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Open AccessArticle

Application of the Symmetric Model to the Design Optimization of Fan Outlet Grills

Department of Creative Product Design, Asia University, Taichung City 41354, Taiwan
Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 404, Taiwan
Department of Mold and Die Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 80778, Taiwan
Author to whom correspondence should be addressed.
Symmetry 2019, 11(8), 959;
Received: 1 July 2019 / Revised: 21 July 2019 / Accepted: 21 July 2019 / Published: 30 July 2019
(This article belongs to the Special Issue Selected Papers from IIKII 2019 conferences in Symmetry)
PDF [25357 KB, uploaded 9 August 2019]


In this study, different designs of the opening pattern of computer fan grills were investigated. The objective of this study was to propose a simulation analysis and compare it to the experimental results for a set of optimized fan designs. The FLUENT computational fluid dynamics (CFD) simulation software was used to analyze the fan blade flow. The experimental results obtained by the simulation analysis of the optimized fan designs were analyzed and compared. The effect of different opening pattern designs on the resulting airflow rate was investigated. Six types of fans with different grills were analyzed. The airflow velocity distribution in the simulated flow channel indicated that the wind speed efficiency of the fan and its influence were comparable with the experimental model. The air was forced by the fan into the air duct. The flow path was separately measured by analog instruments. The three-dimensional flow field was determined by performing a wind speed comparison on nine planes containing the mainstream velocity vector. Moreover, the three-dimensional curved surface flow field at the outlet position and the highest fan rotation speed were investigated. The air velocity distribution at the inlet and the outlet of the fan indicated that among the air outlet opening designs, the honeycomb shaped air outlet displayed the optimal performance by investigating the fan characteristics and the estimated wind speed efficiency. These optimized designs were the most ideal configurations to compare these results. The air flow rate was evenly distributed at the fan inlet. View Full-Text
Keywords: fan design; numerical simulation; fan experiments; axial flow fan; electronics cooling fan design; numerical simulation; fan experiments; axial flow fan; electronics cooling

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Lin, H.-H.; Cheng, J.-H. Application of the Symmetric Model to the Design Optimization of Fan Outlet Grills. Symmetry 2019, 11, 959.

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