Discussion
Running a tunnel at \( 4 \) atmospheres instead of \( 1 \) changes the Reynolds number, at fixed speed and size, by a factor of
Answer: D
Density is proportional to pressure at a fixed temperature, and Reynolds number is proportional to density, so the factor is four. Pressurisation is therefore a direct and linear lever, limited only by the cost of the pressure shell and the loads it puts on the model.
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