【摘要】：近些年由于國(guó)際能源形勢(shì)緊張和環(huán)境問題日益突出，人們對(duì)新能源的需求越來越迫切。由于風(fēng)能無(wú)污染，是可再生的綠色能源，其得到了迅猛的發(fā)展。目前，各國(guó)都在積極開發(fā)利用風(fēng)能，我國(guó)也不例外。若要實(shí)現(xiàn)將風(fēng)能有效地轉(zhuǎn)換為電能這一目標(biāo)，必須依靠風(fēng)力發(fā)電機(jī)。 風(fēng)機(jī)葉片作為在整個(gè)風(fēng)力發(fā)電機(jī)組最關(guān)鍵和基礎(chǔ)的部件之一，受載情況非常復(fù)雜，其設(shè)計(jì)的規(guī)范性，工藝的合理性以及質(zhì)量的可靠性直接關(guān)系到整個(gè)系統(tǒng)的性能和穩(wěn)定運(yùn)行。本課題以某一水平軸風(fēng)力發(fā)電機(jī)的復(fù)合材料葉片為研究對(duì)象，從葉片設(shè)計(jì)建模、葉片RTM充填過程仿真、葉片力學(xué)分析這三個(gè)方面展開研究。 采用Wilson模型，選用合適的葉片翼型、尖速比等特征參數(shù)對(duì)葉片進(jìn)行設(shè)計(jì)，計(jì)算得到葉片不同半徑處截面的弦長(zhǎng)及扭角，通過坐標(biāo)變換求得葉片空間坐標(biāo)，通過Pro/E完成了葉片模型的建立，并得到葉片有限元模型。 基于Moldflow軟件平臺(tái)對(duì)葉片RTM成型過程進(jìn)行仿真，得到葉片充填時(shí)間、體積收縮率、殘余應(yīng)力、翹起變形等結(jié)果。為討論熔料溫度對(duì)成型制品的影響，對(duì)比了不同熔料溫度下的充填仿真結(jié)果，得到的結(jié)論對(duì)工藝過程的優(yōu)化以及葉片質(zhì)量的改善有指導(dǎo)意義。 基于有限元方法，采用ANSYS對(duì)葉片模型進(jìn)行力學(xué)分析，，計(jì)算得到葉片的固有頻率及振型，其頻率值與葉片理論頻率值很接近。并討論了導(dǎo)致葉片振動(dòng)的四個(gè)主要原因以及防止風(fēng)機(jī)葉片組發(fā)生共振的方法。在風(fēng)輪以額定轉(zhuǎn)速工作狀態(tài)下，對(duì)葉片進(jìn)行靜力分析，分析其應(yīng)力集中區(qū)域以及變形情況。 此外，本文為研究充填成型工藝對(duì)葉片性能的影響，將包含節(jié)點(diǎn)、各單元數(shù)據(jù)、材料屬性、殘余應(yīng)力等信息的Moldflow仿真結(jié)果導(dǎo)入到ANSYS中，對(duì)葉片進(jìn)行靜力分析，并與之前的靜力分析結(jié)果進(jìn)行對(duì)比。同時(shí)，考慮到工藝參數(shù)會(huì)對(duì)葉片性能產(chǎn)生影響，本文討論了不同熔料溫度下的葉片靜力分析結(jié)果，并總結(jié)出熔料溫度的變化對(duì)葉片性能產(chǎn)生的影響。
[Abstract]:In recent years, due to the shortage of international energy situation and the increasingly prominent environmental problems, people's demand for new energy is becoming more and more urgent. Because wind energy is pollution-free, it is a renewable green energy, and it has been developed rapidly. At present, countries are actively developing and utilizing wind energy, China is no exception. To achieve the goal of efficient conversion of wind energy to electricity, wind turbines must be relied on. As one of the most important and basic components in the whole wind turbine, the load condition of the fan blade is very complex. The standardization of the design, the rationality of the process and the reliability of the quality are directly related to the performance and stable operation of the whole system. In this paper, the composite blade of a horizontal axis wind turbine is studied from three aspects: blade design modeling, blade RTM filling process simulation, blade mechanics analysis. The Wilson model is used to design the blade with suitable characteristic parameters such as blade airfoil and pointed velocity ratio. The chord length and twist angle of cross section at different radius of blade are calculated, and the spatial coordinates of blade are obtained by coordinate transformation. The blade model is established by Pro/E, and the finite element model of blade is obtained. The RTM forming process of blade was simulated based on Moldflow software platform, and the results of filling time, volume shrinkage, residual stress and warping deformation were obtained. In order to discuss the effect of molten metal temperature on molded products, the simulation results of filling at different molten metal temperatures are compared. The conclusions obtained are of guiding significance to the optimization of the process and the improvement of blade quality. Based on the finite element method, the mechanical analysis of the blade model is carried out by using ANSYS. The natural frequency and mode shape of the blade are calculated, and the frequency value is very close to the theoretical frequency value of the blade. The four main causes of blade vibration and the method to prevent the resonance of fan blade group are discussed. Under the working condition of rated speed, the static analysis of the blade is carried out, and the stress concentration area and the deformation of the blade are analyzed. In addition, in order to study the influence of filling forming technology on blade performance, the Moldflow simulation results including node, element data, material attributes, residual stress and other information are imported into ANSYS, and the static analysis of the blade is carried out. The results of the static analysis are compared with the results of the previous static analysis. At the same time, considering the influence of technological parameters on blade performance, this paper discusses the static analysis results of blade under different molten metal temperature, and summarizes the influence of molten material temperature on blade performance.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM315;TB33

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