Numerical analysis and test of dynamic frequency for low pressure last stage long turbine blade with self-locking shoulder

GU Weiwei; ZHANG Yonghai; LI Yuan; QU Jie; MA Tingshan; JU Wenping; ZHANG Shiguo

doi:10.19666/j.rlfd.202208186

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Numerical analysis and test of dynamic frequency for low pressure last stage long turbine blade with self-locking shoulder

更新时间：2025-09-28

- Numerical analysis and test of dynamic frequency for low pressure last stage long turbine blade with self-locking shoulder
- Thermal Power Generation Vol. 51, Issue 12, Pages: 79-85(2022)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 高效灵活煤电及碳捕集利用封存全国重点实验室
  3. 北京北重汽轮电机有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202208186
  CLC： TK263.3
- Published：2022
- 稿件说明：
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GU Weiwei, ZHANG Yonghai, LI Yuan, et al. Numerical analysis and test of dynamic frequency for low pressure last stage long turbine blade with self-locking shoulder[J]. Thermal power generation, 2022, 51(12): 79-85.
DOI：

GU Weiwei, ZHANG Yonghai, LI Yuan, et al. Numerical analysis and test of dynamic frequency for low pressure last stage long turbine blade with self-locking shoulder[J]. Thermal power generation, 2022, 51(12): 79-85. DOI： 10.19666/j.rlfd.202208186.

摘要

带凸肩自锁结构汽轮机低压末级长叶片在不同工作转速下由于凸肩接触面接触状态和接触应力不同而导致叶片叶轮系统的振动频率不同，呈现典型的非线性特征，造成叶片叶轮系统振动特性的数值分析存在一定困难。针对某制造厂新设计开发的大刚度高强度880 mm低压末级长叶片，采用有限元接触方法计算分析了不同转速下叶片凸肩接触面的接触面积、接触应力等接触状态，进而计算分析了该状态下叶片叶轮系统不同节径不同阶数的振动频率。最后，采用无线电非接触测试方法在动平衡舱测试了该叶片叶轮系统在1 300～3 200 r/min转速范围内的“三重点”共振频率及共振转速，并与数值分析结果进行了比较。结果表明，数值计算结果与试验结果基本吻合，880 mm叶片叶轮系统在工作转速附近不存在“三重点”共振。

Abstract

The vibration frequency of the last stage long turbine blade with self-locking shoulder is different due to the different contact states and contact stress of the working surface at different rotating speeds

which presents typical non-linear characteristics

and resulting in certain difficulties in numerical analysis for the turbine blade vibration characteristics. In this paper

the finite element contact method is used to analyze the contact area

contact stress and other contact states of a low-pressure last stage long blade at different rotating speeds

and then the vibration characteristics of the blade system at different pitch diameters and different orders are analyzed. Finally

the “3-coincide point” resonance frequency and resonance speed of the blade in the rotating speed range of 1 300～3 200 r/min are measured in the dynamic balance chamber by using the radio non-contact testing method

and the results are compared with the numerical results. The comparison shows that

the experimental results are consistent with the numerical calculation results

and the 880 mm blade-disk system does not have “3-coincide point”resonance near the working speed.

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