Building a Flow bench, was: Measuring air flow

[Kris Weldy]

All very good points-what about powering the turbo with a torch?LOL....
Combine the torch with a blower ,just brainstorming how we could possibly
scale a ubo setup on a flow bench-if we can get a turbo to flow the same cfm
as the head ,then that would be a great combo.---Your friend,
Kris Weldy
Arlington Texas
88supra turbo auto 9.1 1/8th
aim :volvofam3     --
yahoo:supratheonlywaytofly
www.turboboss.com
----- Original Message -----
From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
To: <diy_efi at diy-efi.org>
Sent: Monday, January 28, 2002 3:21 AM
Subject: Re: Building a Flow bench, was: Measuring air flow


> Kris  Weldy tapped away at the keyboard with:
> > From: "Bernd Felsche" <bernie at innovative.iinet.net.au>
> > > If you're looking at comparable flow rates, you need a powerful
> > > motor and a comparably-efficient means of moving air. Back in 1979,
> > > I built a flow rig that used a large Rootes blower off a Nissan
> > > truck, driven by a 10hp electric motor. A 200-litre drum was used as
> > > a (tunable) flow damper.
>
> > What would that power be -compared to a roots blower,one uses
> > torque supplied from the motor ,the other uses expanding exhaust
> > gases..
>
> And the _cooling_ of the gases. The thermal gradient across the
> turbine is very significant.
>
> In the case of the test rig, the blower was used to draw air through
> the test rig; not to blow it. There were a number of reasons for
> that; one that comes to mind is that there would be no heat of
> compression in the _test_ flow. Another was that it made for
> more-convenient instrumentation (manometers open to atmosphere).
>
> It's fairly straight-forward to calculate the minimum amount of
> power required based on the nominal flow rate and the diameter of
> the meter (as well as the density of air).
>
> Typical peak flow meter velocities are around 60 m/s (IIRC).  For an
> 80mm diameter meter that gives about 0.3 m^3/s. (btw that is about
> what a "5-litre" engine ideally flows at 8000 rpm)
>
> Air at that velocity has a K.E. of about 2.2 kJ/m^3. So the minimum
> amount of drive power required will be 650 W; with perfect blower or
> compressor and no flow losses. Allow for inefficiencies and your
> drive power, wherever it comes from, will have to be much greater.
>
> --
> /"\ Bernd Felsche - Innovative Reckoning, Perth, Western Australia
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