engine exhaust and reverser systems Flashcards
how are high temperature noxious gases removed and disposed of in an operating reciprocating engine
by the engine exhaust system
what is the primary function of an exhaust system (in regard to saftey)
to provide protection against the potentially destructive action of exhaust gases
what are two types of reciprocating engine exhaust systems
the short stack system and the collector system
what type of exhaust system is used on turbocharged engines
the collector system
what material is typically used to make exhaust system muffler shrouds
stainless steel
what drawback in using collector-type exhaust systems is more than offset when used on turbocharged engines
the loss of horsepower due to exhaust system back pressure
why is exhaust system failure considered a severe hazard
it can result in carbon monoxide poisoning, loss of engine power, or fire
why should lead, zinc, or galvanized marks not be made on exhaust systems?
the marks cause a change in molecular structure when heated ad will cause cracks
what is an indication of an exhaust gas leak
flat gray or a sooty black deposit in the area of the leak
how are exhaust system internal baffles of diffusers inspected
the exhaust system is disassembled as necessary for visual inspection
how can failure of exhaust system internal baffles or diffusers cause a loss of engine power
by restricting the flow of exhaust gasses
what happens to engine power when a heat exchanger leaks exhaust gasses into the engine induction system?
loss of power
where are exhaust manifold and stack failures usually found
at welded or clamped points, and flanges
what is a common cause of turbocharger waste gate sticking
coke deposits or carbon buildup
why are turbocharged exhaust system leaks very damaging at high altitudes
pressure differential will cause the leak to escape with torch-like intensity
what are exhaust system coke deposits
excessive carbon buildup
what happens to turbine engine performance if the exhaust nozzle area is changed
the performance and engine gas temperature change
what are the components of a typical turbine exhaust nozzle
a tail cone, exhaust duct, and support struts
what is the function of the thermocouple probes in a turbine exhaust pipe
to measure exhaust gas temperature
what change does noise suppressor make to noise frequency in order to help reduce older turbojet engine noise
it converts low frequency sound into high frequency sound
what are thrust reversers primarily used for
to aid in decelerating an aircraft after landing
name two types of thrust reverser systems commonly used
mechanical blockage (clamshell),
aerodynamic blockage ( cascade)
what are hazards of operating some thrust reversers at low ground speeds
- re-ingestion of hot exhaust gases
- ingestion of foreign objects stirred up by the deflected exhaust gases
are thrust reversers generally able to produce maximum reverse thrust approximately equal to an engine’s full forward thrust
no. an engines full reverse thrust is usually substantially less than its full forward thrust
