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NUMERICAL ANALYSIS OF UNSTEADY FLOW FIELD AND AEROACOUSTIC NOISE OF AN AXIAL FLOW FAN  

Kim, Wook (서강대학교 대학원 기계공학과)
Hur, Nahm-Keon (강대학교 기계공학과)
Jeon, Wan-Ho ((주)쎄딕 기술연구소)
Publication Information
Journal of computational fluids engineering / v.15, no.4, 2010 , pp. 60-66 More about this Journal
Abstract
Unsteady Reynolds Averaged Navier-Stokes(URANS) and Large Eddy Simulation(LES) simulation of an axial flow fan are calculated upon same conditions and computational grids in order to study aeroacoustic noise of an axial flow fan numerically. Results of computed performance and predicted noise are compared with those of measurement. Both performances show accurate results with a significant difference of less than 5%. However, noise of LES result is more close to measured noise qualitatively than URANS. Levels of tonal noises of both LES and URANS are quite similar with those of measured at BPF(Blade Passing Frequency) in sound spectrum. However, as leading edge separation and tip vortex shedding phenomena of LES are showed more clearly than those of URANS, sound level of broadband noise of LES corresponds better than that of URANS, especially.
Keywords
CFD; Axial Flow Fan; Flow Noise; Aeroacoustic Noise; LES; URANS;
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