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Weak extinction of a combustor occurs when

  • A.The mixture becomes too lean to sustain a flame
  • B.The mixture becomes too rich
  • C.The pressure becomes too high
  • D.The fuel temperature is too low

Answer: A

Below a limiting fuel-air ratio the heat released cannot keep the recirculating products hot enough to reignite the incoming mixture. Rapid deceleration is the classic cause, which is why fuel controls schedule the reduction rather than allowing an instant cut.

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