Discussion
A closed-circuit tunnel delivers \( 900 \) kW of kinetic energy flow at the test section for \( 300 \) kW of drive power. Its energy ratio is
Answer: B
The ratio is \( 900/300 = 3.0 \). Values above one are possible because the air is recirculated and only the circuit losses need to be made up each pass, which is the principal economic argument for a closed-circuit layout.
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