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Flame holders in a ramjet combustor work by

  • A.Increasing the fuel pressure
  • B.Choking the combustor exit
  • C.Creating a recirculation zone
  • D.Cooling the incoming air

Answer: C

A bluff body or a step leaves a sheltered wake in which hot products linger and ignite the oncoming flow. Without such a region the flame would simply be swept downstream even at the reduced subsonic combustor velocity.

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