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Calculation of blockage ratio?

  1. Mar 17, 2014 #1

    hmd

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    Hello, i am asking a question:
    is there any formulation of wind tunnel blockage ratio? i will carry out experimental study in a wind tunnel, the aspect ratio (AR)=5, and what equals the blockage ratio?


    if someone helps me, i will be very happy :)


    thank you...
     
  2. jcsd
  3. Mar 20, 2014 #2

    boneh3ad

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    Gold Member

    Do you have a copy of "Low Speed Wind Tunnel Testing" by Pope handy? These kinds of questions are covered in detail in that book. At any rate, the blockage ratio is simply the percentage of the test section that is blocked by the model. In other words, the frontal area of your model over the cross-section of the tunnel.
     
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