TY - GEN
T1 - Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan
AU - Jung, Jae Hyuk
AU - Joo, Won Gu
N1 - Publisher Copyright:
© INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All Rights Reserved.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2019
Y1 - 2019
N2 - This study aimed to reduce the flow induced noise in an axial flow fan installed in the outdoor unit of an air conditioner. This study found the reduced fan efficiency due to a vortex produced by the flow separated from the edge of the hub entrance via affecting the fan blade. The vortex increased the turbulent intensity in the fan's wake, which is a major noise source of the fan. This study proposes a new shape for a hub to reduce the hub vortex. The size of the new hub is extremely small, which is 13.6% of the size of the existing hub. The axial fan with the new hub was named “Hubless fan” in this study. Computational fluid dynamics (CFD) analysis on the flow field revealed that the vortex was significantly reduced in the Hubless fan and this resulted in reduction of the turbulent intensity and vorticity in the wake. By measuring the noise of the Hubless fan with microphones in an anechoic room for experimental verification, reduction of the broadband noise at the certain frequencies on the noise spectrum and reduction of the overall sound pressure level by 1.2 dB compared to existing fans were confirmed.
AB - This study aimed to reduce the flow induced noise in an axial flow fan installed in the outdoor unit of an air conditioner. This study found the reduced fan efficiency due to a vortex produced by the flow separated from the edge of the hub entrance via affecting the fan blade. The vortex increased the turbulent intensity in the fan's wake, which is a major noise source of the fan. This study proposes a new shape for a hub to reduce the hub vortex. The size of the new hub is extremely small, which is 13.6% of the size of the existing hub. The axial fan with the new hub was named “Hubless fan” in this study. Computational fluid dynamics (CFD) analysis on the flow field revealed that the vortex was significantly reduced in the Hubless fan and this resulted in reduction of the turbulent intensity and vorticity in the wake. By measuring the noise of the Hubless fan with microphones in an anechoic room for experimental verification, reduction of the broadband noise at the certain frequencies on the noise spectrum and reduction of the overall sound pressure level by 1.2 dB compared to existing fans were confirmed.
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M3 - Conference contribution
AN - SCOPUS:85084160123
T3 - INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering
BT - INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering
A2 - Calvo-Manzano, Antonio
A2 - Delgado, Ana
A2 - Perez-Lopez, Antonio
A2 - Santiago, Jose Salvador
PB - SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA
T2 - 48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID
Y2 - 16 June 2019 through 19 June 2019
ER -