Discussion
Assertion (A): Transonic tunnels use ventilated test-section walls.
Reason (R): Near Mach one a solid-walled tunnel chokes and wall interference becomes severe.
Select the correct answer from the options below.
Answer: D
Both statements are true and the second is the reason for the first. Slots or perforations let the flow spill in or out, relieving the blockage that would otherwise choke the section and cutting the interference. The innovation is what made routine transonic testing possible in the 1950s.
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