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复合材料风机叶片RTM充填过程仿真及力学分析

发布时间:2019-04-15 13:22
【摘要】:近些年由于国际能源形势紧张和环境问题日益突出,人们对新能源的需求越来越迫切。由于风能无污染,是可再生的绿色能源,其得到了迅猛的发展。目前,各国都在积极开发利用风能,我国也不例外。若要实现将风能有效地转换为电能这一目标,必须依靠风力发电机。 风机叶片作为在整个风力发电机组最关键和基础的部件之一,受载情况非常复杂,其设计的规范性,工艺的合理性以及质量的可靠性直接关系到整个系统的性能和稳定运行。本课题以某一水平轴风力发电机的复合材料叶片为研究对象,从叶片设计建模、叶片RTM充填过程仿真、叶片力学分析这三个方面展开研究。 采用Wilson模型,选用合适的叶片翼型、尖速比等特征参数对叶片进行设计,计算得到叶片不同半径处截面的弦长及扭角,通过坐标变换求得叶片空间坐标,通过Pro/E完成了叶片模型的建立,并得到叶片有限元模型。 基于Moldflow软件平台对叶片RTM成型过程进行仿真,得到叶片充填时间、体积收缩率、残余应力、翘起变形等结果。为讨论熔料温度对成型制品的影响,对比了不同熔料温度下的充填仿真结果,得到的结论对工艺过程的优化以及叶片质量的改善有指导意义。 基于有限元方法,采用ANSYS对叶片模型进行力学分析,,计算得到叶片的固有频率及振型,其频率值与叶片理论频率值很接近。并讨论了导致叶片振动的四个主要原因以及防止风机叶片组发生共振的方法。在风轮以额定转速工作状态下,对叶片进行静力分析,分析其应力集中区域以及变形情况。 此外,本文为研究充填成型工艺对叶片性能的影响,将包含节点、各单元数据、材料属性、残余应力等信息的Moldflow仿真结果导入到ANSYS中,对叶片进行静力分析,并与之前的静力分析结果进行对比。同时,考虑到工艺参数会对叶片性能产生影响,本文讨论了不同熔料温度下的叶片静力分析结果,并总结出熔料温度的变化对叶片性能产生的影响。
[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.
【学位授予单位】:郑州大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TM315;TB33

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