Discrete Noise Prediction of Variable Pitch Cross-Flow Fans by Unsteady Navier-Stokes Computations

[+] Author and Article Information
Yong Cho

Young J. Moon

Department of Mechanical Engineering, Korea University, Seoul 136-701, Koreae-mail: yjmoon@korea.ac.kr

J. Fluids Eng 125(3), 543-550 (Jun 09, 2003) (8 pages) doi:10.1115/1.1568356 History: Received May 08, 2001; Revised November 27, 2002; Online June 09, 2003
Copyright © 2003 by ASME
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A cross-flow fan configuration and the measured internal velocity field, 6
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Cross-flow fan impellers, (a) impeller cross-sections (Z=35), (b) blade pitch angle distributions
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Triangular meshes for the present test model: uniform pitch, 60743 cells (rotating part), 28345 cells (stationary part)
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Time-averaged streamlines patterns and instantaneous vorticity contours: 1000 rpm, ϕ=0.602, (a) streamlines, (b) vorticity
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Grid-dependent test for fan performance prediction
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Comparison of the cross-flow fan performance
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Aerodynamic noise source identification: uniform pitch, ϕ=0.602, (a) acoustic pressure fluctuations along the blade rotation angle (θ), (b) identified noise source positions
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Integration surfaces and geometric parameters used in the FW-H equation
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Monopole and dipole noises generated from the blades: uniform pitch, ϕ=0.602
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Near and far-field dipole noises generated from the blades and stabilizer, (a) rotating blades, (b) stabilizer
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Time histories of acoustic pressure generated from the blades and stabilizer
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Sound pressure level (SPL) spectra: – (NS/FW-H), - - - (Modeling/FW-H, ○: 9 dB or above), (a) uniform (b) random A (c) random B



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