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 ?
* Thrust (with PMP): 2,200 pounds dry thrust; 3,300 with afterburners
Toa Kohe-Love was also in determined mood for his new club as he powered over for a double as the Vikings hit the afterburners in the second period.
Young and Gabby were on afterburners the whole game.
No water, high-horsepower fans or afterburners are needed.
a contract to supply ceramic composite nozzle seals for use in afterburners on GE's F414 engine, which powers the U.S.
The author states that the operational life of the engines was degraded because of "excessive afterburning that overheated the engine oil and fused and jammed the bearings." Since when did pisten-engine, propeller-driven aircraft sport an afterburner? Afterburners are for jet aircraft, not the World War II piston engine aircraft.
But not everything about it has the edgy lines, as there are a series of arching bulges, such as not only the fender lines, but also on the side of the vehicle where the tail lamps are fitted: McMahan describes the lights as being like "afterburners," which is part of the American design vocabulary that Chrysler Group is using to define the vehicles that it is producing.
Power Plant: Two Pratts & Whitney F-100-PW-220 or 229 turbofan engines with afterburners Thrust: (C/D models) 23,450 pounds each engine Length: 63 feet, 8 inches Height: 18 feet, 5 inches Wingspan: 42 feet, 8 inches Speed: 1,875 mph Ceiling: 65,000 feet Maximum Takeoff Weight: (C/D models) 68,000 pounds Range: 3,450 miles (3,000 nautical miles) ferry range with conformal fuel tanks and three external fuel tanks Crew: F-15A/C: one.
A line of gas fired afterburners, designed to protect the environment by reducing the amount of VOCs and/or smoke released into the atmosphere, is available from the company.
Existing cupolas would need to achieve 0.005 grains/dry standard cu ft of air (gr/dscf), run afterburners at 1300F (704C) and have an afterburner ramp up time of 30 min or however long the blast was off (whichever is shorter).
Lieutenant (jg) David Rash was especially impressed with the performance of the Fulcrum: "I had a MiG right where I wanted him in a really slow airspeed fight when I saw him light his afterburners and accelerate straight up away from me--amazing!"
'The afterburners that propelled several years of consistently high growth rates now suddenly seem to have been switched off.