Discussion
Consider the following statements about similarity in wind-tunnel testing:
1. Geometric similarity requires the model to have the same shape as the full-scale article.
2. Dynamic similarity requires the governing dimensionless force ratios to match.
3. Matching Reynolds and Mach numbers together is usually straightforward at model scale.
Which of the statements given above is or are correct?
Answer: B
The first two define the requirements correctly. The third is false and is the central practical problem of the subject: a smaller model needs more speed for the Reynolds number, which spoils the Mach number, and escaping that conflict requires changing the fluid instead.
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