1 Flashcards
(29 cards)
The temperature of the gas entering the exhaust system is between (?) according to the type of engine and with the use of afterburning can be 1,500 deg C or higher.
550 and 850 deg C
The temperature of the gas entering the exhaust system is between 550 and 850 deg C according to the type of engine and with the use of afterburning can be (?) or higher.
1,500 deg C
Most aircraft utilize (?) to aid the brakes during landing.
thrust reversers
The (?) collects the exhaust gases discharged from the turbine section and gradually converts them into a solid flow of gases. In performing this, the velocity of the gases is decreased slightly and the pressure increased.
exhaust cone
tail pipe or ?
jet pipe
The (?) is usually constructed so that it is semiflexible. On some tailpipes, a bellows arrangement is incorporated in its construction, allowing movement in installation, maintenance, and in thermal expansion. This eliminates stress and warping which would otherwise be present.
tailpipe
It is a duct attached to the rear of the engine which the exhaust gases are discharged.
Tailpipe
? usually consist of layers of aluminum foil separated by a fiberglass layer. These primarily reduce heat loss in the exhaus system and protect the fuselage from heat radiation.
Insulation Blanket
Exhaust nozzle or ?
propelling nozzle
The (?) is the final section of the exhaust system.
exhaust nozzle or the propelling nozzle
3 Types of Propelling Nozzles
Divergent
Convergent
Combination
There are two types of exhaust nozzle designs: the (?) for subsonic gas velocities and the (?) for supersonic gas velocities.
converging design
converging-diverging design
The exhaust cone area (?) the air from the turbine
diffuses
Gas from the engine turbine enters the exhaust system at velocities from (?), but, because velocities of this order produce high friction losses, the speed of flow is decreased by diffusion.
750 to 1,200 feet per second
The exhaust system must be capable of withstanding the high gas temperatures and is therefore manufactured from (?). It is also necessary to prevent any heat being transferred to the surrounding aircraft structure.
nickel or titanium
Sources of Engine Noises
Exhaust
Turbine
Compressor and/or Front Fan
(?) is an externally generated source, which radiates in a rearward direction. It is caused by the mixing process of the high-speeq exhaust gases with the surrounding air.
Jet noise
(?) is created from the mixing of atmospheric air and the exhaust gases.
Exhaust jet noise
A (?) engine has a higher turbine and exhaust jet oise than the high bypass ratio engines.
low by-pass ratio
2 Turbine Noises
White Noise
Discrete Noise
Random or Background noise is caused by the reaction of each blade to the passage of air over its surface. There will always be noise from eddy shedding in the blade wake reacting back on the blade and causing random fluctuations over the blade surface (this source of noise may be likened to that produced by opening the quarter-light window on a Car).
White Noise
The (?) from the engine depends on the area of the turbine section. Therefore, in every engine it would be of different intensity.
discrete noise
The (?) from the engine depends on the area of the turbine section. Therefore, in every engine it would be of different intensity.
discrete noise
The pure jet engine and/or low by-pass engines are noisier than that of the (?).
high by-pass engines
