Discussion
A blowdown tunnel holds \( 20 \) m\( ^3 \) of air at \( 20 \) bar and consumes \( 8 \) m\( ^3 \) of stored air per second at test conditions. Its run time is about
Answer: B
The stored volume at test conditions is \( 20 \times 20 = 400 \) m\( ^3 \), so at \( 8 \) m\( ^3 \) per second the run lasts about 50 s, less the margin needed to hold conditions steady. Short run times are the defining constraint of the blowdown layout.
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