Discussion
Consider the following statements about a blowdown tunnel:
1. It runs for a limited time from a charged reservoir.
2. Conditions drift as the reservoir empties.
3. It costs more to build than a continuous tunnel of the same performance.
Which of the statements given above is or are correct?
Answer: C
The first two are correct and describe both the appeal and the drawback. The third is reversed: the low capital cost is precisely why blowdown facilities are so widespread, since a continuous tunnel of the same Mach and Reynolds capability would be far more expensive.
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