Induction and engine airflow systems Flashcards
(30 cards)
What happens to engine power when carburetor heat is applied?
There is a noticeable drop in power
What could happen if a carburetor heat is applied at high engine power settings?
Detonation
What could happen if the induction system becomes obstructed?
The engine may not be able to produce its rated power, or it may not run at all. This can also be an indication of a dirty air inlet filter.
Name the three induction system components of a reciprocating engine
Air scoop
Carburetor or fuel control
Intake manifold
What is a 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?
A decrease in air temperature, resulting from evaporation of the fuel after it is introduced into the airstream
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
Is carburetor throttle ice more likely to occur at a higher or lower power setting?
Lower. The throttle is partly closed, offering a larger surface area for the ice accumulation.
What may be the indication of leaking intake pipes?
The engine runs rough at low RPM
What are the two types of supercharged induction systems?
Internally driven
Externally driven
How and at what point does an internally driven supercharger, boost air pressure?
An impeller compresses the fuel/air mixture after it leaves the carburetor
From where does an externally driven supercharger derive its power?
Energy from exhaust gases that are directed against a turbine
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 into the turbo charger turbine
What is the function of a turbocharger wastegate?
It controls the volume of exhaust gas that is directed onto the turbine
What could result if the wastegate on a Turbo charger system does not close fully?
The engine may not be able to produce its rated power at certain altitudes and/or the aircraft may not be capable of reaching critical altitude
What could cause a turbo charged engine to surge?
A wastegate or controller malfunction
What are the most common ways to control a wastegate actuator power?
Mechanically with links attached to the throttle or a separate control
Hydraulically by an actuator that is driven by oil pressure
What is used on many turbocharged engines for wastegate actuator power?
Oil pressure
In a pressurized reciprocating aircraft, what component in the turbocharger system is used to limit the amount of turbo charger airflow used for a cabin pressurization?
The sonic Venturi
What is the function of a divergent shaped jet engine in lit 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
What is the function of a sonic Venturi in Turbo charger systems?
To limit the amount of turbo charger airflow used for cabin pressurization
