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Cooling air for turbine blades is taken from

  • A.The exhaust after the turbine
  • B.Ambient air through the nacelle
  • C.The compressor, bypassing the combustor
  • D.The bypass duct only

Answer: C

That air has been compressed and then never heated, so the work spent on it is largely wasted. Cooling flows of fifteen to twenty per cent of core airflow are typical, and reducing them is a standing objective in turbine development.

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