对旋轴流通风机变转速与变安装角匹配性能分析

Analysis of the matching performance under variable speed and blade mounting angle of counter-rotating axial flow fan

为研究前后两级叶轮转速与叶片安装角对对旋轴流通风机的性能影响,找到不同工况下各参数的最佳匹配关系,对通风机进行数值模拟。首先设计合适的正交表,以尽量提高通风机全压效率、全压为目标对通风机进行正交优化试验;然后通过极差分析方法,得到各个工况对应的最优组合方案。结果表明:与原模型相比,优化后的通风机内部流场得到了改善,降低了损失;对于该种对旋轴流通风机,采用最优组合方案,平均全压效率比原通风机提高了12.80%,全压提高了24.22%。利用正交优化法,可以得到通风机在不同工况下所对应的各可调节参数的数值,从而为提高通风机的性能提供指导。

In this paper,numerical simulation of the fan was carried out to study the influences of the two-stage impeller speed and blade mounting angle on the performance of the counter-rotating axial fan,and find the optimum matching relationship of various parameters under different working conditions.Firstly,an appropriate orthogonal table was designed,and orthogonal optimization tests were performed on the axial fan in order to improve the total pressure and the total pressure efficiency.Then,optimal combination schemes of different working conditions were gained through the method of range analysis.The results showed th at,compared with the original model,the internal flow field of the optimized fan became better and the loss was reduced.For this counter-rotating axial fan,the average total pressure efficiency increased by 12.80%and the total pressure increased by 24.22%.It is found that the values of adjustable parameters of the axial fan under different working conditions can be obtained by the orthogonal optimization method.This paper provides the guidance for improving the performance of the fan.