Effect of abnormal deflection of the second stage rotor blade on stall of axial fan

ZHANG Lei; QU Yaopeng; WANG Songling; DENG Yuhan; LI Kang

English

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Effect of abnormal deflection of the second stage rotor blade on stall of axial fan

Thermal Power Generation Vol. 46, Issue 7, Pages: 121-125(2017)

更新时间：2025-09-28

- Effect of abnormal deflection of the second stage rotor blade on stall of axial fan
- 作者机构：
  
  华北电力大学电站设备状态监测与控制教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621
- Published：2017
- 稿件说明：
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ZHANG Lei, QU Yaopeng, WANG Songling, et al. Effect of abnormal deflection of the second stage rotor blade on stall of axial fan[J]. Thermal Power Generation, 2017, 46(7): 121-125.
DOI：

ZHANG Lei, QU Yaopeng, WANG Songling, et al. Effect of abnormal deflection of the second stage rotor blade on stall of axial fan[J]. Thermal Power Generation, 2017, 46(7): 121-125. DOI：

摘要

动叶可调式轴流风机叶片角度异常偏转时可能会诱发轴流风机失速。为了探讨这种影响规律

本文以两级动叶可调式轴流风机为研究对象

对第二级动叶轮中2个相邻叶片异常偏转角为+9°时轴流风机内的失速现象进行非定常数值模拟。结果表明:虽然叶片偏转降低了轴流风机的出口静压

但使轴流风机的稳定运行范围有所增加;失速先兆最先出现在第二级动叶片前缘叶顶;带有异常叶片和正常叶片的轴流风机内均经历了失速先兆的产生、发展、合并

最后演化为完整的失速团4个阶段;异常叶片的周向分布规律与正常叶片相同

均为周向均匀分布;异常叶片使失速先兆数量和演化为失速团的时间增加

虽然失速团数量没变

但生成的失速团的影响范围较正常轴流风机有所减小。

Abstract

Taking a two-stage axial fan with adjustable vanes as the research object

the 3D unsteady numerical simulation was conducted on the axial fan with abnormal installation angle of the second rotor. The abnormal installation angles of two adjacent blade in the second rotor were +9°. The numerical results show that

although the blade's abnormal deflection reduces the static pressure at the fan outlet

the stable operating range of the fan is increased. Stall inception firstly appears at top of the second blade leading edge. Both normal fan and the fan with +9° abnormal angle experience four stages before entering stall: appearance

development

merge and developing into stall cell. The circumferential distribution of the stall inception could not be changed by abnormal blade

and the circumferential distribution of both fans are uniform. Although the evolution time of the stall cell is reduced because of the abnormal blade

but the influence of the stall cell is lower than that of the normal fan. The results have great significance for understanding the complex phenomenon of rotating stall in multi-stage axial turbo machines

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