In gas turbine annular combustors, recirculating primary zone aerodynamic recirculation is induced by swirl vanes primarily to:

(A) Create a low-velocity toroidal recirculation vortex that anchors the flame and provides continuous ignition

(B) Suppress all soot emissions by chilling the flame below 500 K

(C) Accelerate the combustion gas to supersonic speeds before the turbine guide vanes

(D) Condense water vapor to prevent blade oxidation

Answer Key:

A

### Solution: Swirler vanes create a central toroidal recirculation zone with reverse axial flow that brings hot combustion products into continuous contact with freshly injected fuel/air mixture, anchoring the flame against blowout. Correct: A.

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