Open Access

ARTICLE

A Numerical Investigation on the Influence of the Circular Ring on the Aerodynamic Noise Generated by a Cooling Fan

by Jun Feng^1,2, Tao Bian^1,2,5, Qianpeng Han², Bing Wang^1,3,4,*

1 State Key Laboratory of Precision Blasting, Jianghan University, Wuhan, 430056, China
2 School of Intelligent Manufacturing, Jianghan University, Wuhan, 430056, China
3 Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering, Jianghan University, Wuhan, 430056, China
4 Institute for Interdisciplinary Research, Jianghan University, Wuhan, 430056, China
5 Guangdong HUST Industrial Technology Research Institute, Dongguan, 523429, China

* Corresponding Author: Bing Wang. Email:

Fluid Dynamics & Materials Processing 2023, 19(1), 1-14. https://doi.org/10.32604/fdmp.2023.018275

Received 12 July 2021; Accepted 23 May 2022; Issue published 02 August 2022

Abstract

The influence of the width of the circular ring of a car cooling fan on the aerodynamic noise is investigated numerically through the determination of the overall sound pressure level (OASPL). The results demonstrate that when the circular rings cover near 2/3 of the width of the blade tips of the rotor in the axis direction, the rotor has the lowest OASPL and the related total pressure efficiency and flow mass rate are better than the corresponding values obtained for a reference rotor without a circular ring. With increasing the width of the circular ring in the axis direction, the tip vortex around the trailing edge of the blade tip becomes smaller and finally disappears. Meanwhile, a separated flow field arises gradually and then grows in size around the middle of the junction of the blade tips with the ring. When the circular rings cover nearly 2/3 s of the width of the blade tips of the fan in the axis direction, the extension of the separated flow around the blade ’s tip attains a minimum.

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