Performance Improvement on Axial-Flow Fan by Imposing Proper Frame Ribs

Abstract:

Generally, most research attempts on the axial-flow fan focus on optimizing rotor blade and tip clearance to enhance its aerodynamic and acoustic performances. Few efforts aim at finding out the appropriate frame rib, which is a supporting and vital part within the air passage and thus has significant influence on the turbulent flow near the blade trailing edge. Therefore, this study intends to investigate the geometrical parameters of the frame rib systematically by using an integrated scheme, which consists of numerical simulation, mockup fabrication, and experimental verification. At first, a high-performance fan (90×90×38 mm³) is constructed to serve as the sample fan for this investigation. Then three geometrical sections (triangle, cylinder, and arc) of frame rib are examined systematically to provide a design guideline on utilizing the appropriate frame rib for enhancing the fan performance.

• Periodical: Applied Mechanics and Materials (Volume 598)
• Pages: 129-134
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.598.129
• Online since: July 2014
• Authors: Sheam Chyun Lin*, Fu Yin Wang, Cheng Ju Chang, Hung Cheng Yen, Yung Jen Cheng
• Keywords: Axial-Flow Fan, CFD Simulation, Frame Rib, Hydraulic Efficiency, System Resistance

References

[1] Chen, Wen-Liang, Aerodynamic and Acoustic Improvements of an Axial-Flow Fan, Master Thesis, Depart. of Mech. Engineering, National Taiwan University of Science and Technology, July (1998).

[2] Ouyang, Pai-Jin, Experimental Analysis on an Innovative Cooling Fan of Notebooks, Master Thesis, Depart. of Mech. Engineering, National Taiwan University of Science and Technology, June (1999).

[3] Chen, Po-Chou, Analysis of Drilling Holes on the Frame for an Axial-Flow Fan, Master Thesis, Depart. of Mech. Engineering, National Taiwan University of Science and Technology, June (2004).

[4] Hill, S. D., Elder, R. L., and McKenzie, A. B., Application of Casing Treatment to an Industrial Axial Flow Fan, Journal of Power and Energy, Pro. Inst. Mech. Engrs, Vol. 212, Part A, pp.225-233, (1998).

DOI: 10.1243/0957650981536754

[5] Thompson, D. W., King, P. I., and Rab, D. C., Experimental Investigation of Stepped Tip Gap Effect on the Performance of a Transonic Axial Flow Compressor Rotator, Journal of Turbomachinery, Vol. 120, pp.477-485, (1998).

DOI: 10.1115/1.2841743

[6] STAR-CD User Manual, (2007).

[7] Yakhot, V., Orszag, S. A., Thangam, S., Gatski, T. B., and Speziale, C. G., Development of Turbulence Models for Shear Flows by a Double Expansion Technique, Physical Fluids, A4, No. 7, pp.1510-1520, (1992).

DOI: 10.1063/1.858424

[8] ANSI/AMCA Standard 210-07 (ANSI/ASHRAE 51). Laboratory Method of Testing Fans for Aerodynamic Performance Rating. Air Movement and Control Association, Inc., (2007).