• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2019, Vol. 55 ›› Issue (14): 151-159.doi: 10.3901/JME.2019.14.151

• 可再生能源与工程热物理 • 上一篇    下一篇


李春曦, 范福伟, 刘宏凯, 叶学民   

  1. 华北电力大学电站设备状态监测与控制教育部重点试验室 保定 071003
  • 收稿日期:2018-10-14 修回日期:2019-03-25 出版日期:2019-07-20 发布日期:2019-07-20
  • 通讯作者: 李春曦(通信作者)女,1973出生,博士,教授。主要从事流体机械、流体动力学理论及应用研究。E-mail:leechunxi@163.com
  • 基金资助:

Simulation on Aerodynamic Performance of a Variable-pitch Axial Flow Fan with Chordwise Swept Blades

LI Chunxi, FAN Fuwei, LIU Hongkai, YE Xuemin   

  1. Key Lab of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Baoding 071003
  • Received:2018-10-14 Revised:2019-03-25 Online:2019-07-20 Published:2019-07-20

摘要: 叶片弦向弯掠技术是提升轴流风机气动性能的有效手段。针对带后置导叶的OB-84型单级动叶可调轴流风机,利用Ansys数值软件,对比叶片掠设计前后风机的性能曲线和内流特征,开展静力结构特性分析并进行了噪声预估,探究了前掠角度在不同动叶安装角下的影响。结果表明:设计安装角下,前掠叶片能有效提高叶轮做功能力和导叶扩压能力,减少泄漏损失,提升风机整体性能,在小流量侧和大流量侧效果更明显;设计流量下前掠8.3°性能最优,全压和效率分别提升2.1%和1.68%,但气动噪声有所增大;叶片掠向改型后虽变形增大,但仍满足材料强度要求;在变安装角下,前掠叶片风机性能均有所降低。设计安装角下所得最佳前掠角度适用于长期带基本负荷的轴流风机。

关键词: 动叶可调轴流风机, 静力结构分析, 气动性能, 弦向掠叶片, 噪声预估

Abstract: The chordwise swept blades is an effective way to improve the aerodynamic performance of large axial fans. For a single-stage variable-pitch axial fan of type OB-84 with rear guide vanes, the aerodynamic performance and internal dynamics of the fan before and after blade sweeping are simulated with Ansys software, the static structure features are investigated, and the noise is predicted, as well as the influence of the sweep angle at different blade angles is examined. Simulated results show that under the design blade angle, the forward-swept blade can effectively raise the working ability of impeller and pressure recovery ability of guide vanes, reduce the leakage loss, and then the fan performance is improved, especially in the small and large flow rate. The forward-swept angle of 8.3° has the best performance at the design point and the total pressure and efficiency are increased by 2.1% and 1.68%, but the noise is increased. After the blades swept, the aggravated deformation still meets the requirements of material strength. The performance of the forward swept blade fan is reduced under variable blade angle conditions, so the best forward-swept angle obtained at the design blade angle is suitable for fans operating at rated loads.

Key words: aerodynamic performance, chord swept blades, noise prediction, static structural analysis, variable-pitch axial fan