Intake runner sizing..

[Bruce Bowling]

~ 
~ > 
~ > Variable intake length would be fun - could you have the butterflys in a
~ > fixed position and use variable length trumpets, or do you mean variable
~ > length by changing it with several butterflys to turn on/off extra
~ > tubing. Hmm.. so if I had 4 feet of tube would the torque peak be at
~ > idle?? :-) (It's an automatic).
~ 
~ 
~ 
I have the following equations for computing harmonic frequencies, which
I obtained from a SuperFlow flow bench manual:

In the following, L = runner length in inches....

2nd harmonic ranges from 117480/L to 142560/L, with a pulse strength of 10 percent.

3rd harmonic ranges from 88270/L to 100880/L, with a pulse strength of 7 percent.

4th harmonic ranges from 68820/L to 76960/L, with a pulse strength of 4 percent.

I am sure these are empirically-derived, so be warned..................

- Bruce

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               Bruce A. Bowling
  Staff Scientist - Instrumentation and Controls
 The Continuous Electron Beam Accelerator Facility
    12000 Jefferson Ave - Newport News, VA 23602
                 (804) 249-7240
                bowling at cebaf.gov  
        http://devserve.cebaf.gov/~bowling
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