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Film cooling of a turbine blade works by

  • A.Coating the blade with ceramic
  • B.Spraying fuel over the surface
  • C.Air ejected to blanket the surface
  • D.Passing air through internal passages only

Answer: C

The ejected air hugs the surface and insulates the metal from the mainstream gas. It is far more effective than internal convection alone but disturbs the external flow, so each row of holes costs aerodynamic efficiency as well as air.

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