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Research on Blade-Casing Rub-Impact Mechanism by Experiment and Simulation in Aeroengines

机译：通过航空发动机的实验与仿真研究叶片机匣碰摩机理

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摘要

Aeroengines pursue high performance, and compressing blade-casing clearance has become one of the main ways to improve turbomachinery efficiency. Rub-impact faults occur frequently with clearance decreasing. A high-speed rotor-support-casing test rig was set up, and the mechanism tests of light and heavy rub-impact were carried out. A finite element model of the test rig was established, and the calculation results were in good agreement with the experimental results under both kinds of rub-impact conditions. Based on the actual blade-casing structure model, the effects of the major physical parameters including imbalance and material characteristics were investigated. During the rub-impact, the highest stress occurs at the blade tip first and then it is transmitted to the blade root. Deformation on the impact blade tip generates easily with decreased yield strength, and stress concentration at the blade tip occurs obviously with weaker stiffness. The agreement of the computation results with the experimental data indicates the method could be used to estimate rub-impact characteristics and is effective in design and analyses process.
机译：航空发动机追求高性能，压缩叶片壳体间隙已成为提高涡轮机械效率的主要方法之一。随着间隙的减小，经常会发生摩擦冲击故障。建立了高速转子支架试验台，并进行了轻，重摩擦的机理试验。建立了试验台的有限元模型，计算结果与两种碰摩条件下的实验结果吻合良好。根据实际的叶片-壳体结构模型，研究了主要物理参数对不平衡和材料特性的影响。在摩擦冲击过程中，最高应力首先在叶片尖端发生，然后再传递到叶片根部。随着屈服强度的降低，冲击叶片尖端上容易产生变形，而叶片尖端上的应力集中则明显发生，而刚性较弱。计算结果与实验数据吻合，表明该方法可用于估计碰摩特性，在设计分析过程中是有效的。

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  • 来源
    《Shock and vibration》 |2019年第4期|3237960.1-3237960.15|共15页
  • 作者

    Hong Jie; Li Tianrang; Liang Zhichao; Zhang Dayi; Ma Yanhong;

  • 作者单位

    Beihang Univ Sch Energy & Power Engn Beijing 100083 Peoples R China|Collaborat Innovat Ctr Adv Aeroengine Beijing 100083 Peoples R China;

    Beihang Univ Sch Energy & Power Engn Beijing 100083 Peoples R China;

    Sci & Technol Complex Aviat Syst Simulat Lab Beijing 100076 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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