The design and experimental study of a combined pilot flameholder is presented for a turbofan engine afterburner with an annular mixer.The combined pilot flameholder is composed of a main ingestion gutter ring with corrugated slots and radial finger gutters with ingestion holes.The two dimensional and double stream flow visualization tests of its reduced scale model demonstrate the flow pattern hehind the flameholder,and also reveal the reason,why the annular pilot burner can ignite and support the bypass flow flame.Its sector rig tests and engine bed tests show that the afferburners with this kind of flameholder possess enhaneed combustion efficiency,improved combustion stability and reduced pressure loss at both normal and low pressures.
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