Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan

Jae Hyuk Jung; Won Gu Joo

Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan

Jae Hyuk Jung, Won Gu Joo

Department of Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

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.

Original language	English
Title of host publication	INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering
Editors	Antonio Calvo-Manzano, Ana Delgado, Antonio Perez-Lopez, Jose Salvador Santiago
Publisher	SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA
ISBN (Electronic)	9788487985317
Publication status	Published - 2019 Jan 1
Event	48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID - Madrid, Spain Duration: 2019 Jun 16 → 2019 Jun 19

Publication series

Name	INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering

Conference

Conference	48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID
Country	Spain
City	Madrid
Period	19/6/16 → 19/6/19

All Science Journal Classification (ASJC) codes

Acoustics and Ultrasonics

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Jung, J. H., & Joo, W. G. (2019). Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan. In A. Calvo-Manzano, A. Delgado, A. Perez-Lopez, & J. S. Santiago (Eds.), INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering (INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering). SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA.

Jung, Jae Hyuk ; Joo, Won Gu. / Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan. INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. editor / Antonio Calvo-Manzano ; Ana Delgado ; Antonio Perez-Lopez ; Jose Salvador Santiago. SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA, 2019. (INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering).

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title = "Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan",

abstract = "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.",

author = "Jung, {Jae Hyuk} and Joo, {Won Gu}",

year = "2019",

month = jan,

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editor = "Antonio Calvo-Manzano and Ana Delgado and Antonio Perez-Lopez and Santiago, {Jose Salvador}",

booktitle = "INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering",

note = "48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID ; Conference date: 16-06-2019 Through 19-06-2019",

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Jung, JH & Joo, WG 2019, Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan. in A Calvo-Manzano, A Delgado, A Perez-Lopez & JS Santiago (eds), INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering, SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA, 48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID, Madrid, Spain, 19/6/16.

Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan. / Jung, Jae Hyuk; Joo, Won Gu.

INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. ed. / Antonio Calvo-Manzano; Ana Delgado; Antonio Perez-Lopez; Jose Salvador Santiago. SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA, 2019. (INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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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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Y2 - 16 June 2019 through 19 June 2019

ER -

Jung JH, Joo WG. Analysis on hub vortex and the improvement of hub shape for noise reduction in an axial flow fan. In Calvo-Manzano A, Delgado A, Perez-Lopez A, Santiago JS, editors, INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. SOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA. 2019. (INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering).