Influence of Non-Uniform Blade Tip Clearance on the Performance of a Large Axial Flow Fan

被引：0
|
作者：
Cheng K. [1 ]
Chen Y. [1 ]
Meng F. [1 ]
Li J. [1 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2022年 / 56卷 / 10期
关键词：
axial-flow fan; leakage vortex; non-uniform clearance; non-uniformity; numerical simulation;
D O I：
10.7652/xjtuxb202210018
中图分类号：
学科分类号：
摘要：
This research was conducted to explore the influence of a non-uniform change of blade tip clearance along the circumferential direction on the performance of a large low-pressure axial flow fan. In this research, a large civil low-pressure axial flow fan was taken as the research object, with two key parameters (namely, the average clearance and the non-uniformity) representing the circumferential non-uniform clearance of the axial flow fan selected as the influencing factors. Steady and unsteady numerical simulations were conducted to research the influence of circumferential non-uniform blade tip clearance on the external characteristics of the fan, and on the blade tip clearance flow and flow filed change. The results show that both the increase in the average clearance and non-uniformity of the axial flow fan led to the decrease of the fan's efficiency and static pressure, and the influence caused by the change of the average clearance is significantly greater than that by non-uniformity. When the clearance is large, blade tip leakage flows include not only the main leakage flow with a vortex core, but also an additional leakage flow without a vortex core. The non-uniform blade tip clearance will change the starting position and development direction of blade tip leakage flow. In addition, the blade tip leakage flow will be subject to a periodic change due to the entrainment of the leakage vortex from its leading blade. This research is helpful in the design and efficient operation of low-pressure axial flow fans. © 2022 Xi'an Jiaotong University. All rights reserved.
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页码：180 / 189
页数：9
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