Abstract
Skewed-swept blade shows excellent performance in improving the efficiency and decreasing the air noise of compressors and gas turbines. A great of research indicates that the flow mechanism of skewed-swept blade is controlling the aggregation of low energy flow in the end wall regions and radial second flow. In this paper numerical research is carried out to study the effects of swept blade on the aerodynamic and aeroacoustic performance of a 77.6-mm-diameter cooling fan. The cooling fans are normally small size and axial, which are widely used to cool the electronic elements. The 3D steady numerical simulations of three fans, which have forward-swept 10° blade, 0° blade and backward-swept 10° respectively, are finished based on the CFD commercial software Fluent. The efficiency and pressure curves of fans are gained and compared with experiment data. Results show that both the forward-swept blade and backward-swept blade worsens the efficiency of the cooling fan. The sweep of blade changes the radial distribution of the axial velocity at the inlet of the fan. The unsteady flows of above three fans are simulated with LES model at a same flow rate 0.99m3/min. The aerodynamic noise sources are gained. Then the levels of noise emitted by the fans are calculated with FW-H equation. Compared with the 0° fan, the forward-swept 10° blade increased the noise about 1.2dB, but the backward-swept 10° blade decrease the noise 1.1dB.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
Murray Hodgson, Isabella Li, 2006, “Experimental Stu-dy of the Noise Emission of Personal Computer Cooling Fans”, Applied Acoustics, Vol.67, pp. 849–863
H.Z. Lu, Lixi Huang, R.M.C. So and J. Wang, 2007, “A computational study of the interaction noise from a small axial-flow fan”, Acoustical Society of America, Vol.122, No.3, pp. 1404–1415
Beiler, M.G.; Carolus, T.H, 1999, “Computation and Measurement of the Flow in Axial Flow Fans with Skewed Blades”, Journal of Turbomachinery, Vol.121, No.1, pp. 59–66
Myung H J, Back J H, 1999, “Mean Velocity Characteristics behind a Forward-Swept Axial-Flow Fan.”, JSME International Journal, Series B, Vol.42, No.3, pp. 476–488
Ailing Yang, Kangmin Chen, 2002, “The Influence of Swept Blades on the Aerodynamic-aeroacoustic Perform-ance of the Rotors of small Axial flow Fans”, Fluid mec-hanics, Vol.30, No.1, pp. 18–20
Huang Xiaolong, 2007, “Study on the Acoustics and Dynamics characters of Cooling Fan Using in Computer”, Ma.D. Thesis, University of Shanghai for Science and Technology
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2009 Tsinghua University Press, Beijing and Springer-Verlag GmbH Berlin Heidelberg
About this paper
Cite this paper
Yang, A., Tang, T., Zhang, H., Chen, K. (2009). Effect of Swept Blade on Performance of a Small Size Axial Fan. In: Xu, J., Wu, Y., Zhang, Y., Zhang, J. (eds) Fluid Machinery and Fluid Mechanics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-89749-1_42
Download citation
DOI: https://doi.org/10.1007/978-3-540-89749-1_42
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-89748-4
Online ISBN: 978-3-540-89749-1
eBook Packages: EngineeringEngineering (R0)