Discussion
Consider the following statements about test-section blockage:
1. It causes the measured forces to come out too high if uncorrected.
2. Frontal area is usually kept below about five per cent of the section area.
3. It can be ignored entirely if the model is well streamlined.
Which of the statements given above is or are correct?
Answer: D
The first two are correct. The third is false: solid blockage depends on the volume the model occupies whatever its shape, so even a streamlined model displaces flow and speeds up the surrounding air. Streamlining reduces the wake blockage term, not the solid one.
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