超速预加载对叶轮疲劳性能的影响

发布时间：2018-07-29 14:42

【摘要】：超速预加载是叶轮制造过程中的重要环节,它不仅仅是检验叶轮质量的手段,更是一种巧妙的工艺过程。通过建立叶轮的有限元模型并对超速预加载工艺过程进行模拟分析,以阐释其中的力学原理。首先对半开式叶轮进行弹塑性分析,结果表明,叶轮在经过超速预加载处理后会在高应力区产生残余应力,使得其在正常工况下的最大应力有所降低;随后利用FE-SAFE分别对半开式叶轮在启停和转速小幅波动两种工况下的疲劳寿命进行分析,通过对比有无超速预加载处理的结果得知,超速预加载处理会在很大程度上提升叶轮的疲劳寿命,甚至可以避免疲劳破坏的发生;最后,对多种荷载作用下的闭式叶轮进行了疲劳分析,结果显示超速预加载处理之后的闭式叶轮可以抵抗更大的交变气动载荷而不会出现疲劳破坏。
[Abstract]:Over-speed preloading is an important part of impeller manufacturing. It is not only a means to test the quality of impeller, but also an ingenious process. The finite element model of impeller was established and the process of overspeed preloading was simulated and analyzed to explain the mechanics principle. Firstly, the elastic-plastic analysis of semi-open impeller is carried out. The results show that the impeller will produce residual stress in high stress region after overspeed preloading, which makes the maximum stress of impeller decrease under normal working condition. Then the fatigue life of semi-open impeller under two working conditions, starting and stopping and speed fluctuating slightly, was analyzed by FE-SAFE, and the results of overspeed preloading were compared. The fatigue life of impeller can be greatly improved by overspeed preloading, and even fatigue failure can be avoided. Finally, fatigue analysis of closed impeller under various loads is carried out. The results show that the closed impeller after overspeed preloading can resist larger alternating aerodynamic load without fatigue failure.
【作者单位】：大连理工大学工业装备结构分析国家重点实验室;大连理工大学工程力学系;沈阳鼓风机集团有限公司;
【基金】：国家自然科学基金项目(11272074) 973项目(613277)资助~~
【分类号】：TH452

【相似文献】