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The dilution zone of a combustor exists to

  • A.Complete the combustion of unburnt fuel
  • B.Anchor the flame
  • C.Cool the compressor delivery air
  • D.Reduce the gas temperature to what the turbine can accept

Answer: D

Combustion products leave the primary zone far hotter than any turbine blade could survive, so the remaining air is admitted through dilution holes. Placing those holes correctly also governs the temperature pattern the turbine actually sees.

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