The optimization design of axial fan is carried out to solve the problem of insufficient airflow under low pressure.A numerical simulation method for solving the flow field of axial fan is established by combining with the method of rotating reference system,and the aerodynamic performance and optimization algorithm are verified based on the test model of axial fan of a certain company.Based on the established CFD method,the effect of the root chord length of the axial fan blade on the aerodynamic performance is studied,and the optimization design of the fan blade with the optimal root chord length is carried out by using the orthogonal test method with the blade mounting angle and swept-forward angle as the optimization parameters,and the aerodynamic and flow field characteristics of the axial fan before and after the optimization are analyzed.The results show that the HUB chord lengths(16 mm and 18 mm)are more suitable for low airflow conditions,the HUB chord length(22 mm)performs better in medium airflow conditions,and the HUB chord length of 20 mm performs best in high airflow conditions;the optimized aerodynamic parameter combinations for the 20 mm HUB chord length areβHUB=45°,βTIP=32°,and α=25°;the optimal value of airflow corresponds to the peak blade mounting angle and minimum forward swept angle corresponds;under medium and high airflow conditions,the airflow of the optimal parameter combination has a maximum increase of 3.18％compared with the pre-optimization,and the efficiency has a maximum enhancement of 0.25％;the total sound pressure level decreases by 3.23 dB(A)compared with that of the original fan blade.
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