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根据离心风机的实际工作情况,采用理论计算与ANSYS软件相结合的方法,对离心风机叶轮进行三维建模、风道流场分析和强度分析,从而得出不同转速下叶轮的强度,然后对不同转速下的强度与位移变形进行对比分析,确定叶轮能承受的最大转速,为更好地掌握和分析离心风机生产运行工况提供理论基础。 相似文献
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压气叶轮作为压缩机的主要部件,主要受离心力影响。通过仿真计算在不改变气动参数的前提下,带有8个叶片的闭式离心叶轮,在离心荷载作用下,分析了叶顶倒角、轮盖厚度、轮盖倒角对叶轮的强度影响。经过分析,发现在叶片进口叶顶位置应力最大。为了减小叶轮局部位置上最大应力,对叶片与轮盖的连接处倒圆进行了分析。进一步对轮盖的几何结构重新优化设计,分析结果证明盘侧厚度增加有利于提高叶轮强度;通过改进整体叶轮外形,叶片进口处的应力集中现象得到大幅度的改善。 相似文献
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针对钢制、玻璃纤维、碳纤维等不同材料和铺层的离心风机叶轮,使用有限元方法对离心叶轮进行强度和固有频率计算分析,钢制叶轮采用Von-Mises等效应力作为失效判定,复合材料叶轮失效判定采用Tasi-Wu失效准则,并计算安全裕度。结果表明,叶轮材料对强度和固有频率存在较大影响,碳纤维离心叶轮相对于钢制和玻璃纤维离心叶轮在强度方面具有明显优势,且有足够的安全裕度,对离心叶轮的轻量化和提高风机性能具重要意义;铺层角度对复合材料叶轮强度影响较大,而对固有频率影响较小,最优方案为采用[60°/0°/-60°]铺层角度。 相似文献
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以实验分析为基础,综合各种因素对离心压缩机叶轮强度的影响,提出了离心鼓风机、压缩机设计中叶轮材料强度的确定原则和叶轮设计注意事项。 相似文献
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运用大型通用有限元分析软件ANSYS8.0,对离心叶轮内流场三维紊流进行了分析.获得了叶轮内流场压力分布,确定了叶轮结构分析中液体作用于叶片上的载荷.在此基础上对叶轮结构进行了有限元分析,准确直观地得到了叶轮各处的应力和应变值,为叶轮的强度计算和设计提供了可靠依据. 相似文献
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Kawin Sonthipermpoon E. Bohez H. Hasemann M. Rautenberg 《The International Journal of Advanced Manufacturing Technology》2010,46(9-12):1171-1177
Today, in most cases, impellers of centrifugal compressors are produced by flank milling on five-axis CNC milling machines. The complex three-dimensional geometry of the very thin blades consists of ruled surfaces. The flank milling process allows a fast production of the impellers and the surface of the blades is of high quality. The limited strength of the very thin blades and also the thin outer radial part of the disk lead to a high sensitivity to static and especially dynamic forces that are caused by the instationary flow in the impeller. The dynamic forces of rotating stall and surge are the most dangerous excitations of the bladed disk. Coupled vibrations may occur and damage the impeller. The highest static load is caused by the centrifugal forces. Therefore, most of the high-loaded impellers are manufactured from aluminum alloy or titanium because of the low density of this light metals and the relatively high strength. Most of the interests and the investigations in the last years are paid to the vibration behavior and the dynamic loads of the impeller during operation. But sometimes, the highest stress may occur during the production process and damage the impeller or weaken the strength and so cause later problems. Especially, excitations from the dynamic forces during the flank milling process have to be taken under consideration. The vibration behavior of the impeller is very complex and is affected by the vibration behavior of the cutter and the milling machine. In this paper, the change of the vibration behavior of centrifugal compressor impeller blades during the manufacturing process is investigated. During the finishing of the thin blades, the blade thickness is continuously changing and also the strength and the corresponding eigenfrequencies of the blade. The dynamic forces acting on the blades are caused by the cutter, the milling machine, and the cutting process. The quantity of the forces and the frequency of the excitation are determined by the rotational speed of the cutter, the feed, the number of edges, and the chip thickness. The results described in this paper give useful information about the change of the vibration behavior of the centrifugal impeller blades during the flank milling process and possible interaction with the cutter and the machine. 相似文献
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基于Workbench整体叶轮流固耦合强度分析 总被引:1,自引:0,他引:1
作为许多动力机械的核心部件的叶轮,其强度及可靠性的问题日渐突出。叶轮工作时,流体力和高速旋转时的离心力为其主要载荷。基于Workbench软件对整体叶轮的内部流场和工作压力分布进行数值模拟;使用ANSYS CFX进行复杂几何形状叶轮的流体动力分析,得到了整体叶轮的流场和工作压力场及流体载荷在叶轮内部产生的等效应力分布图,并耦合了旋转离心载荷等,研究了在高压工况情况下,叶轮的载荷组成和流固耦合下的叶轮强度。 相似文献
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本文基于N-S方程和标准k-ε紊流模型,对LB50-160型离心泵设计流量下叶轮内流场三维紊流进行了数值计算,获得了叶轮内流场的速度、压力分布,捕捉到了一些重要的流动现象。并对数值计算结果进行了深入的分析研究,为叶轮的水力设计提供了有价值的信息。对叶轮结构进行了有限元分析,准确且直观的得到了叶轮在载荷作用下的应力和应变,为叶轮的强度计算提供了可靠依据。 相似文献
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离心鼓风机开式叶轮的强度分析与改造 总被引:2,自引:1,他引:1
采用有限元分析软件,对一开式离心鼓风机叶轮进行强度分析.通过计算结果分析与实际叶轮比较,发现叶片疲劳断裂主要是由于靠近轮毂处叶片较大转折所致.在此基础上,对叶片进行改造,通过计算分析以及实际运行验证,问题得到解决,效果良好. 相似文献