I don't think that Aircraft Engines have Silencers, do they?

Answer 1

Not really. Piston engined aircraft do occasionally have "mufflers" which probably reduces the noise a bit but the main function is usually to direct the exhaust in the desired direction or reduce the glow of the exhaust at night when it might interfere with the pilot's vision.

In jet aircraft the exhaust itself is both the source or propulsive power and engine noise and any attempt to reduce noise is also likely to reduce thrust.

Therefore noise reduction is more a matter of designing the engine to make less noise from the outset. Modern jet engines may have a high by-pass ratio which means more intake air passes "along the side" of the engine to the combustion chamber rather than through the central engine core. This helps in noise reduction.

The eliminaton of certain noise frequencies which are particularly intrusive means that overall noise may not be reduced but the impact of the noise is lessened.

As engines become more powerful and reliable, many airliners have only two larger engines (eg turbofans) which produce less noise. These generate more thrust than, say three or four older engines but do not generate as much noise. In this way a modern 2-engined aircraft of a given carrying capacity may only generate, say, half as much noise as an older 3-or 4-engined aircraft of comparative capacity.

For military engines noise is obviously a lesser consideration (although stealth requirements may change this somewhat). Nevertheless, the development of engines which generate more dry thrust (ie without using afterburning) means that engines now exist which, relative to their thrust, produce much less noise.

Finally there are procedural methods of reducing noise in areas where this can be most intrusive - for example delaying major throttle adjustments until clear of built-up areas or using approach routes which take the aircraft over lesser-populated areas.

Answer 2

Two examples of aircraft with "silenced" engines would be the F-117 and the B-2 bombers. They both have their jet engines set inside the airframe and exhausting into a thin diffuser to dampen their noise signature. Both aircraft make signifigant compromises to reduce their radar cross section and potential for detection by enemy forces.

Civilian aircraft are subject to speed restrictions and areas of operation to reduce noise to those on the ground.

Answer 3

No, they do not have silencers, a turbofan is normally quieter due to its construction, a turbojet is louder...but that's not the issue. The jet engines are not as fuel efficient, fitting a silencer would reduce efficiency further. Regarding propeller driven craft , same reason applies. Since there are far fewer aircraft than cars, guess we manage to live with it......

Answer 4

Purpose of silencer = ?
Why sound is generated in engine =?
Does exhaust system carries all the sound generated = ?
Silencer is a must in any engine, otherwise sound waves will shall break the system.

Answer 5

Yes they have but only to reduce internal noise of the engine..... Today most of the planes use jet engine.so when the air comes out it makes a lot of noise....

Answer 6

No. There are ways of flying to reduce noise on the ground.

Answer 7

no but if they fly faster than mach 1 then the plane reaches its target before the sound.

Answer 8

DO YOU THINK THEY NEED ONE!!!!!!!!!!