Numerical Investigation for Aerodynamic Noise of a Low Mach Number Axial Fan
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Abstract
Typically, the noise generated by axial fans arises from both the motion of mechanical parts and the turbulence of the airflow. When the airflow interacts with the stationary and rotating surfaces of an axial fan, aerodynamic noise is produced. To investigate this phenomenon, the study used unsteady Computational Fluid Dynamics (CFD) simulations with Large Eddy Simulation (LES) to capture the turbulent flow field. The Direct Simulation Method (DSM) and Ffowcs Williams & Hawkings (FW-H) method were used to predict the Sound Pressure Level (SPL) spectra of the aerodynamic noise. The results show that the SPL spectra trend from the DSM and FW-H is consistent at various receive points. However, the SPL spectra from the DSM are lower than that from the FW-H in the far-field noise region. Moreover, the main noise source of an axial fan is found on the propeller surface, which is dominated at the leading edge near the blade tip region.
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This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
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