City Research Online

Abstract

This study investigates the effectiveness of porous casing treatments in reducing noise in axial flow fans, using various triply periodic minimum surface (TPMS) configurations. All TPMS-based casings outperform solid casings in minimizing radial fan noise and enhancing the casing's sound absorption capabilities. Among the structures, the primitive type is less effective compared to the diamond and gyroid designs. Experimental results demonstrate that the gyroid and diamond casings reduce overall sound pressure levels by 6 dB (11%) and 8 dB (14%), respectively. They also decrease accumulated sound energy by 36% and 60%, respectively. Additionally, increasing porosity from 20% to 50% further enhances accumulated sound energy reduction by 27%. TPMS structures significantly lower sound pressure levels at blade passing frequencies (BPF), with maximum noise reductions observed at BPF4 and BPF10, where noise drops by 6 and 7 dB, respectively. This innovative casing treatment has a marked impact on the aeroacoustic performance of axial flow fans, and the findings offer valuable insights for future noise reduction strategies using TPMS-based porous casings.

Publication Type:	Article
Additional Information:	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Mostafa Mozafari, Mehran Masdari, Qiang Zhang, Mojtaba Tahani; Aeroacoustic impact of triply periodic minimal surface porous casings on axial flow fans. Physics of Fluids 1 January 2025; 37 (1): 017111. and may be found at https://doi.org/10.1063/5.0248030
Publisher Keywords:	Noise reduction, Acoustic, Experimental measurement
Departments:	School of Science & Technology School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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