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During a rapid deceleration the flame in a combustor extinguishes although the fuel supply has not been shut off completely.

What has occurred and how is it prevented?

  • A.Igniter failure, prevented by continuous ignition
  • B.Weak extinction, prevented by scheduling the deceleration
  • C.Rich extinction, prevented by adding fuel faster
  • D.Compressor surge, prevented by bleed valves

Answer: B

A sudden reduction takes the mixture below the limit that sustains combustion, so the recirculating products cool below the reignition temperature. Fuel controls schedule deceleration for exactly the same reason they schedule acceleration.

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