![Sub-harmonic broadband humps and tip noise in low-speed ring fans: The Journal of the Acoustical Society of America: Vol 139, No 1 Sub-harmonic broadband humps and tip noise in low-speed ring fans: The Journal of the Acoustical Society of America: Vol 139, No 1](https://asa.scitation.org/action/showOpenGraphArticleImage?doi=10.1121/1.4939493&id=images/medium/1.4939493.figures.f5.gif)
Sub-harmonic broadband humps and tip noise in low-speed ring fans: The Journal of the Acoustical Society of America: Vol 139, No 1
![Sub-harmonic broadband humps and tip noise in low-speed ring fans: The Journal of the Acoustical Society of America: Vol 139, No 1 Sub-harmonic broadband humps and tip noise in low-speed ring fans: The Journal of the Acoustical Society of America: Vol 139, No 1](https://asa.scitation.org/action/showOpenGraphArticleImage?doi=10.1121/1.4939493&id=images/medium/1.4939493.figures.f12.gif)
Sub-harmonic broadband humps and tip noise in low-speed ring fans: The Journal of the Acoustical Society of America: Vol 139, No 1
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![Sub-harmonic broadband humps and tip noise in low-speed ring fans: The Journal of the Acoustical Society of America: Vol 139, No 1 Sub-harmonic broadband humps and tip noise in low-speed ring fans: The Journal of the Acoustical Society of America: Vol 139, No 1](https://asa.scitation.org/action/showOpenGraphArticleImage?doi=10.1121/1.4939493&id=images/medium/1.4939493.figures.f9.gif)