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A tunnel's energy ratio expresses

  • A.Test-section kinetic energy over drive power
  • B.Model drag divided by lift
  • C.Test-section area divided by settling chamber area
  • D.Reynolds number divided by Mach number

Answer: A

The ratio measures how efficiently the circuit converts shaft power into kinetic energy at the model, and values well above one are normal for a good closed-circuit tunnel because the air is recirculated. It is the figure of merit used when comparing tunnel designs.

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