Numerical Study of Aeroacoustics for Centrifugal Fan

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Published: Jun 20, 2023
Keywords:
Aerodynamic noise Unsteady Reynold Averaged Navier-Stokes Large Eddy Simulation Ffowcs Williams and Hawkings

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J. Sriwattanamakin
Sound and Vibration Research Group, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
K. Tontiwattanakul
Sound and Vibration Research Group, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
C. Chumchan
Sound and Vibration Research Group, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
N. Moonpa
Mechanics, Materials, and Engineering Design Research Group, Rajamangala University of Technology Lanna, Chiang Mai 50300, Thailand

Abstract

Aerodynamic noise is one of the considerable factors in centrifugal fan design. Due to the fact that there are number of parameters involved with a description of a fan’s geometry as well as a complex characteristic of airflow, thus bring many difficulties to the study of noise generating mechanism of a centrifugal fan. In this study, the characteristic of fan noise and the outstanding noise source are investigated using an unsteady state flow simulation with an aeroacoustics modelling. Unsteady Reynolds Averaged Navier–Stokes (URANS) and Large Eddy Simulation (LES) are used to predict the derivative of pressure w.r.t. time. Afterward, the acoustic model based on Ffowcs Williams and Hawkings (FW-H) acoustic analogy is applied to calculate monopole and dipole noise sources. Prediction results of aerodynamic noise are compared to an experiment. The results indicate that the surfaces of the blade tips are the dominant tonal noise source, whereas the impeller and volute tongue surfaces are the prominent broadband noise source. Moreover, the characteristic of broadband noise is well predicted by the use of LES coupled with the acoustic model.

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How to Cite
Sriwattanamakin, J., Tontiwattanakul, K., Chumchan, C., & Moonpa, N. (2023). Numerical Study of Aeroacoustics for Centrifugal Fan. Journal of Research and Applications in Mechanical Engineering, 11(1), JRAME–23. Retrieved from https://ph01.tci-thaijo.org/index.php/jrame/article/view/251451
Issue
Vol. 11 No. 1 (2023)
Section
RESEARCH ARTICLES
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