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Film cooling of a flame tube works by

  • A.Radiating heat to the casing
  • B.Spraying water onto the wall
  • C.Air admitted along the wall
  • D.Circulating fuel through passages in the wall

Answer: C

A thin layer of relatively cool air is introduced through rows of slots and hugs the wall, keeping the flame off the metal. Effusion cooling achieves the same end through many small holes and uses less air, which matters as turbine entry temperatures rise.

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