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Article: Fan passive noise reduction
Posted: Wed Oct 31, 2018 9:24 pm
by Hrafn
Re: Article: Fan passive noise reduction
Posted: Wed Oct 31, 2018 11:02 pm
by Olle P
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...
Re: Article: Fan passive noise reduction
Posted: Wed Oct 31, 2018 11:58 pm
by Olle P
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.
Re: Article: Fan passive noise reduction
Posted: Thu Nov 01, 2018 3:20 am
by lodestar
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.
Re: Article: Fan passive noise reduction
Posted: Thu Nov 01, 2018 10:44 am
by mcb
This article (nice find!) suggests a flow straightening grill on the intake side - the Nexus BeamAir seems to do this on the exhaust side.
Re: Article: Fan passive noise reduction
Posted: Thu Jan 03, 2019 6:07 pm
by jango1985
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/