Recip Engine Induction & Cooling Systems Flashcards
Where is the heat taken from that is used to heat the induction air in a reciprocating engine?
From a muff that is installed around some part of the exhaust system.
Where does the alternate air come from that is used with a pressure carburetor or a fuel injection system?
From inside the engine cowling.
Where does carburetor ice normally form in a carburetor?
In the throat of the carburetor, on and around the throttle valve.
Does the application of carburetor heat cause the air-fuel mixture to become richer or to become leaner?
Heated air causes the air-fuel mixture to become richer.
What is used to drive most of the external superchargers used on modern reciprocating engines?
Exhaust gases.
What controls the speed of a turbocharger compressor?
The amount of exhaust gas that is forced to flow through the turbine. This is controlled by the position of the waste gate.
What is the danger of operating an aircraft reciprocating engine with too high a carburetor air
temperature?
Too high a carburetor air inlet temperature can cause the air-fuel
mixture to reach its critical temperature and detonate.
What is usually installed in a large reciprocating engine between the turbosupercharger and the carburetor?
An intercooler. This is an air-to-air heat exchanger.
In what position should the carburetor heat control be placed when starting a reciprocating
engine?
In the COLD position.
How does an engine air inlet vortex destroyer help prevent foreign object damage to the engine?
A high-velocity stream of compressor bleed air is blown out in front
of the engine to break up the vortices that form in front of the
engine when it is operating at high power on the ground.
What is meant by pressure cooling of an aircraft engine?
Air cooling in which air is forced to flow through baffles and
cylinder fins by a pressure differential across the engine.
What is the purpose of an augmentor tube in the cooling system of an aircraft reciprocating
engine?
The augmentor tube uses the velocity of the exhaust gases to produce a low pressure on one side of the engine that helps pull cooling air through it.
Where is the highest temperature located in a turbine engine?
At the inlet to the high-pressure turbine.
How are the turbine inlet guide vanes and the first-stage turbine blades in some turbine
engines cooled?
High-pressure compressor bleed air flows through the hollow guide
vanes and hollow turbine blades.
Which side of an air-cooled engine cylinder has the greatest amount of cooling fins?
The side of the cylinder in which the exhaust valve is located.
