Full
Outline
To address the aerodynamic noise issue in axial flow fans caused by tip leakage flow，a noise reduction structure combining “bionic serrations-suction surface tip winglet modification-multi‑scheme grooving” was designed.Using the SBES（stress‑blended eddy simulation） turbulence model coupled with the FW-H acoustic analogy method，the noise reduction mechanisms of each structure were analyzed.The results show that the combination of a biomimetic wavy leading‑edge serration with a suction side tip winglet modification can reduce the overall sound pressure level by 4.5dB.Further combining this with a tip longitudinal airfoil ribbed slot structure leads to a reduction of 7.9dB in the overall sound pressure level.The biomimetic leading‑edge serration-suction side tip winglet modification reduces the discrete noise peaks by disrupting the periodic shedding of leakage vortices，optimizes the flow uniformity at the tip，and suppresses abrupt local pressure fluctuations.The combined structure of biomimetic leading‑edge serrations，tip longitudinal airfoil ribbed slots，and suction side tip winglets accelerates vortex energy dissipation by dynamically dividing the leakage flow paths.In experiments，the prototype demonstrated significant noise reduction effects，and the observed phenomenon of “low‑frequency noise energy shifting to high frequencies” was consistent with the numerical simulation results，verifying the reliability of the proposed method.This study provides a reference for the optimization design of low‑noise axial flow fan tips.
138
58
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
