<VV> Flow/Pressure/Cooling
ScottyGrover at aol.com
ScottyGrover at aol.com
Wed May 23 23:04:43 EDT 2012
In the HVAC trade, this type of fan is known as a "Backward-inclined" fan
blade, and it is the most efficient fan used in the trade (bur it's not
cheap.)
For what it's worth, anything that closes up the clearances between the
fan and the "turkey roaster" so that air under pressure doesn't revert back
through the fan, bypassing it--this air flow simply wastes energy.
Scotty from Hollyweird
.
In a message dated 5/23/2012 5:43:58 P.M. Pacific Daylight Time,
mfrancis at wi.rr.com writes:
Perhaps what IS important to remember, is that as the stock fan increases
in
RPM, past a certain point, you are not experiencing the same percentage of
flow increase through the heads, so what you have is an increase in
pressure
inside the upper shroud.
This increase in pressure is what causes the fan to consume more
horsepower,
as the turbulence along the tips becomes a tight 'shear' point between the
already pressurized side and the incoming air movement through the vanes.
What might work better, and is reflected in more recent fan designs, is a
curved, swept-back tip around the perimeter of the fan. This would allow
the
fan to 'slide' along the shear point easier and as a result, might consume
less horsepower than the stock fan at the higher RPMs.
Mel Francis
----- Original Message -----
From: "Joel McGregor" <joel at joelsplace.com>
To: <virtualvairs at corvair.org>
Sent: Wednesday, May 23, 2012 7:09 PM
Subject: Re: <VV> Flow/Pressure/Cooling
> Does someone have any references for this? IF this is true I doubt we
> would ever get to this point in our application. I have a hard time
> believing that increasing the pressure could actually decrease flow.
I'm
> not claiming that it is needed. That's a different debate.
> Joel McGregor
> ________________________________________
> From: virtualvairs-bounces at corvair.org
[virtualvairs-bounces at corvair.org]
> On Behalf Of Smitty [vairologist at cox.net]
> Sent: Wednesday, May 23, 2012 6:59 PM
> To: virtualvairs at corvair.org
> Subject: <VV> Costom Fans/ Thrown Belts
>
> Exactly right. Both theory of fluid dynamics and experimental data show
> that at some point, an increased differential in pressure through a
> nozzle
> (cooling fins) has no increase in flow and can actually lead to a
> decrease
> in flow.
>
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