### Subject: How to estimate air flow &velocity thru a rotating ram air scoop

Date: Sat Jan 10 00:50:19 2004
Posted by Leonard
City: Galena State/Province: Illinois Country: USA
Area of science: Engineering
ID: 1073717419.Eg
Message:
```
Major  factors  to  consider  when  estimating  how  much (room-temp/68F)  air
will  be  passing through  a  rotating  (500 rpm) cylinder with 4 inch diameter
and  2 inch height. A rotating  ram  air scoop  end-positioned on the top
plate/disc forces  air  down  into  cylinder  body.  Hood scoop  has
3/4  inch  height  and 1-1/2 inch (1.5)  width. Mouth  of  hood is
rectangular.  Slant  angle  of  hood's air  impacting plate  is  to  be
adjusted  for  maximum  air flow.  QUESTION:  Best  angle(s) to  consider?
A scoop with an appropriately-curved  air  impacting back-plate form is  also
feasible  for application.
In  one desirable  form, a similar but REVERSE facing/oppositely positioned
air  scavenging  hood  co-operates  to  pull slightly-compresed air that  was
forced  into  cylinder up  and  out  of said  cup-like  body.  QUESTION;   To
ESTIMATE  (say +/-10%)  air  flow,  velocities,  and  pressures,  what  are
the  most  important  factors  I  must include?
QUESTION;  What  is  the  most  simple/straight-forward  formula  I  can use to
estimate  air  flow rate, pressures,  velocities?
QUESTION;  If  the  scavenging/reverse-pointing hood is  removed  and  a 3/4
by 1 1/2 inch  HOLE  in  the  cylinder's  end plate substitutes, are
calculations/variables greatly  simplified?   What  does formula  then
become?   Lastly,  cylinder  end  opposite  scoop and  exhaust opening is

```

Re: How to estimate air flow &velocity thru a rotating ram air scoop

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