How can i calculate the velocity in a wind tunnel

[MattH150197]

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.

 

[boneh3ad]

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?

 

[MattH150197]

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.

 

[MattH150197]

This is a diagram showing the location of the pressure readings.

 

[boneh3ad]

Two pressures will give you a velocity difference. Use continuity to relate the two velocities assuming you know the contraction ratio.

 

[MattH150197]

Ah yeah of course, thank you very much!