面的力學(xué)結(jié)構(gòu)分析可知：承受風(fēng)載壓力最大的位置是翼型葉片同風(fēng)機(jī)支撐的連接部位,葉尖處較小,基本呈對稱分布。在做葉片結(jié)構(gòu)設(shè)計(jì)時(shí)可以參考上述結(jié)論,對受力較大的葉片連接點(diǎn)處重點(diǎn)加強(qiáng),對受力較小的位置適當(dāng)減少材料。同時(shí)本文還進(jìn)行了葉片的模態(tài)分析,得到了前6階的模態(tài)振型圖及相關(guān)數(shù)據(jù),分析得出：該葉片不存在產(chǎn)生共振的可能性,符合設(shè)計(jì)要求。5)通過ANSYS軟件的應(yīng)用,對塔架的穩(wěn)定性及振動(dòng)特性進(jìn)行分析。穩(wěn)定性的分析,得到了塔架的屈曲臨界彎矩,并確定了塔架具有很小的失穩(wěn)傾向性；模態(tài)的分析,確定了塔架、葉片的各階固有頻率,機(jī)組不會出現(xiàn)共振現(xiàn)象。上述所做的工作,旨在能夠更好地實(shí)現(xiàn)對風(fēng)機(jī)機(jī)組結(jié)構(gòu)的力學(xué)性能分析,更加確切地,真實(shí)地還原風(fēng)力機(jī)機(jī)組在運(yùn)行中所面臨的工作力學(xué)問題,從而得到更精確的結(jié)構(gòu)設(shè)計(jì),避免不必要的資源損失,同時(shí)也希望能夠?yàn)榇怪陛S風(fēng)力機(jī)機(jī)組結(jié)構(gòu)力學(xué)性能分析起到一定的經(jīng)驗(yàn)價(jià)值和借鑒作用。
[Abstract]:The fossil energy fuel excessive consumption and human living environment is deteriorating day by day, the new pollution-free energy has become the focus of attention of all countries in the world. Wind energy, as a typical kind of non polluting energy, in the development and use of it is particularly rapid. China is a typical developing country, wind power generation in China the situation is so, in recent years, China's policies and regulations in the economic and technology vigorously promote the development and utilization of new energy. However, as a big developing country with a subsequent use of new energy, China's wind power technology is still far behind other developed countries, the main performance is the wind turbine blade research. Through theoretical analysis and finite element numerical simulation method combining the related research of vertical axis wind turbine on a project used in experiments, the simulation Results more close to actual conditions, to achieve more accurate results, the main work and results are as follows: 1) introduces the research background and research achievements in the vertical axis wind turbine the world, based on the design theory, detailed flow using tube model and aerodynamic in the clear, the the running state and the power source, and the use of torque is deduced the torque calculation formula of.2) by using flow analysis software FLUENT, analysis of the modeling on leaves, calculated the blade aerodynamic performance parameters and wind pressure on the surface of leaves, the wind speed contour. The study shows that the lift drag wind turbine the blade is relatively high, the aerodynamic performance of.3 is better) by establishing the MRF model of this kind of five blade airfoil, obtained the flow field around the area of the fan after the actual calculation. The changes of the pressure field of wind field on the foundation of.4 more solid) describes the simulation calculation of air pressure of fan blade surface corresponding to the nodes in the FLUENT software in the field, as well as EXCEL form in the form of output, and then use the MATLB software for data fitting, and finally into the finite element software ANSYS the specific operation process and treatment. In the calculation of wind load calculation in this way is more accurate. The mechanical structure of the surface structure of leaves under the condition of optimum angle of attack. The analysis shows: the position of the maximum pressure under wind load is connected with the airfoil fan support, at the tip of small, basically symmetrical distribution. Refer to the above conclusion in blade structure design, strengthen the blade large stress at the connection point of focus, smaller stress position appropriate to reduce the material. At the same time this paper The modal analysis of blade, the first 6 order modal graph and the related data analysis shows that the blade does not exist the possibility of resonance, meet the design requirements of.5) by the application of ANSYS software, analyzed the stability and vibration characteristics of the tower. The stability analysis, the critical moment of the tower. And the tower has a stable tendency of very small loss; modal analysis, to determine the tower, the natural frequency of the blade, the unit will not appear resonance. The work mentioned above, in order to better achieve the mechanical properties of the wind machine group structure analysis, more precisely, restore the true work the mechanical problems facing the wind turbine unit in operation, so as to obtain more accurate structural design, to avoid unnecessary loss of resources, also hope to be able to analyze performance of vertical axis wind turbine generator mechanical structure up To a certain value of experience and reference.

【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM315

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本文編號：1414296