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Mini windtunnel guidance

  1. Jul 31, 2015 #1
    Hi guys,
    I am really new to the concept of aerodynamics and really need some guidance for my university project.
    First of all, I am going to make a DIY windtunnel based on this project http://www.instructables.com/id/DIY-Wind-Tunnel-20-Project-Paperclip/

    The size of the testing section needs to be 60cm x 60cm (or 24" x 24"). I am aiming to achieve a windspeed approximately at 10-20 m/s. So my question is what kind of fan do I need? Would I need some thing like an industrial fan such as this: http://www.bunnings.com.au/dynabreeze-60cm-blue-industrial-drum-fan_p4440780

    Or should i make some thing like this so I can control the fan speed with PWM :

    So for a 120mm fan, the flow rate is usually between 50~75 CFM. I have no idea how to convert this to m/s and if I use 25 fans, would this mean I just need to add the CFM together?

    I am afraid that the industrial maybe too strong and the PC fan box may not be strong enough. Please give me some guidance.

    Thank you for your time and help :)
  2. jcsd
  3. Jul 31, 2015 #2


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    Science Advisor
    Gold Member

    You really need to learn at least some basic fluid mechanics before starting this project .

    To start you off though :

    Volume flow through a hole is (air velocity) * (cross sectional area) - just for rough sums anyway .

    Detailed calculation is a bit more complicated but not nescessary for your purpose .

    Work in consistent units .
  4. Jul 31, 2015 #3


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    Staff: Mentor

    Welcome to the PF.

    Here is a recent PF thread about wind tunnels -- it may help to give you some ideas and start to understand some of the calculations involved:


  5. Aug 3, 2015 #4
    Thank you guys, I'll do more research :)
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