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

Jae Hyuk Jung, Won Gu Joo

Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish
Title of host publicationINTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering
EditorsAntonio Calvo-Manzano, Ana Delgado, Antonio Perez-Lopez, Jose Salvador Santiago
PublisherSOCIEDAD ESPANOLA DE ACUSTICA - Spanish Acoustical Society, SEA
ISBN (Electronic)9788487985317
Publication statusPublished - 2019 Jan 1
Event48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID - Madrid, Spain
Duration: 2019 Jun 162019 Jun 19

Publication series

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

Conference

Conference48th International Congress and Exhibition on Noise Control Engineering, INTER-NOISE 2019 MADRID
CountrySpain
CityMadrid
Period19/6/1619/6/19

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.