How can i calculate the velocity in a wind tunnel

  • #1
MattH150197
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Ive done some wind tunnel experiments for a wing design i made, the wind tunnel was set to 50% power and the incidence angle was increased from -2 to 14 at 2 deg increments, how do i calculate the velocity for each recording? I've done this before but I am just having a mental block on remembering how to calculate the velocity as i haven't done any wind tunnel experiments in a couple of years. The recordings i took were: wind tunnel temp at the time of each recording, the Betz pressure reading of the wind tunnel for each recording and the atmospheric pressure of the lab room.
 

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  • #2
boneh3ad
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I operate wind tunnel for a living and I don't know what a Betz pressure reading is.

Did you not employ a Pitot probe of any kind?
 
  • #3
MattH150197
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I operate wind tunnel for a living and I don't know what a Betz pressure reading is.

Did you not employ a Pitot probe of any kind?
Sorry should have given the full name, betz manometer pressure readings, I think they it does a similar job as a pitot tube but is just cheaper for installation.
 
  • #4
MattH150197
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This is a diagram showing the location of the pressure readings.
 

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  • #5
boneh3ad
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Two pressures will give you a velocity difference. Use continuity to relate the two velocities assuming you know the contraction ratio.
 
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  • #6
MattH150197
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Ah yeah of course, thank you very much!
 

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