Induction Systems Flashcards
Name the three components of the induction system of a reciprocating engine
The air scoop, the carburetor or fuel control and the intake manifold
What could happen if an induction system becomes obstructed?
The engine may not be able to produce its rated power or it may not run at all. This may also be an indication of a dirty air filter
How does induction icing affect engine performance?
It causes a reduction in power and possible erratic operation
How is induction icing categorized?
As impact ice, fuel evaporation ice and throttle ice
What is the common method used to prevent induction system ice in a reciprocating engine?
Raise the temperature of induction air with a preheater
What causes fuel evaporation ice?
Fuel evaporation ice is formed because of a decrease in air temperature caused by the evaporation of fuel after it is introduced into the airstream
Is carburetor throttle ice more likely to occur at a higher or lower power setting and why?
At a lower power setting because the throttle is partly closed, offering a larger surface area for ice accumulation
What may be an indication of leaking intake pipes?
The engine runs rough at low rpm
What happens to engine power when carburetor heat is applied?
There is a noticeable drop in power
What could happen if carburetor heat is applied at high engine power settings?
Detonation
What are two types of supercharged induction systems?
Internally driven and externally driven
How and at what point does an internally driven supercharger boost air pressure?
An engine driven impeller compresses the fuel air mixture after it leaves the carburetor
What is used to power a turbocharger?
Engine exhaust gas directed onto the turbocharger turbine
What could result if the waste gate on a turbocharger system does not close fully?
The engine may not be able to produce its rated power at certain altitudes and the aircraft may not be capable of reaching critical altitude
What function does a turbocharger waste gate perform?
It controls the amount of exhaust gas either into or around the turbocharger, thus controlling the boost pressure of the turbocharger
What could cause a turbocharged engine to surge?
There could be a waste gate or controller malfunction
What are the most common ways to control a waste gate?
Either mechanically with linkages to the throttle or a separate control or by an actuator that is driven by oil pressure
In a pressurized, reciprocating aircraft, what component in the turbocharger system is used to limit the amount of turbocharger airflow used for cabin pressurization?
The sonic venturi
What is the function of a divergent shaped jet engine inlet during subsonic flight?
It causes the air velocity to decrease with an increase in air pressure
Where are bell-mouth inlet ducts typically found?
On helicopter engines
How do Venturi type particle separators found on many turbine-powered helicopters function?
A Venturi is used to accelerate the flow of incoming air and debris through a curved intake. The debris gains too much inertia to allow it to follow the curved intake toward the engine and is channeled away from the compressor
What are the most common methods used for anti-icing of a turbo engine inlet duct?
Engine bleed air and electric heating elements
