A Study on the Aerodynamic Performance Improvement of Axial Flow Fans Using the Bionic Blades Inspired by Seagull Wings
In order to improve the aerodynamic performance of axial flow fan,inspired by the unique structure of seagull wings with good gliding flight performance,this study investigates the effects of blade bionic design on the aerodynamic performance of axial flow fan used in the air conditioners by extracting wing structures at a specific cross-sectional position of the seagull wings.Firstly,the numerical method is used to solve the Reynolds averaged Navier-Stokes(RANS)equations,and the aerodynamic performance and internal flow fields of the axial flow fan with bio-seagull wing blades are analyzed numerically.Then,the large eddy simulation(LES)method and Ffowcs-Williams and Hawkings(FW-H)acoustic analogy theory are adopted to numerically predict the aerodynamic noise of the axial flow fan.The results show that at the designed rotational speed,the aerodynamic efficiency of the axial flow fan with bionic blades based on the seagull wings is improved by 3.1%.At the same flow rate condition,the aerodynamic noise of the axial flow fan with bionic blades is reduced by 1.0 dB(A)compared to the prototype fan.By using the bionic blades inspired by the seagull wings,the static pressure distribution on the blade surfaces of the axial flow fan is uniform,and the pressure pulsation in the middle section of the blade surfaces is significantly reduced.At the same time,the flow separation is suppressed effectively at the inlet hub and blade tip area of the axial flow fan,and the airflow pulsation and non-uniformity caused by blade wake vortex shedding are relatively weakened,which improves the aerodynamic performance of the axial flow fan.
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