共查询到19条相似文献,搜索用时 696 毫秒
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为提升纯电动类清扫车车用动力离心风机的性能,针对某风机转子叶轮进行了叶片型线改进和多目标优化.采用圆弧型叶片替代原始风机叶片,并建立叶轮参数化模型以便优化.结合最优拉丁超立方采样方法、Kriging模型和改进的NSGA-Ⅱ算法,以全压效率和全压为目标对叶轮进行了多目标优化.优化前后的数值模拟结果表明:单独叶轮优化后全压... 相似文献
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现采用SolidWorks软件对某鼓风机叶轮建立三维模型,并利用SimulationXpress模块直接对叶轮零件进行有限元分析,求出在工作转速下叶轮的应力、变形情况,以及考虑刚化效应对叶轮模态振型的影响,求得叶轮的各阶固有频率和振型,并计算出各阶的临界转速.其分析结果有利于叶轮的结构优化设计与性能改进. 相似文献
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为最大限度地减小叶轮质量,通过反求模型和网格密度精度的分析,对叶轮结构进行数值计算,并构造了拉丁超立方试验设计模型和Kriging近似模型,得到叶轮结构的采样空间和高精度的近似模型用来代替数值分析,提出了轨道轴流风机叶轮结构多目标遗传优化方法。采用该方法分析了主要技术参数对叶轮结构受力的灵敏性,并找出了对叶轮结构应力影响最大的参数。叶轮结构通过优化后,质量减小了31.7%,大大节省了材料的成本,最大应力值也由初始方案的21.5MPa变为16.5MPa,有效地提高了叶轮的力学性能。优化后通过滑环引电器和动静态应变测试系统对风机叶轮进行动静态试验,并设计了叶轮旋转机械的工艺工装和试验方案,试验结果与计算结果十分吻合,且动应力相对很小,因此,叶轮具有良好的力学和振动性能,在工程应用中具有较高的价值。 相似文献
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This work developed improved slip factor model and correction method to predict flow through impeller in forward-curved centrifugal
fan. Both steady and unsteady three-dimensional CFD analyses were performed to validate the slip factor model and the correction
method. The results show that the improved slip factor model presented in this paper could provide more accurate predictions
for forward-curved centrifugal impeller than the other slip factor models since the present model takes into account the effect
of blade curvature. The correction method is provided to predict mass-averaged absolute circumferential velocity at the exit
of impeller by taking account of blockage effects induced by the large-scale backflow near the front plate and flow separation
within blade passage. The comparison with CFD results also shows that the improved slip factor model coupled with the present
correction method provides accurate predictions for mass-averaged absolute circumferential velocity at the exit of impeller
near and above the flow rate of peak total pressure coefficient. 相似文献
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车用涡轮增压器的压气机叶轮常常因为振动而导致破坏,对压气机叶轮进行模态分析是避免叶轮与激振频率发生共振的常用手段,能有效避免因发生共振而导致的叶轮破坏问题。利用AN-SYS软件,采用子结构分析方法对压气机叶轮的中低阶固有频率进行了数值仿真计算,获得了不同转速和不同节径时的频率,并根据计算结果绘制了Campbell图,找出了与压气机叶轮固有频率产生共振的转速,为压气机叶轮的优化设计提供了依据,同时说明采用子结构分析的方法可以较精确地获得整体模型的低阶固有频率解。 相似文献
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Sung Kim Kyoung-Yong Lee Joon-Hyung Kim Jin-Hyuk Kim Uk-Hee Jung Young-Seok Choi 《Journal of Mechanical Science and Technology》2015,29(1):227-240
In this paper, we describe a numerical study about the performance improvement of a mixed-flow pump by optimizing the design of the impeller and diffuser using a commercial computational fluid dynamics (CFD) code and design-of-experiments (DOE). The design variables of impeller and diffuser in the vane plane development were defined with a fixed meridional plane. The design variables were defined by the vane plane development, which indicates the blade-angle distributions and length of the impeller and diffuser. The vane plane development was controlled using the blade-angle in a fixed meridional plane. The blade shape of the impeller and diffuser were designed using a traditional method in which the inlet and exit angles are connected smoothly. First, the impeller optimum design was performed with impeller design variables. The diffuser optimum design was performed with diffuser design variables while the optimally designed impeller shape was fixed. The importance of the impeller and diffuser design variables was analyzed using 2k factorial designs, and the design optimization of the impeller and diffuser design variables was determined using the response surface method (RSM). The objective functions were defined as the total head (Ht) and the total efficiency (?t) at the design flow rate. The optimally designed model was verified using numerical analysis, and the numerical analysis results for both the optimum model and the reference model were compared to determine the reasons for the improved pump performance. A pump performance test was carried out for the optimum model, and its reliability was proved by a comparative analysis of the results of the numerical analysis and an experiment using the optimum model. 相似文献
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以百万吨装置用压缩机T 4叶轮作为研究对象,基于有限元软件建立了叶轮的参数化有限元三维模型。选择几个关键几何尺寸作为随机变量,结合人工神经网络技术、随机摄动技术、矩阵微分理论和可靠性理论,以叶轮所受的最大应力不超过材料屈服强度为准则,建立了裂解气压缩机T 4叶轮的可靠性分析模型,并进行了可靠性灵敏度分析。在对各个参数进行无量纲化后,得到各参数对可靠度的灵敏度排序,为工程实际中叶轮的设计提供了理论依据。 相似文献
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叶轮、叶片类复杂零件造型方法的研究 总被引:11,自引:0,他引:11
叶轮、 叶片类零件是汽车、航空等领域广泛使用的重要部件之一,它的造型方法一直是人们研究的焦点,这里采用NURBS(非均匀有理B样条)方法建立了叶轮、叶片类零件的造型模型,为叶轮、叶片类零件的数控加工了基础,提高了叶轮、叶片类零件的造型及加工效率。 相似文献