Discussion
Consider the following statements about closed-circuit wind tunnels:
1. They need less drive power than an open tunnel of the same test section.
2. They give better control of flow quality.
3. They are cheaper to build than an open tunnel.
Which of the statements given above is or are correct?
Answer: A
The first two are the reasons closed circuits are preferred for serious work. The third is the wrong way round: the return duct, corner vanes and larger building make them substantially more expensive, which is precisely why open-circuit tunnels remain common in teaching laboratories.
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