Discussion
A tunnel has a contraction ratio of \( 9 \) to 1. If the settling chamber velocity is \( 6 \) m/s, the test-section velocity is
Answer: B
Continuity for an incompressible flow gives the velocity ratio as the area ratio, so \( 6 \times 9 = 54 \) m/s. The large contraction is chosen for flow quality rather than speed: it lowers the turbulence intensity relative to the mean velocity as it accelerates the stream.
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