Fracture analysis and experimental study of induced draft fan blades under fluctuating flow field

ZANG Sheng; SHEN Deming; YANG Jiangang

doi:10.19666/j.rlfd.202405109

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Fracture analysis and experimental study of induced draft fan blades under fluctuating flow field

Thermal Power Generation Vol. 53, Issue 12, Pages: 129-134(2024)

更新时间：2025-09-28

- Fracture analysis and experimental study of induced draft fan blades under fluctuating flow field
- 作者机构：
  
  1. 东南大学能源与环境学院
  2. 南京科远智慧科技集团股份有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202405109
  CLC： TM62
- Published：2024
- 稿件说明：
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ZANG Sheng, SHEN Deming, YANG Jiangang. Fracture analysis and experimental study of induced draft fan blades under fluctuating flow field[J]. Thermal Power Generation, 2024, 53(12): 129-134.
DOI：

ZANG Sheng, SHEN Deming, YANG Jiangang. Fracture analysis and experimental study of induced draft fan blades under fluctuating flow field[J]. Thermal Power Generation, 2024, 53(12): 129-134. DOI： 10.19666/j.rlfd.202405109.

摘要

针对某型汽动静叶可调引风机叶片断裂故障开展计算分析和试验研究。通过振动试验和模态实验，获取不同转速和开度下风机振动信号以及叶片固有频率，根据相似理论绘制风机不同转速下性能曲线，求得与流量对应的转速-开度曲线，由失速线划定风机运行禁区。试验结果表明，转速一定时，随着静叶开度增大，叶片通过频率及其谐波分量幅值增大，结合模态实验发现风机在796～912 r/min转速区间运行时，叶片固有频率和叶片通过频率及其谐波分量重合，引发叶片共振。风机应避开共振转速区间运行并避免在转速禁区内运行。

Abstract

The calculation analysis and experimental study of blade fracture of a certain type of steam and static adjustable induced draft fan are carried out. Vibration signals and blade natural frequencies of fans at different speeds and openings are obtained through vibration tests and modal experiments. Performance curves of fans at different speeds are drawn according to the similarity theory

and the rotation-opening curves corresponding to the flow rate are obtained. The fan operation restricted zone is delimited by the stall line. The test results show that

when the rotation speed is constant

the amplitude of the blade passing frequency and its harmonic component increase with the stator blade opening. Combining with the modal experiment

it is found that the natural frequency of the blade and the blade passing frequency and its harmonic component coincide when the fan runs in the rotation speed range of 796～912 r/min

resulting in blade resonance. The fan should avoid running in the resonance speed range and avoid running in the speed restricted area.

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