What Is the Formulation for Wind Tunnel Blockage Ratio?

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The blockage ratio in a wind tunnel is defined as the percentage of the test section area that is obstructed by the model, calculated by dividing the frontal area of the model by the cross-sectional area of the tunnel. For an experimental study with an aspect ratio (AR) of 5, the specific blockage ratio can be determined using this formula. The book "Low Speed Wind Tunnel Testing" by Pope provides detailed insights into these calculations. Understanding the blockage ratio is crucial for accurate experimental results in wind tunnel testing. Properly accounting for this ratio ensures reliable aerodynamic data.
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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...
 
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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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