Engine exhaust systems: Recip. and Turbine Flashcards
Approximately __________ percent of the heat energy in fuel burned is lost out the exhaust system.
50
Two problems caused be short exhaust stacks are
__________
__________
Excessive nose
Exhaust valve warpage
The large pipe into which all exhaust gases from a radial engine flow is called a/an __________.
Collector ring
The name of the exhaust system component through which exhaust gases leave the aircraft is the __________.
Tail pipe
Two uses for some of the heat taken from exhaust gasses are:
cabin heat
carburetor heat
Flexible ducting used for carrying the heated air from the shroud around the muffler to the carburetor heat box is __________ (red/black)
Red
The stainless-steel tube through which some of the exhaust gases pass after leaving the tail pipe is called a/an __________ tube,
Augmenter
Two devices used to recover some of the energy from exhaust gasses are:
__________
__________
Turbochargers
Power recovery turbines
Two methods of allowing exhaust system components to move relative to each other without leaking exhaust gases are:
__________
__________
Slip joints
Metal bellows
Energy extracted from exhaust gases by a power recovery turbine is coupled to the crankshaft through a ____________.
Fluid coupling
An exhaust system component must be protected from marks made by galvanized metal because the __________ deposits will defuse into the metal and cause cracking
Zinc
Exhaust systems must never be marked with a lead pencil because the _________ in the pencil mark will diffuse into the metal and cause cracking
Carbon
The air pressure used to pressure-check an exhaust system for leaks may be produced with the use of a/an __________.
Vacuum cleaner
Carbon monoxide detectors are packets of chemical crystals that change __________ in the presence of CO
color
The most common type of exhaust duct for the smaller turbojet and turbofan engines is a _________ duct.
Convergent
The exhaust cone is considered to be an __________ component
Engine
Exhaust gasses leave the exhaust nozzle in most turbojet and low-bypass turbofan engines at the speed of __________
sound
A convergent-divergent exhaust nozzle increases the thrust produced at supersonic flights by increasing the __________ of exhaust gases.
Velocity
Exhaust gases enter a CD nozzle at a __________ speed
Subsonic
In a CD nozzle that uses two sets of overlapping flaps to control gases as they leave an afterburner duct, the flaps are actuated hydraulicly and they are controlled by the___________.
Eletric Engine Control (EEC)
A CD inlet duct and a CD exhaust nozzle serve a __________ function
Diferent
Ture or False.
A noise suppressor used on a turbojet engine exhaust system decreases the total amount of sound the engine produces.
False
The amount of noise a turbojet produces is related to the _________ of the exhaust gases
Velocity
Low-frequency sound waves travel a __________ distance through the air than high-frequency wave
Greater
Two reasons a turbofan engine produces less noise than a turbojet engine is:
__________
__________
The fan extracts extra energy from the exhaust gases
The exhaust gas velocities are lower
A thrust reverser installed on a turbojet or turbofan engine produces a forward thrust that is between _________ and __________ percent of the engines rated forward thrust
40
50
Two types of thrust reversers are those that use __________ doors and ___________ vaines
Clamshell
Cascade
Thrust reversers are most effective on the ground when the speed is __________
High
An afterburner is used on a supersonic commercial transport to decrease the time needed for the aircraft t reach its __________
Cruising altitude
When the afterburner is being used, the area of the exhaust nozzle is __________
Increased
The engine in a harrier jet produces a component of vertical thrust by vectoring the __________
Engine exhaust
An augmented tube increases the flow of cooling through the engine cylinder fins because of low pressure caused by the high velocity___________ gases that flow through the tube
Exhaust
