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az native
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Aerodynamic Diffuser

07/16/2011 2:19 AM

Dear all-I need information about principles of work and any data for an aerodynamic diffuser that should convert air flow to air pressure.
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Tornado
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#1

Re: aerodynamic diffuser

07/16/2011 2:57 AM

joe.fordham has tried to be inspirational on this front....

One method would be to use a windmill to drive a simple reciprocating compressor, such as a tire pump.

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Ace Boeringa
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#2

Re: aerodynamic diffuser

07/16/2011 8:20 AM

Any diffuser that creates a restriction to flow will cause a higher pressure to be created upstream of the diffuser.

Also a pitot tube will convert air flow to air pressure directly. The relationship of the pressure being proportional to the square of the velocity is a well documented physical property. They have been widely used in commercial, industrial and aviation applications for many decades.
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lyn
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#3
In reply to #2

Re: aerodynamic diffuser

07/16/2011 11:12 AM

You're a whole lot smarter than you look.
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Anonymous Poster #1
#4
In reply to #3

Re: aerodynamic diffuser

07/17/2011 12:29 AM

& you're not.....
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Anonymous Poster #2
#5
In reply to #4

Re: aerodynamic diffuser

07/17/2011 12:43 AM

How do you know? Or are you assuming he looks like a barn?
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Anonymous Poster #1
#6
In reply to #5

Re: aerodynamic diffuser

07/17/2011 12:53 AM

That is insulting to barns everywhere

My sincerest apologies...
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Ed Weldon
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#7

Re: Aerodynamic Diffuser

07/17/2011 2:30 AM

az native: Look to the world of centrifugal pump design for discussion of the principles of efficient diffuser design. Air flow in conventional fans is for all practical purposes incompressible fluid flow. So the the same analytical techniques that apply to pumps (for incompressible liquids) apply to fans.

If this is getting too deep for non engineering types there are some simpler explanations that are a bit harder to frame in a few words. But try us.

Any CR-4 types out there who have a favorite internet reference link? ....... Ed Weldon
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az native
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#8
In reply to #7

Re: Aerodynamic Diffuser

07/17/2011 4:18 AM

Frankly, I can't understand how air in a centrifugal fan is incompressible?!

Is this typically only to centrifugal fan?

I tried to find some information about it through wikipedia, but without any success.
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pritam
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#9
In reply to #8

Re: Aerodynamic Diffuser

07/17/2011 5:28 AM

how air in a centrifugal fan is incompressible?!

You have forgot the term 'all practical purposes' he has used. In centrifugal fans pressure rise is small, so change in density is almost negligible for practical purposes. But where pressure rise is in thousands of mmwc we can not ignore and we have to treat it like compressible.
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PWSlack
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#10

Re: Aerodynamic Diffuser

07/18/2011 7:04 AM

All nozzles do that.

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Users who posted comments:

Ace Boeringa (1); Anonymous Poster (3); az native (1); Ed Weldon (1); lyn (1); pritam (1); PWSlack (1); Tornado (1)

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