Improvement and Optimization of Multi-Blade Centrifugal Fan Impeller Based on Variable Chord Length Blade Design

LEI Jian; QIN Guoliang; CUI Qin; JIA Cheng

doi:10.7652/xjtuxb202308002

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Improvement and Optimization of Multi-Blade Centrifugal Fan Impeller Based on Variable Chord Length Blade Design

更新时间：2025-05-08

- Improvement and Optimization of Multi-Blade Centrifugal Fan Impeller Based on Variable Chord Length Blade Design
- Vol. 57, Issue 8, Pages: 11-21(2023)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202308002
  CLC： TK05;TH432
- Online First：10 August 2023，
  
  Published：2023
- 稿件说明：
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LEI Jian, QIN Guoliang, CUI Qin, et al. Improvement and Optimization of Multi-Blade Centrifugal Fan Impeller Based on Variable Chord Length Blade Design[J]. 2023, 57(8): 11-21.
DOI：

LEI Jian, QIN Guoliang, CUI Qin, et al. Improvement and Optimization of Multi-Blade Centrifugal Fan Impeller Based on Variable Chord Length Blade Design[J]. 2023, 57(8): 11-21. DOI： 10.7652/xjtuxb202308002.

摘要

针对多翼离心风机蜗壳宽度大、叶片短引起的轴向进气流量分布不均匀和叶道回流现象

提出变弦长叶片的设计方法

以多翼离心风机叶轮为研究对象

开展了叶轮前缘的参数化优化。使用有5个控制点的贝塞尔曲线构建叶轮前缘

建立了支持向量回归代理模型

设置了效率与静压的优化目标

通过遗传优化算法对选取的控制点参数进行了优化。设计结果表明:变弦长叶片设计提升了多翼离心风机的通流能力

体积流量最大提升至35.7 m

/h。流场分析发现

变弦长叶片设计的叶轮沿叶高方向的流量分布更均匀

特别是在靠近轮盖侧速度小于0的区域

流量几乎消除

轮盘截面的通流占比提升29.8%

叶道回流现象得到明显改善

变弦长叶片叶轮的做功能力更强。优化后

变弦长叶片多翼离心风机的气动性能得到显著提高

大流量方向的工况范围得以拓宽

小流量工况下的效率提升了4.9%

风机的静压能力最大提高了91.1 Pa。研究为多翼离心风机内部流动控制、多翼离心风机变弦长叶片优化设计提供了理论基础和工程实践。

Abstract

In view of the uneven distribution of axial inlet flow and the backflow of the blade passage caused by the large volute width and short blades of the multi-blade centrifugal fan

this paper proposes a design method of variable chord length blades. With the multi-blade centrifugal fan impeller as the research object

the parametric optimization of the impeller leading edge is carried out. The leading edge is constructed using the Bezier curve with five control points

the support vector regression proxy model is established

the optimization o

bjectives for efficiency and static pressure are set

and the parameters of the selected control points are optimized by genetic optimization algorithm. The variable chord long blade design improves the flow capacity of the multi-blade centrifugal fan

resulting in a maximum volume flow increase to 35.7 m

/h. The analysis of the flow field reveals that the impeller designed with variable chord length blades has a more uniform flow distribution along the blade height direction

especially in the area near the shroud side where the velocity is less than 0

and the flow ratio of the disk section increases by 29.8%. The channel backflow phenomenon is significantly improved

and the working ability of the impeller with variable chord length blades is relatively stronger. Based on the variable chord length blade design

the aerodynamic performance of the multi-blade centrifugal fan is greatly improved

the operating range in the large flow direction is widened

the efficiency increases by 4.9% under the small flow condition

and the static pressure capacity of the fan increases by up to 91.1 Pa. This research provides the theoretical basis and engineering practice value for the internal flow control and the variable chord length blade design of multi-blade centrifugal fans.

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references

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