Afterburner

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afterburner

[′af·tər‚bər·nər]
(aerospace engineering)
A device for augmenting the thrust of a jet engine by burning additional fuel in the uncombined oxygen in the gases from the turbine.

Afterburner

 

a secondary combustion chamber in certain turbojet engines that is used to augment the engine thrust for a short time (see). An engine equipped with an afterburner is called an afterburning engine.

An afterburner is situated between the turbine and the jet nozzle of a turbojet engine or a dual-cycle engine. The gas that leaves the turbine still contains much oxygen; in a turbojet engine, this gas alone enters the diffuser of the afterburner. In a dual-cycle engine, a mixture of the gas that leaves the turbine and air from a bypass duct enters the diffuser. The speed of the gas flow is reduced in the diffuser, and fuel—usually aviation kerosene—is then injected into the flow. When the fuel is burned in the afterburner, the temperature rises and the exhaust jet velocity increases.

Figure 1. Diagram of an afterburner: (1) diffuser, (2) fuel nozzles, (3) flameholders, (4) lining, (5) engine housing, (6) precombustion chamber

Flameholders are used so that the combustion process occurs over the shortest possible distance. A liner is employed to shield the walls of the afterburner. The afterburner is started by a flame from a precombustion chamber (see Figure 1).

Afterburners may also be used to boost the power of free-piston engines.

References in periodicals archive ?
In a survey of melting furnaces, most cupolas use a combination of an afterburner with a fabric filter or wet scrubber.
In this area, the afterburners seethe during a variety of 7th Fleet exercises: Tandem Thrust, Valiant Blitz, Keen Edge and RIMPAC being some of the larger ones.
I saw the flap light transition from green to amber as the airspeed fell from my scan with afterburners fully staged.
It also can be used for sealing housings and pipes or to repair other high-temperature equipment like afterburners or exhaust pipes.
Emitting a thin plume of vapor - and roaring like a military jet in afterburners - the craft lifted off and climbed in a looping curve.
I kept my eyes on the lead, lit the afterburners, and nosed the plane over.
Cupolas--These furnaces may require afterburners working at 1300F (705C);
features the firing of afterburners and pyrotechnics after dark.
Guest speakers, the Afterburners, will close out the conference with their unique perspective on how to apply strategies used by fighter pilots to successfully execute missions in the business world.
Running smoothly, and well out in front, Greene downshifted into cruise mode 150 meters into the race, only to have to reignite the afterburners when threatened by Ramon Clay and Darvis Patton.