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The overall air-fuel ratio of a gas turbine combustor is typically about

  • A.150 to 1
  • B.60 to 1, far leaner than stoichiometric
  • C.15 to 1, near stoichiometric
  • D.5 to 1, rich

Answer: B

Stoichiometric for kerosene is close to 15 to 1, so the overall chamber runs roughly four times leaner. Only the primary zone burns near stoichiometric, and the remaining air cools the walls and dilutes the products afterwards.

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