Induction Systems Flashcards
Name the three components of the induction system of a reciprocating engine:
The air scoop.
Carburetor or fuel control.
The intake manifold.
What could happen if the induction system becomes obstructed?
Engine may not be able to produce it’s rated power or run at all.
How does induction icing affect engine performance?
It causes a reduction in power and possible erratic operation.
How is induction icing categorized?
Impact ice.
Fuel evaporation ice.
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 pre-heater.
What causes fuel evaporation ice?
The decrease in air temperature resulting from evaporation of the fuel, after it is introduced into the air system.
Is carburetor throttle ice more likely to occur at a higher or lower power setting? 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 RPMs.
What happens to engine power when the 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.
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 turbo charger?
Engine exhaust gas directed onto the turbo charger turbine.
What could result if the wastegate on a turbo charger system does not fully close?
The engine may not be able to produce it’s rated power at certain altitudes, and the aircraft may not be capable of reaching critical altitude.
What function does a Turbocharger wastegate perform?
It controls the amount of exhaust gas either into or around the turbo charger.
What could cause a turbo charged engine to surge?
A waste gate or controller malfunction.
What are the most common ways to control the 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 a subsequent increase in air pressure.
Where are bellmouth 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 towards the engine.
What are the most common methods used for anti-icing of turbine engine inlet ducts?
Engine bleed air.
Electric heating elements.
