Abstract
Optimization design of an impeller is critical for the energy performance of a fan. This paper takes the promotion of fan efficiency and pressure rise as the optimization objectives to carry out multiparameter and multiobjective optimization research. Firstly, an experimental test bench is built to measure the energy performance of the original fan and verify the accuracy of the numerical method. Then, the hub outlet angle of impeller β1, the impeller outlet angle increment Δβ1, the wrap angle φ, the hub outlet angle of diffuser β2, and the diffuser outlet angle increment Δβ2 are set as the optimal parameters to conduct orthogonal optimal design. The results show that the efficiency of the optimal fan increases by 11.71%, and the pressure rise increases by 50.15%. The pressure and velocity distributions in an optimal fan are uniform, the internal flow separation is weakened, and the influence of tip leakage flow is reduced, which makes for the improvement of energy performance for the fan.
Highlights
As the fan is widely applied in national defense construction and industrial production, it plays a significant role in the national economy and daily life [1]
The influence of the blade inlet angle at 25–36 degrees on the flow field of the fan has been explored [14], and the results demonstrate that the performance of the fan is promoted by 6% when the blade inlet angle is 27 degrees
The results indicate that the fan exhibits significant differences among different structure combinations under lower operating pressures
Summary
As the fan is widely applied in national defense construction and industrial production, it plays a significant role in the national economy and daily life [1]. The efficiency of the fan is relatively low, resulting in a huge waste of energy. The investigation into fan optimization is of great significance for energy conservation, emission reduction and the improvement of energy allocation. Due to the complicated geometry of the fan, the gas flow characteristics and internal mechanism is complex. There are multiplex phenomena such as flow separation and vortex loss [2,3], which relates to the performance and efficiency of the fluid machinery. In order to promote the efficiency, it is necessary to study the flow characteristics and structure optimization. As multiple structural parameters need to be considered for the fan design and each parameter has a certain value range, which has different influence degrees on the aerodynamic performance of the fan
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