Research on Aerodynamic Performance Optimization of Axial Flow Fan
In view of the problems such as unstable internal flow field and large pressure loss in an axial flow fan,this paper studies the optimization of geometric parameters of bell mouth,fairing,impeller,guide vane and diffuser inside the fan.This paper selects the rounded diameter of inlet bell mouth,length of the fairing,distance between impeller and guide vane,axial length of diffuser and spherical diameter at the end as orthogonal test factors,and uses the total pressure efficiency as the test evaluation index to study the influence of joint action of inlet bell mouth,fairing,impeller,guide vane and diffuser on aerodynamic performance of the fan;designs the test scheme according to the orthogonal test table,and calculates the aerodynamic performance values of the axial flow fan;obtains the primary and secondary influence sequence of geometric parameters on fan efficiency according to the above tests,and determines the optimal size parameter combination of the axial flow fan.The research results indicate that compared with the prototype fan,the total pressure of the optimized counter-rotating axial flow fan is increased by 381,290 and 142 Pa respectively at the flow rate points of 30,35 and 40 m3/s,and the efficiency is increased by 6.41%,5.25%and 2.31%respectively.
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