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Tractorsport Flowbench Forum Archive • View topic - Annubar bench design

Annubar bench design

Pitot Style Bench discussions

Postby turbodig » Wed Nov 24, 2004 4:34 pm

Hi,

I'm planning an annubar bench, and was wondering about a
couple things... (Crude drawing shown below)

Image


Regarding the flow straighteners, is it better to have them
closer to the annubar or like I have them in the pic?

I'm essentially using the box as a plenum, and it has a
fair amount of volume. I'm hoping it won't be too much volume
to pull a good depression? (using 4 Ametek vacuum motors)

I've also found some Freescale 5v differential pressure senders
that do a 1.45 PSI range. Gonna try them with my Labjack DAC
system to try to calculate airflow on the fly. Step 2 is to use the
Labjack to control motor speed to keep the depression constant,
but I'm trying to limit myself to one project at a time.. :)

Thanks,

Dig
turbodig
 
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Postby bruce » Thu Nov 25, 2004 11:33 am

I wouldn't see why this would not work. I personally don't like the large plenum and then the flow going into the pipe, but thats just my thoughts and should not sway you in your design. I'm finding there are more than one way to measure airflow . . .
"There is no more formidable adversary than one who perceives he has nothing to lose." - Gen. George S. Patton
bruce
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Postby 84-1074663779 » Thu Nov 25, 2004 5:29 pm

Agree with Bruce, it looks o/k and should work.

How about fitting a large gently flared entry from the plenum into the flow straightener ? This will gather and accelerate the air and point it in the right direction. Otherwise there might be a fairly high pressure drop where the air tries to enter the flow straightener.

In theory an exponential horn will give constant acceleration to the air over its length. Something like a musical instrument flare shape.

:D
84-1074663779
 

Postby turbodig » Wed Dec 01, 2004 11:50 am

turbodig
 
Posts: 8
Joined: Tue Nov 23, 2004 7:02 pm
Location: Sabin, MN, USA


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