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 ?
Well, we only see two viable options at this time: Thermal afterburners that reduce emissions through elevating the effluent to 1400 [degrees]F, or catalytic converters that still require effluent temperature elevation to 600 [degrees]F, however, then rely on a chemical reaction to complete reduction of hydrocarbons.
Following the keynote address the audience will have the chance to stay and participate in "Leaning Forward with the AfterBurners," a high-energy and fast-paced team-building event where attendees will use a flight simulator as part of their learning experience.
In addition to thermal oxidizers (afterburners that operate around 1400[degrees]F), and catalytic oxidizers (more efficient afterburners that operate at about 800[degrees]F, thus using less fuel,) Probat now offers their "FRTO," the Flameless Regenerative Thermal Oxidation unit.
Scrap preheaters--These systems may require direct flame impingement or afterburners to heat to 800F (427C);
This is the third consecutive year we've had an evening show,'' said Reid, who described afterburners as what happens when pilots take their engines to full throttle, sparking fire that comes shooting out of the planes.
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.
wet scrubbers and baghouses are the most commonly used devices for removing particulate from cupola exhaust gas, and typical efficiencies for removing particulates in baghouses exceeds 99%, with scrubbers and afterburners removing 95%;
A freeboard zone is incorporated to retain the exhaust gases at the required temperature, achieving complete combustion and emission control without the need for afterburners.
Stealthy and able to cruise at faster than the speed of sound without using fuel-guzzling afterburners, the F-22 would protect bombers, attack jets and ground troops by clearing the skies of enemy fighters.
With no federal requirement for afterburners, some state environmental agencies are putting roasters under fire while others are not.
Any change of heart from this grim bunch could spark the afterburners for NWAC and send it soaring higher.