摘要
优化叶顶间隙形态可有效改善轴流风机的性能。以OB-84型动叶可调轴流风机为对象,采用Fluent模拟了均匀间隙及非均匀间隙下的风机性能,探讨了不同间隙形态对间隙内泄漏流场及损失分布的影响。研究表明:在平均叶顶间隙不变的前提下,采用渐缩型间隙的风机全压与效率均高于均匀间隙,高效区范围扩大,且渐缩程度越大,性能提升越显著;渐缩型间隙改变了间隙内涡量场的分布,叶顶泄漏损失减少,叶片中上部做功能力增强。而采用渐扩型间隙后做功能力下降,风机性能均低于均匀间隙。渐缩型叶顶间隙形态可作为一种提高风机性能的重要手段加以实施。
The performance of the axial fan can be improved by optimization of blade tip pattern effectively. For a variable pitch axial flow fan of OB-84 type, the performance of the fan with uniform tip clearance and non-uniform tip clearance are simulated by using Fluent. The impacts of tip patterns on leakage flow field and loss distribution in the tip clearance are examined. The results reveal that when average tip clearance keeps constant, the total pressure rise and efficiency of the fan with convergent tip clearance patterns are higher than those of uniform tip clearance, and the domain of higher efficiency is expanded. With the increase of convergent level, the improvement of performance tends to be appreciable. Convergent tip clearance changes the distribution of vorticity field, resulting in the reduction of leakage losses of blade tip and the promotion of work capability in the middle and upper part of blade. When the divergent tip clearance patterns are employed, the work capability of blade is declined, leading to slightly decreased fan performance compared to the uniform blade tip. The convergent tip clearance pattern is considered as a preferred mean to improve fan performance in practical applications.
作者
叶学民
崔建光
李春曦
Ye Xuemin, Cui Jianguang, Li Chunxi(Key Lab of Condition Monitoring and Control for Power Plant Equipment of Education Ministry （North China Electric Power University）, Baoding 071003, China)
出处
《系统仿真学报》
CAS
CSCD
北大核心
2018年第10期3939-3948,共10页
Journal of System Simulation
关键词
轴流风机
叶顶间隙形态
气动性能
泄漏流
内流特征
axial flow fan
tip clearance pattems
aerodynamic performance
leakage flow
internal dynamics
