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 Post subject: Article: Fan passive noise reduction
PostPosted: Wed Oct 31, 2018 9:24 pm 
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Joined: Sat Oct 12, 2013 9:09 am
Posts: 71
Passive noise reduction: Options for Axial and Centrifugal Fans

(Hat-tip Overclock.net)


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 Post subject: Re: Article: Fan passive noise reduction
PostPosted: Wed Oct 31, 2018 11:02 pm 
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Joined: Tue Nov 04, 2008 6:03 am
Posts: 621
Location: Sweden
Interesting article!

Pop Quiz:
Looking at the noise/frequency graph on the third page, ...
1. What was the fan speed?
2. How many blades on the fan?

Hint:
There can be a merit in playing submarine sims...


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 Post subject: Re: Article: Fan passive noise reduction
PostPosted: Wed Oct 31, 2018 11:58 pm 
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Joined: Tue Nov 04, 2008 6:03 am
Posts: 621
Location: Sweden
A reflection of mine is that the exhaust diffuser cone is pure rocket science.
Not as in "difficult" but as in "how to define the proper shape and size of the end bell".
On a rocket engine you want the exhaust gas pressure to be identical to that of the surrounding atmosphere at the point where it leaves the bell. The same apply to the fans here.


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 Post subject: Re: Article: Fan passive noise reduction
PostPosted: Thu Nov 01, 2018 3:20 am 
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Joined: Fri Aug 05, 2005 3:29 am
Posts: 1679
Location: UK
Overclock.net wrote:
...One solution to reduce the noise generating disruptions to the inflow is to deploy an air straightening grill on the fan intake.
There was of course the Nexus BeamAir which was designed to do precisely this but never caught on.

Image


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 Post subject: Re: Article: Fan passive noise reduction
PostPosted: Thu Nov 01, 2018 10:44 am 
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Joined: Sat Aug 24, 2002 10:24 pm
Posts: 32
Location: San Francisco
This article (nice find!) suggests a flow straightening grill on the intake side - the Nexus BeamAir seems to do this on the exhaust side.


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 Post subject: Re: Article: Fan passive noise reduction
PostPosted: Thu Jan 03, 2019 6:07 pm 
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Joined: Tue Mar 28, 2017 1:50 am
Posts: 2
This got me googling and I came across an article about the noise impact of different grill patterns. https://www.pugetsystems.com/labs/artic ... Noise-107/


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